January · Thailand weather
Thailand in January: Weather, What to Expect & Where to Go
January is the heart of Thailand's cool-dry season. Bangkok and the north are at their most comfortable, the Andaman coast is dry and bright, and only the Gulf islands are still shaking off late-monsoon swells.
Best region
North
Chiang Mai sits in the low-20s with crisp mornings and clear skies — the best month of the year up here.
Avoid
Gulf
Samui is technically dry but lingering northeast monsoon swells still bring choppy seas and grey days.
Good for
Cool mornings in Chiang Mai, beach weather on the Andaman side
January weather, region by region
Average temperatures and rainfall across Thailand's five climate regions in January. Tap the climate map on the homepage for an interactive month-by-month view.
| Region | Avg temp | Rainfall | Visit rating |
|---|---|---|---|
North Chiang Mai | 22°C | 10mm | Great |
Northeast Nakhon Ratchasima (Korat) | 24°C | 5mm | Great |
Central Bangkok | 27°C | 10mm | Great |
Andaman Phuket | 28°C | 35mm | Great |
Gulf Koh Samui | 27°C | 55mm | Great |
City spotlights
One city per region — what January actually feels like on the ground, and what to do or skip.
North
Chiang Mai
Cool mornings, warm afternoons, almost no rain. Bring a light jacket for sunrise at Doi Suthep and early-morning markets — temperatures can dip below 15°C in the hills.
Year-round climate
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Northeast
Nakhon Ratchasima (Korat)
Cool, dry, and quiet. The Korat plateau sits at altitude, so early mornings can dip below 15°C — ideal for Phimai Historical Park and day trips up to Khao Yai National Park.
Year-round climate
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Central
Bangkok
About as good as Bangkok ever gets — temperatures hover around 27°C with low humidity. Markets, walking tours, and rooftop bars all comfortable.
Year-round climate
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Andaman
Phuket
Peak season for the Andaman side. Calm seas, dry days, and packed beaches — book hotels well in advance and expect peak pricing.
Year-round climate
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Gulf
Koh Samui
The driest of the wet months, but lingering swells and grey mornings can still spoil a beach week. Pick Phuket or Krabi instead if you've only got January.
Year-round climate
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Events & festivals in January
New Year's hangover
The post-NYE crowd thins out around the second week — wait until then for cheaper flights and quieter beaches.
Is January a good time to visit Thailand?
Yes — January is one of the two or three best months to visit Thailand. The trade-off is high-season pricing and busy beaches. If you want the same weather with smaller crowds, look at late November or February.
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Thailand in December
Cool-season highlights, NYE in Bangkok, family trips
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Thailand in February
Bangkok city breaks, Andaman island-hopping
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