Thailand Heavy Rain Warning July 26–30: Flash Floods and Rough Seas Alert
Thailand heavy rain warning issued July 25, 2026 by TMD covers July 26–30 — heavy to very heavy rainfall, flash floods and rough Andaman Sea seas across all regions.
Thailand heavy rain warning has been issued by the Thai Meteorological Department (TMD) covering five consecutive days from July 26 to 30, 2026 — a period that includes the King’s Birthday public holiday on July 28, the Asalha Bucha dry day on July 29, and Khao Phansa on July 30.
The TMD’s fourth warning, issued at 5am on July 25, forecasts heavy to very heavy rainfall across much of the country, with flash floods, forest run-off, and rough seas as specific risks. A monsoon trough crossing the North and upper Northeast, combined with a strengthening southwest monsoon over the Andaman Sea and the Gulf of Thailand, is driving the intensity.
What the Warning Covers: Rainfall and Sea Conditions
The Thailand heavy rain warning has two components — inland rainfall risk and coastal sea conditions.
Inland: Very heavy rain (red alert) in specific provinces each day, with heavy rain (orange alert) across a much wider area. Flash floods, forest run-off from hillsides, and rapid flooding near waterways are the primary risks. Low-lying areas and hillside communities are most vulnerable.
Sea conditions:
- Upper Andaman Sea: waves 2–3 metres, rising above 3 metres during thunderstorms
- Upper Gulf of Thailand: waves around 2 metres, exceeding 2 metres during storms
- Lower Andaman Sea: waves around 2 metres, exceeding 2 metres during storms
Mariners must proceed with caution and avoid thunderstorm-affected areas. Small boats in the upper Andaman Sea must remain ashore throughout the warning period.
Day-by-Day Province Alert List July 26–30
Here is the complete TMD province-level breakdown for each day of the Thailand heavy rain warning period.
July 26
Very heavy rain: Ranong.
Heavy rain: Mae Hong Son, Tak, Nong Khai, Bueng Kan, Sakon Nakhon, Nakhon Phanom, Ubon Ratchathani, Kanchanaburi, Chanthaburi, Trat, Phang Nga.
July 27
Very heavy rain: Nong Khai, Bueng Kan, Nakhon Phanom, Kanchanaburi, Chanthaburi, Trat, Ranong, Phang Nga.
Heavy rain: Mae Hong Son, Chiang Rai, Nan, Tak, Sakon Nakhon, Mukdahan, Amnat Charoen, Ubon Ratchathani, Ratchaburi, Saraburi, Nakhon Nayok, Prachinburi, Rayong, Prachuap Khiri Khan, Chumphon, Surat Thani, Phuket.
July 28 (King’s Birthday Public Holiday)
Very heavy rain: Nong Khai, Bueng Kan, Nakhon Phanom, Mukdahan, Amnat Charoen, Ubon Ratchathani, Kanchanaburi, Rayong, Chanthaburi, Trat, Ranong, Phang Nga.
Heavy rain: Mae Hong Son, Chiang Mai, Chiang Rai, Phayao, Nan, Tak, Udon Thani, Sakon Nakhon, Kalasin, Roi Et, Yasothon, Si Sa Ket, Ratchaburi, Saraburi, Nakhon Nayok, Prachinburi, Chumphon, Surat Thani, Nakhon Si Thammarat, Phatthalung, Phuket, Krabi, Trang.
July 29 (Asalha Bucha — Alcohol Ban Day)
Very heavy rain: Nong Khai, Bueng Kan, Kalasin, Maha Sarakham, Roi Et, Mukdahan, Yasothon, Amnat Charoen, Ubon Ratchathani, Kanchanaburi, Sa Kaeo, Chachoengsao, Rayong, Chanthaburi, Trat, Ranong, Phang Nga, Phuket.
