The Thai Meteorological Department has issued its ninth alert for intense summer storms across upper Thailand, with hazardous conditions forecast until April 20.

The storms are expected to bring heavy rain, strong winds, hail, and lightning to Bangkok and dozens of provinces across the north, northeast, east, and central regions. Moist southern and southeastern winds drawing in from the Gulf of Thailand and the South China Sea are driving the thunderstorms, compounded by the ongoing hot to extremely hot conditions across the region.

Residents are urged to avoid open areas, large trees, unstable structures, and billboards during the storms. Farmers are advised to reinforce crops and take steps to protect livestock and agricultural products from potential damage. Health precautions are also recommended given the rapidly changing conditions.

For updates, residents can visit the Thai Meteorological Department’s website at www.tmd.go.th or call 0-2399-4012-13 or 1182, both available 24/7. The alert was issued yesterday at 5pm.

Province risk levels by day

April 18

April 19

April 20

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Thailand’s Meteorological Department has issued its seventh warning about a summer storm set to impact upper Thailand from April 17 to 20, bringing thunderstorms, strong winds, and hail to several areas.

The storm will first strike the northeastern and eastern regions before moving to the central region, including Bangkok and surrounding provinces, then the north. A high-pressure system and cold air mass from China spreading over the South China Sea is strengthening southern and southeastern winds over the lower northeast, east, and upper Gulf of Thailand, while upper Thailand is already experiencing very hot conditions.

Residents are urged to avoid open spaces, large trees, unstable structures, and billboards. Farmers are advised to reinforce fruit trees and prepare to protect agricultural produce and livestock, reported KhaoSod.

April 17

High-risk northeastern provinces include Bueng Kan, Sakon Nakhon, Nakhon Phanom, Yasothon, Amnat Charoen, Nakhon Ratchasima, Buriram, and Ubon Ratchathani. In the east, Sa Kaeo, Chachoengsao, Chon Buri, Chanthaburi, and Trat are also at high risk.

Moderate-risk areas span northern provinces Mae Hong Son, Chiang Mai, Chiang Rai, Phayao, Nan, Tak, Phitsanulok, and Phetchabun, along with northeastern provinces Loei, Chaiyaphum, Mukdahan, Roi Et, Surin, and Si Sa Ket. Eastern provinces Nakhon Nayok, Prachin Buri, and Rayong, as well as central provinces Lop Buri, Saraburi, Phra Nakhon Si Ayutthaya, Kanchanaburi, and Ratchaburi, including Bangkok and its vicinity, are also listed as moderate risk.

April 18

High-risk northeastern provinces include Mukdahan, Yasothon, Amnat Charoen, Nakhon Ratchasima, Buriram, Surin, Si Sa Ket, and Ubon Ratchathani. Eastern provinces Nakhon Nayok, Prachin Buri, Sa Kaeo, Chachoengsao, and Chon Buri face similar risk.

Moderate-risk areas include northern provinces Mae Hong Son, Chiang Mai, Chiang Rai, Phitsanulok, and Phetchabun, along with northeastern provinces Bueng Kan, Sakon Nakhon, Nakhon Phanom, Chaiyaphum, Khon Kaen, Kalasin, Maha Sarakham, and Roi Et. Central provinces Lop Buri and Saraburi, including Bangkok and its vicinity, and eastern provinces Rayong, Chanthaburi, and Trat round out the moderate-risk zones.

April 19

High-risk northern provinces include Chiang Rai, Phayao, Nan, Uttaradit, Phitsanulok, and Phetchabun. Northeastern provinces at high risk are Loei, Nong Khai, Bueng Kan, Nong Bua Lamphu, Udon Thani, Sakon Nakhon, Nakhon Phanom, Chaiyaphum, Khon Kaen, Nakhon Ratchasima, and Buriram. Central provinces Lop Buri, Saraburi, and Phra Nakhon Si Ayutthaya, including Bangkok and its vicinity, as well as eastern provinces Nakhon Nayok, Prachin Buri, and Sa Kaeo, are also at high risk.

