Short answer: November to February is the sweet spot — dry, 26–32°C and low humidity. March to May is hot (up to 38°C) but cheap. June to October is the monsoon: fewer crowds, dramatic green landscapes and hotel rates 30–50% lower, with rain usually arriving in short afternoon bursts rather than all day.
Thailand has three different climates
- Bangkok and the central plains: hottest in April, wettest in September. Good year round for city travel — you are indoors and in air-conditioned malls much of the time.
- Andaman coast (Phuket, Krabi, Phi Phi): dry November to April, monsoon May to October. Ferries to the smaller islands can be cancelled in the peak of the monsoon.
- Gulf coast (Koh Samui, Koh Phangan): almost the opposite pattern — heaviest rain October to December, best weather January to August. If it is raining in Phuket, Samui may be sunny.
Month-by-month, quickly
| Month | Weather | Crowds | Verdict |
|---|---|---|---|
| January | Dry, 22–32°C, perfect | High | Best all-round month |
| February | Dry, warm, superb visibility | High | Excellent for islands |
| March | Heating up, still dry | Medium | Good value, strong sun |
| April | Hottest month, 38°C+ | Medium (Songkran week is peak) | Cheap, but plan shade and water |
| May | First rains, humid | Low | Very cheap, green landscapes |
| June–August | Monsoon, short heavy showers | Low–medium | Lowest prices, some ferry cancellations |
| September | Wettest month in Bangkok | Low | Cheapest; best for city trips |
| October | Rain tapering off | Low–medium | Great value from mid-month |
| November | Dry season begins, cooler | Medium–high | Excellent |
| December | Dry, cool evenings, festive | Very high (20 Dec onward) | Book 60+ days ahead |
Festivals worth planning around
- Songkran (13–15 April): the Thai New Year water festival. Enormous fun in Chiang Mai and Bangkok, but roads are chaotic and hotels sell out — book early or avoid.
- Loy Krathong (November): floating candle-lit baskets on rivers and lakes; Yi Peng lantern festival in Chiang Mai is the famous one. Beautiful, and a genuinely good reason to visit.
- Chinese New Year (January/February): big in Bangkok's Chinatown and Phuket; busy but atmospheric.
- Vegetarian Festival, Phuket (October): striking, intense street processions — not for the faint-hearted.
Cheapest weeks to fly from India
- Late January to mid-February (after the New Year rush, before Chinese New Year)
- Mid-May to mid-June
- September, excluding long weekends
- Avoid: 20 December – 5 January, Songkran week, and Diwali week
Flights from Delhi, Mumbai or Kolkata to Bangkok range from ₹14,000 to ₹26,000 return. Phuket typically costs ₹4,000–₹7,000 more, or you can fly into Bangkok and take a domestic flight for around ₹2,500.
Practical advice for the monsoon
- Travel insurance matters more in the monsoon — ferry and domestic flight cancellations are common. Our international plans cover delay and missed connections.
- Book refundable hotels; many resorts in Krabi and Koh Samui offer free cancellation into the low season.
- Keep one buffer day before your international departure.
- Rain in Thailand is usually a 30–90 minute downpour, then sunshine. It rarely ruins a full day.
Our take: for a first Thailand trip, aim for November to February on the Andaman coast. Our Thailand Twin Delight package (Bangkok + Pattaya or Phuket, 5 days / 4 nights) starts at ₹29,999 per person with hotels, transfers, the island tour and the Alcazar show included.