Heavy rain: Mae Hong Son, Chiang Mai, Chiang Rai, Phayao, Nan, Uttaradit, Tak, Kamphaeng Phet, Phitsanulok, Phichit, Phetchabun, Loei, Udon Thani, Sakon Nakhon, Nakhon Phanom, Chaiyaphum, Nakhon Ratchasima, Buri Ram, Surin, Si Sa Ket, Nakhon Sawan, Uthai Thani, Lopburi, Saraburi, Phra Nakhon Si Ayutthaya, Bangkok and surrounding provinces, Nakhon Nayok, Prachinburi, Chonburi, Prachuap Khiri Khan, Chumphon, Surat Thani, Nakhon Si Thammarat, Phatthalung, Krabi, Trang.
July 30 (Khao Phansa — Alcohol Ban Day)
Very heavy rain: Phitsanulok, Phetchabun, Loei, Chaiyaphum, Kanchanaburi, Nakhon Nayok, Prachinburi, Rayong, Chanthaburi, Trat, Ranong.
Heavy rain: Mae Hong Son, Chiang Mai, Nan, Uttaradit, Tak, Kamphaeng Phet, Sukhothai, Phichit, Nong Khai, Bueng Kan, Nong Bua Lamphu, Udon Thani, Khon Kaen, Nakhon Ratchasima, Buri Ram, Nakhon Sawan, Uthai Thani, Saraburi, Phra Nakhon Si Ayutthaya, Kanchanaburi, Ratchaburi, Nakhon Pathom, Samut Sakhon, Bangkok and surrounding provinces, Sa Kaeo, Chachoengsao, Chonburi, Phetchaburi, Prachuap Khiri Khan, Chumphon, Surat Thani, Phang Nga, Phuket, Krabi.
| Thailand Heavy Rain Warning — Alert Level Summary | Dates |
|---|---|
| Ranong | Red alert all 5 days |
| Chanthaburi, Trat, Kanchanaburi | Red alert most days |
| Phuket, Phang Nga, Krabi | Heavy rain from July 27 — red alert July 29 Phuket |
| Bangkok and provinces | Heavy rain July 29–30 |
| Nong Khai, Bueng Kan, Nakhon Phanom | Red alert July 27–29 |
| Chiang Mai, Chiang Rai | Heavy rain from July 28 |
Tropical Storm Noul: What Indian Travelers in China Must Know
Severe Tropical Storm Noul is located over the upper South China Sea and expected to make landfall in Guangdong province, China, on July 26.
The storm will not move into Thailand. However, Indian travelers planning trips to southern China including Guangdong, Guangzhou, Shenzhen, and Hong Kong adjacent areas should check weather conditions before departure and monitor local authority updates as Noul approaches.
What This Means for Indian Travelers Currently in Thailand
The Thailand heavy rain warning directly affects Indian travelers on several itineraries this week.
Bangkok (July 29–30): Bangkok is listed under heavy rain for both July 29 and 30. Combined with both days being alcohol ban dry days — Asalha Bucha and Khao Phansa — the long weekend in Bangkok is best approached with indoor activities in mind. Malls including Siam Paragon, ICONSIAM, and Terminal 21 are ideal alternatives to outdoor plans.
Phuket (July 27–30): Phuket is under heavy rain from July 27 and very heavy rain on July 29. Boat excursions and island-hopping activities should be cancelled or booked day-by-day based on morning weather radar. Avoid open sea activities during rough conditions. The Andaman Sea is forecast at 2–3 metres with spikes above 3 metres in thunderstorms.
Krabi (July 27–30): Krabi is under heavy rain from July 28. Railay Beach, Koh Phi Phi, and other boat-access destinations face the same rough sea risk as Phuket. Do not book any fixed boat excursions through the warning period.
Chiang Mai (July 28–30): Chiang Mai enters the heavy rain zone from July 28. Mountain roads including routes to Doi Inthanon and Doi Suthep may face forest run-off and landslide risk. Check road conditions before any mountain excursions.
Koh Samui, Koh Phangan (Gulf of Thailand): The Gulf coast islands are not listed in the TMD warning’s heaviest-affected zones. Waves in the upper Gulf are expected around 2 metres — manageable for most ferry services but check operator status on each day.