Moderate-risk areas include northern provinces Chiang Mai and Phrae, northeastern provinces Kalasin, Mukdahan, Maha Sarakham, Roi Et, Yasothon, Amnat Charoen, Surin, Si Sa Ket, and Ubon Ratchathani. Central provinces Nakhon Sawan, Sing Buri, Ang Thong, Nakhon Pathom, and Samut Sakhon, along with eastern provinces Chachoengsao, Chon Buri, Rayong, Chanthaburi, and Trat, are also included.

April 20

No high-risk areas are forecast for this date. Moderate-risk northern provinces include Nan, Uttaradit, Phitsanulok, and Phetchabun. Northeastern provinces Loei, Nong Khai, Bueng Kan, Nong Bua Lamphu, Udon Thani, Khon Kaen, Chaiyaphum, Nakhon Ratchasima, Buriram, Surin, Si Sa Ket, and Ubon Ratchathani are listed. Central provinces Lop Buri, Saraburi, Phra Nakhon Si Ayutthaya, Nakhon Pathom, and Samut Sakhon, including Bangkok and its vicinity, and eastern provinces Nakhon Nayok, Prachin Buri, Chachoengsao, and Chon Buri round out the forecast.

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Thailand will see hot to very hot weather today, April 7, with temperatures reaching 42°C (degrees Celcius) in the North, Northeast and Central regions, as a heat low-pressure cell brings haze across upper Thailand and isolated thundershowers in some areas.

The Thai Meteorological Department said a heat low-pressure cell remains over upper Thailand, bringing hot daytime conditions across much of the country. Weak southerly and southwesterly winds are also affecting upper Thailand, with isolated light thundershowers expected.

In the South, isolated thundershowers and gusty winds are forecast on both coasts. Westerly winds are prevailing over the Andaman Sea, the South and the upper Gulf, while southeasterly winds are affecting the lower Gulf.

Waves in the Gulf of Thailand and the Andaman Sea are expected to reach about one metre, rising above one metre in thundershowers, with ships advised to avoid storm areas.

Regional weather report

In the North, the weather will be hot with haze and isolated very hot conditions. Isolated thundershowers are expected mainly in the western and upper parts, with temperatures of 22 to 27°C at the low end and 37 to 42°C at the high end. Southwesterly winds are forecast at 5 to 15 kilometres per hour (km/h).

The Northeast will see hot to very hot weather with haze and isolated thundershowers, mostly in the lower part of the region. Temperatures will range from 21 to 27°C, with highs of 37 to 41°C and southwesterly winds of 10 to 15 km/h.

Central Thailand is forecast to have hot weather with haze and isolated very hot conditions. Temperatures will range from 24 to 26°C, with highs of 38 to 42°C and southwesterly winds of 10 to 15 km/h.

In the East, hot weather and haze are expected, with isolated thundershowers mainly in the lower part. Temperatures will range from 24 to 28°C, with highs of 33 to 39°C. Southerly winds will reach 15 to 30 km/h, with waves around one metre and above one metre in thundershowers.

On the South East Coast, hot daytime weather is forecast with isolated thundershowers and gusty winds, mainly in Nakhon Si Thammarat, Phatthalung, Songkhla, Pattani, Yala and Narathiwat. Temperatures will range from 22 to 26°C, with highs of 33 to 39°C. Westerly winds are expected at 15 to 30 km/h, with waves around one metre and above one metre in thundershowers.

On the South West Coast, isolated thundershowers and gusty conditions are expected mainly in Krabi, Trang and Satun. Temperatures will range from 24 to 27°C, with highs of 33 to 36°C. Northwesterly winds will reach 15 to 30 km/h, with waves around one metre and higher in thundershowers.

