Thailand Weather & Flight Booking Calendar
Thailand weather is hot year-roundand in the North it can get even hotter, normally daytime highs sit between 30°C and 36°C in every month
Weather in Thailand can be very unpredictable it can be raining one minuet sunshine the next, and the humidity.
November to February is a cool-part of the year, March to May can be brutally hot, June to October in the south Krabi and Phuket get the monsoons, around Ko Samui stays dry until it has its own wet season in November.
In my opinion November and December are the best months to visit, for Thailand weather , tempretures are more comfortable and the rain is starting to subside.
Thailand Weather Month by Month
January
Bangkok 32°C Hot
Phuket 32°C Dry
Ko Samui 29°C Drying Out
Chaing Mai 29°C Dry and Cool Nights
Excellent Weather Everywhere
January Flight Prices
- Best for summer bargains
- Watch airline sales
- Compare routes
£779 to £890 Average Prices
2027 Prices
Febuary
Bangkok February 33°C Dry
Phuket 33°C Dry
Ko Samui 30°C Dry
Chaing Mai 30°C Dry Haze Starts
Excellent Weather Everywhere
Febuary Flight Prices
- Watch airline sales
- Compare routes
Average Prices £779 to £890
2027 Prices
March
Bangkok 34°C Hot
Phuket 33°C Dry
Ko Samui 31°C Dry
Chaing Mai 35°C Hot Burning Season
Good Beaches But Miss The North
March Flight Prices
- Easter booking period
£705 to £816 Average Prices
2027 Prices
April
Bangkok 35°C Hottest
Phuket 33°C Scatterd Showers
Ko Samui 32°C Dry Weather
Chaing Mai 36°C Peak Heat and Haze
Songkran Festival on th 12th 15th Very Hot
April Flight Prices
- Summer travel planning begins
£742 to £780 Average Prices
2027 Prices
May
Bangkok 34°C Storms Begin
Phuket 32°C Monsson Starts
Ko Samui 32°C Mostley Dry Weather
Chaing Mai 33°C Rain Clears The Air
Still Hot
May Flight Prices
- Monitor school holiday prices
Average Prices £600 to £705
2027 Prices
June
Bangkok 33°C Stormy Weather
Phuket 31°C Rainy
Ko Samui 31°C Sunny Spells
Chaing Mai 32°C Rainy Season
The Gulf is Excellent
June Flight Prices
- Early Christmas fare tracking
£600 to £705 Average Prices
2027 Prices
July
Bangkok 33°C Showers
Phuket 33°C Showers
Ko Samui 32°C Dry
Chaing Mai 36°C Peak Heat
The Gulf is Excellent
July Flight Prices
- Airlines begin releasing more winter availability
£630 to £742 Average Prices
2027 Prices
August
Bangkok 33°C Rainy
Phuket 31°C Heavy Rain
Ko Samui 31°C Decent Weather
Chaing Mai 31°C Rainy
Maya Bay is Closed
August Flight Prices
- Start watching Christmas Flights
- Set fare alerts
- Compare airlines
- Don’t rush ye
London⇒Bangkok
September
Bangkok 32°C Wettest
Phuket 30°C Wettest
Ko Samui 30°C Rain Building
Chaing Mai 31°C Wettset
A Very Wet Month
September Flight Prices
- One of the best months to book
- Prices often remain reasonable
- Plenty of seat availability
- Good airline choice
London⇒Bangkok
Thai Airways £761 Round-trip Eva Air £784 Round-trip Direct 2026 Prices
October
Bangkok 32°C Clearing
Phuket 31°C Improving
Ko Samui 29°C Season Starts
Chaing Mai 30°C Lush
North Improves
October Flight Prices
- Prime booking month
- Book if you find a fare you’re happy with
- Christmas seats start disappearing
London⇒Bangkok
Thai Airways £788 Round-trip
Eva Air £807 Round-trip
November
Bangkok 31°C Dry
Phuket 31°C Dry
Ko Samui 28°C Wettest
Chaing Mai 29°C Gorgeous Weather
Aderman and the North Excellent
- Last realistic opportunity for good Christmas prices
- Expect prices to rise
- Limited direct flight availability
- Popular departure dates sell quickly
London⇒Bangkok
December
Bangkok 31°C Dry
Phuket 31°C Dry
Ko Samui 28°C Rain Early
Chaing Mai 27°C Dry And Cool
Peak Season Everywhere Ko Samui Starts Earlier
December Flight Prices
- Last-minute travel
- Focus on New Year departures
- Prepare for next year’s bookings
London⇒Bangkok
Austrian Airlines £709 Round-trip Thai Airways £979 Round-trip
2026 Prices
Thailand trip cost calculator
Adjust the sliders to estimate your total trip cost in GBP. Prices updated for 2026.
Estimates only · Prices in GBP · Hotel shown per room (assumes 2 sharing) · Flight prices vary by season and how far ahead you book.
Frequently Asked Questions
WHAT ARE THE HOTTEST MONTHS
April — Bangkok averages 35°C and regularly spikes toward 40°C, with the north (Chiang Mai) at 36°C under burning-season haze. It’s also Songkran month (April 13–15), when the nationwide water fight makes the heat briefly feel like the point.
WHAT IS THE COLDEST MONTH
December and maybe January, Bangkok still hits 31°C by day. The real cool is in the north, nights drop as low 14–16°C and the day times around 20°C Pack one warm layer for northern December evenings.
WHAT IS THE RAINIEST MONTH
September, on the South coasts and in the north — Bangkok, Phuket, and Chiang Mai all record their highest monthly rainfall. Ko Samui and the Gulf islands, whose wettest month is November, driven by the monsoon from the northeast not than the southwest one.
WHAT IS THE MONTH FOR THE BEST THAILAND WEATHER
January for the country is mainly dry and sunny in Bangkok, on both coasts, and in the north, with the year’s lowest humidity. Second is February with slightly fewer Tourists. If your trip is north-focused, November and December edge ahead thanks to cooler nights, clean air.
DOES IT RAIN ALL DAY DURING THE RAINY SEASON
Monsoon rain typically falls in the afternoon or evening downpours lasting from 10 minuets to one or two hours, with sunshine either side — you can travel through the wet season comfortably by planning outdoor mornings.
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