Practical Safety Guidance
Residents in low-lying areas, on hillsides, and near waterways were advised to prepare for accumulated rainfall that could trigger sudden flooding. Residents in high-risk areas should monitor water levels and move possessions and electrical equipment above expected flood levels where necessary.
People travelling through mountainous areas or routes vulnerable to flooding should check road conditions before departure.
TMD hotline: 1182
TMD phones: 0-2399-4012 and 0-2399-4013
The next departmental warning was scheduled for 5pm on July 25. TMD issues updated warnings every morning and afternoon during active weather events — check every morning before making outdoor plans.
For travel insurance covering weather-related trip disruptions — cancelled boat tours, transport delays, and flood-related accommodation changes — SafetyWing Nomad Insurance provides comprehensive coverage at affordable daily rates for Indian travelers. Remember UPI does not work in Thailand — carry Thai Baht or a zero-forex international card for any emergency transport or hotel changes during the warning period.
FAQs — Thailand Heavy Rain Warning July 2026
Q: Which parts of Thailand are most affected by the July 26–30 rain warning?
The Thailand heavy rain warning issued by TMD covers all regions — but the most consistently red-alerted provinces are Ranong (all five days), Kanchanaburi, Chanthaburi, Trat, and the border between Northeast and the East. Phuket and Phang Nga face heavy to very heavy rain from July 27. Bangkok is under heavy rain on July 29 and 30. The Northeast — particularly Nong Khai, Bueng Kan, Ubon Ratchathani, and Nakhon Phanom — faces the most intense rainfall for July 26–29.
Q: Are boat trips and island activities safe during the Thailand heavy rain warning?
No — the TMD specifically warns that small boats in the upper Andaman Sea should remain ashore during the warning period. Waves of 2–3 metres in the upper Andaman Sea — rising above 3 metres in thunderstorms — make open sea activities dangerous. Indian travelers with boat excursions booked to Phi Phi Islands, the Similan Islands, or any Andaman Sea destinations should cancel or reschedule for after July 30. Koh Samui and the Gulf of Thailand islands face lower sea risk — around 2 metres — but check daily with your ferry operator before boarding.
Q: Is Bangkok affected by the heavy rain warning this week?
Yes — Bangkok and surrounding provinces are listed under heavy rain for both July 29 and July 30. These are also the two alcohol ban dry days — Asalha Bucha and Khao Phansa. Indian travelers in Bangkok during this period should plan indoor activities at major malls, museums, and covered attractions. Outdoor venues, canal boat tours, and street market visits are best rescheduled to earlier in the week when Bangkok is not under the active warning.
Final Word
The Thailand heavy rain warning for July 26–30 is one of the most significant five-day weather events to hit multiple tourist regions simultaneously this year — covering Phuket, Krabi, Bangkok, Chiang Mai, and the Northeast in the same window as the King’s Birthday holiday and the two alcohol ban days.
The practical response for Indian travelers is straightforward: stay off the Andaman Sea, avoid mountain roads in warning provinces, keep outdoor Phuket and Krabi plans flexible on a day-by-day basis, and use Bangkok’s indoor options for the July 29–30 rain-and-dry-day combination. Monitor TMD updates every morning through the 1182 hotline and plan accordingly — Thailand’s monsoon showers are intense but typically manageable when you know they are coming.
Also Read:
- Thailand Alcohol Ban July 2026 — Two Dry Days July 29 and 30
- Thailand Travel Advisory Indians July 2026 — Full Guide
- SafetyWing Nomad Insurance — Full Review for Indians
Official Sources:
Thailand Heavy Rain Warning July 26–30: Flash Floods and Rough Seas Alert
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Thailand Heavy Rain Warning July 26–30: Flash Floods and Rough Seas Alert
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Aaseem Bhardwaj is a journalist, seasoned traveler and IT professional based in India. With firsthand travel experience across Southeast Asia, East Asia, Middle East and Europe, Aaseem founded Travel Man Today to provide reliable visa updates and travel news for Indian passport holders. He has personally traveled to Thailand, Vietnam, Malaysia, Japan, Singapore, Hong Kong, South Korea, UAE and Europe. Follow his travel vlogs on YouTube at @travelmantoday
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