Bangkok and surrounding areas will be hot with haze and isolated, very hot conditions. Temperatures are forecast at 26 to 29°C overnight and 36 to 40°C during the day, with southerly winds of 10 to 15 km/h.

The forecast covers the period from 6am today to 6am tomorrow, according to the April 7 announcement.

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Thailand’s Meteorological Department has warned of severe weather tomorrow, with thunderstorms, hail, and strong winds forecast across 40 provinces, with the northeast among the worst-affected regions.

Over the next 24 hours, the upper part of Thailand will experience hot daytime weather. Rainfall is set to increase in the northeast and east, with thunderstorms, strong winds, and occasional hail forecast for the lower north, northeast, central, and eastern areas.

The unsettled conditions are driven by a low-pressure heat system over upper Thailand, combined with stronger southerly and southeasterly winds drawing moisture from the South China Sea and the Gulf of Thailand. Residents should avoid open spaces, large trees, unstable structures, and billboards. Farmers are advised to reinforce fruit trees and take steps to protect crops and livestock. With hot weather persisting, maintaining good health is also recommended.

In the south, scattered thunderstorms are expected due to southeasterly winds over the Gulf of Thailand, the southern region, and the Andaman Sea. Waves will reach about 1 metre, rising above 2 metres in stormy conditions. Mariners in both the Gulf of Thailand and the Andaman Sea should exercise caution and avoid sailing in thunderstorm-prone areas.

Air quality in the upper part of Thailand remains at a good level thanks to effective ventilation. The forecast covers the period from 6pm today to 6pm tomorrow.

North

Hot daytime weather with thunderstorms is forecast for 10% of the area, particularly in Tak, Phichit, Phitsanulok, and Phetchabun. Night temperatures will range from 18 to 25°C, climbing to 34 to 39°C during the day, with southwesterly winds at 5 to 15 km/h.

Northeast

Forty per cent of the region will be affected by thunderstorms and strong winds, with hail possible in Loei, Nong Khai, Bueng Kan, Sakon Nakhon, Nakhon Phanom, Chaiyaphum, Khon Kaen, Maha Sarakham, Nakhon Ratchasima, Buriram, Surin, Si Sa Ket, and Ubon Ratchathani. Temperatures will range from 20 to 25°C overnight to 33 to 38°C during the day, with southeasterly winds at 10 to 15 km/h.

Central

Hot daytime weather with thunderstorms will affect 20% of the area, including Lop Buri, Saraburi, Phra Nakhon Si Ayutthaya, Kanchanaburi, Ratchaburi, Nakhon Pathom, Samut Sakhon, and Samut Songkhram. Temperatures will range from 24 to 26°C at night to 35 to 38°C during the day, with southerly winds at 10 to 15 km/h.

East

Forty per cent of the area will face thunderstorms, strong winds, and hail, particularly in Nakhon Nayok, Prachin Buri, Sa Kaeo, Chachoengsao, Chon Buri, Rayong, Chanthaburi, and Trat. Temperatures will range from 24 to 27°C at night to 30 to 37°C during the day, with southeasterly winds at 15 to 30 km/h. Waves will reach about 1 metre, rising above 2 metres during thunderstorms.

Eastern South

Thunderstorms will affect 10% of the area, mainly in Phetchaburi, Prachuap Khiri Khan, Chumphon, and Surat Thani. Temperatures will range from 22 to 26°C overnight to 32 to 37°C during the day. Southeasterly winds at 15 to 30 km/h will produce waves of about 1 metre, exceeding 2 metres in stormy areas.

Western South

Ten per cent of the area will see thunderstorms, particularly in Ranong, Phang Nga, and Phuket. Temperatures will range from 23 to 26°C at night to 33 to 36°C during the day, with southeasterly winds at 15 to 30 km/h and sea waves about 1 metre high, rising higher in thunderstorms.

Bangkok and surroundings

Hot daytime weather with thunderstorms will affect 10% of the area. Temperatures will range from 26 to 28°C overnight to 34 to 37°C during the day, with southerly winds at 10 to 15 km/h.

