When to Visit Thailand: Seasons by Region
Thailand's weather varies by coast and altitude. Here is how to pick the right month for Bangkok, the Andaman islands, and the northern mountains.
There is no single bad time to visit Thailand, but there is often a better coast or region for your travel dates. Understanding the two monsoon systems — southwest and northeast — prevents booking a beach holiday during rough seas.
Cool Season (November–February)
The most popular window nationwide. Bangkok and Chiang Mai enjoy daytime temperatures around 28–32°C with lower humidity. Andaman coast beaches (Phuket, Krabi, Phi Phi) see calm seas and excellent snorkelling. Book accommodation early for Christmas and Chinese New Year peaks.
Hot Season (March–May)
Temperatures climb above 35°C in Bangkok and the central plains. Songkran (Thai New Year, mid-April) brings nationwide water festivals — fun but crowded. Northern burning season can haze Chiang Mai; check air quality if visiting in March or April.
Monsoon Considerations
Regional rainy peaks:
- Andaman (Phuket, Krabi): May–October
- Gulf (Koh Samui, Koh Phangan): October–December
- Bangkok: September–October heaviest rainfall
Rain typically arrives as intense afternoon storms rather than week-long washouts. Low season means fewer tourists and lower prices — viable for city-focused itineraries.
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