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Thailand’s Meteorological Department has issued a weather warning for today, March 14, forecasting thunderstorms across 29 provinces, including Bangkok and surrounding areas, driven by a moderate high-pressure system from China pushing easterly and southeasterly winds over upper Thailand.

Over the next 24 hours, rainfall is expected to ease across upper Thailand, though isolated thunderstorms remain likely. The central region, Bangkok, and the eastern provinces will see hot daytime conditions. Residents are advised to watch out for thunderstorms and take care of their health as temperatures climb.

In the south, isolated storms are driven by moderate easterly winds over the Gulf of Thailand and the Andaman Sea. Waves in the lower Gulf are expected to reach 1 to 2 metres, rising above 2 metres in storm-affected areas. Sailors are urged to avoid sailing in stormy conditions.

Dust and haze levels across upper Thailand are currently moderate, aided by good ventilation. Bangkok and the central region are an exception, where poor ventilation is keeping air quality at a moderate to high level of concern.

Regional Breakdown

From 6am today to 6am tomorrow, the northern region can expect thunderstorms across 20% of the area, particularly in Mae Hong Son, Chiang Mai, Chiang Rai, Lamphun, Lampang, Phayao, Nan, and Tak. Temperatures will range from 18 to 24 degrees Celsius (°C), with highs between 27°C and 35°C, and easterly winds at 10 to 20 km/h.

In the northeast, storms are forecast for 10% of the area, concentrated in Loei, Nong Khai, and Nakhon Ratchasima. Temperatures will sit between 17°C and 22°C, peaking at 31°C to 35°C, with northeasterly winds at 10 to 30 km/h.

The central region will be hot, with thunderstorms in 10% of the area, mainly in Kanchanaburi, Ratchaburi, Nakhon Pathom, Samut Sakhon, and Samut Songkhram. Temperatures will range from 24°C to 26°C, reaching highs of 33°C to 35°C, with easterly winds at 10 to 20 km/h.

The east will also see hot conditions and storms in 10% of the area, particularly in Chon Buri, Rayong, Chanthaburi, and Trat. Temperatures will be between 23°C and 26°C, with highs of 32°C to 36°C and easterly winds at 15 to 30 km/h. Coastal waves are expected at around 1 metre, rising above 2 metres during storms.

Along the eastern Gulf coast, thunderstorms are forecast for 20% of the area, mainly in Phetchaburi, Prachuap Khiri Khan, Chumphon, Surat Thani, and Nakhon Si Thammarat. Temperatures will range from 23°C to 26°C, peaking at 31°C to 35°C. North of Chumphon, easterly winds will blow at 15 to 30 km/h, with waves around 1 metre. South of Surat Thani, winds will reach 15 to 35 km/h, with waves between 1 and 2 metres.

On the western Andaman coast, storms are expected in 10% of the area, mainly in Ranong, Phang Nga, and Phuket. Temperatures will be between 23°C and 26°C, with highs of 32°C to 36°C and easterly winds at 15 to 30 km/h. Waves will reach about 1 metre, rising further offshore and during storms.

Bangkok and surrounding areas will be hot during the day, with thunderstorms in 10% of the area. Temperatures will range from 23°C to 27°C, peaking at 34°C to 36°C, with southeasterly winds at 10 to 20 km/h.

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Thailand’s Meteorological Department has forecast that upper Thailand will continue to experience thunderstorms and strong winds tomorrow, with 41 provinces, including Bangkok, expected to be affected.

On March 6, the department released its weather forecast for the next 24 hours, warning that a summer storm will bring thunderstorms, strong winds, and isolated lightning strikes to upper Thailand. The conditions are driven by a high-pressure system from China covering northeastern Thailand and the South China Sea, pushing southerly and southeasterly winds to carry moisture from the South China Sea and the Gulf of Thailand over upper Thailand.

The convergence of southwesterly and southeasterly winds is expected over the lower central region, the east, and the lower northeastern region. Residents are advised to avoid open areas, large trees, weak structures, and unstable billboards.

Farmers are urged to strengthen fruit trees and prepare to protect agricultural produce and livestock from potential damage.

The southern region will see increased rainfall and strong winds due to strengthening easterly and southeasterly winds over the Gulf of Thailand, combined with westerly winds over the Andaman Sea. Waves in the lower Gulf of Thailand may reach 1 to 2 metres, with thunderstorm areas seeing waves exceeding two metres. Mariners in both the Gulf of Thailand and the Andaman Sea should avoid sailing in thunderstorm-affected areas.

Dust levels in the north, central region, including Bangkok and its vicinity, and the east remain moderate to high due to weak to moderate air circulation.

Weather forecasts for Thailand from 6pm today to 6pm tomorrow are as follows:

Northern region: Thunderstorms are expected over 10% of the area with strong winds in places such as Mae Hong Son, Chiang Mai, Lamphun, Sukhothai, Tak, Kamphaeng Phet, and Phetchabun. Temperatures will range from 19 to 25 degrees Celsius to a maximum of 33 to 37 degrees Celsius. Southeasterly winds will blow at 5 to 15 km/h.

Northeastern region: Thunderstorms are forecast over 10% of the area with strong winds mainly in Loei, Chaiyaphum, Nakhon Ratchasima, and Buriram. Temperatures will vary from 18 to 22 degrees Celsius to 32 to 34 degrees Celsius. Easterly winds are expected at 10 to 25 km/h.

Central region: Thunderstorms will affect 20% of the area with strong winds in Nakhon Sawan, Uthai Thani, Suphan Buri, Kanchanaburi, Ratchaburi, Nakhon Pathom, Samut Sakhon, and Samut Songkhram. Temperatures will range from 23 to 25 degrees Celsius to 34 to 35 degrees Celsius. Southeasterly winds will blow at 10 to 15 km/h.

Eastern region: Thunderstorms are predicted for 20% of the area with strong winds in Nakhon Nayok, Prachin Buri, Sa Kaeo, Chachoengsao, Chon Buri, Rayong, and Chanthaburi. Temperatures will range from 23 to 25 degrees Celsius to 32 to 36 degrees Celsius. Southeasterly winds will prevail at 15 to 30 km/h, with waves reaching about one metre and over two metres in thunderstorm areas.

Southern region (east coast): Thunderstorms are expected over 30% of the area with strong winds in Phetchaburi, Prachuap Khiri Khan, Chumphon, Surat Thani, Nakhon Si Thammarat, Phatthalung, Songkhla, Pattani, Yala, and Narathiwat. Temperatures will range from 21 to 24 degrees Celsius to 32 to 36 degrees Celsius. From Surat Thani upwards, southeasterly winds will blow at 15 to 30 km/h with waves of about one metre and over two metres in thunderstorm areas. From Nakhon Si Thammarat downwards, easterly winds will prevail at 15 to 35 km/h with waves from one to two metres, exceeding two metres in thunderstorm areas.

Southern region (west coast): Thunderstorms are anticipated over 30% of the area with strong winds in Ranong, Phang Nga, Krabi, Trang, and Satun. Temperatures will vary from 22 to 25 degrees Celsius to 31 to 36 degrees Celsius. Easterly winds will blow at 15 to 30 km/h, with waves about one metre high offshore and exceeding two metres in thunderstorm areas.

Bangkok and surrounding areas: Thunderstorms are expected over 20% of the area with strong winds. Temperatures will range from 25 to 26 degrees Celsius to 34 to 36 degrees Celsius. Southeasterly winds will blow at 10 to 15 km/h.

The Meteorological Department warns that the summer storm will bring heavy rain and strong winds across the affected regions, reported KhaoSod.

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