Weather in Bangkok in January

A good month. January works. It is not the peak, but nothing about it fights you. Highs average 33.1 °C, lows 20.4 °C, and rain falls on 3 days — nothing in the month is working against you.

January ranks 3 of 12 in Bangkok. Only December scores clearly higher, and the difference is small enough to be settled by price rather than weather.

Rain falls on only 3 days, so an itinerary with no wet-weather fallback is a reasonable risk. Pack for 33.1 °C days and 20.4 °C nights; the spread matters more here than any single number.

What the averages hide

Averages flatten a month, and this one hides a few things: 7 days clear 35 °C, so a serious heatwave is normal rather than notable. Across the twenty years measured, the hottest January day reached 38.6 °C and the coldest night fell to 11.1 °C.

This is the volatile part. January rainfall has ranged from 0 mm to 54 mm across the twenty years measured — a 54 mm spread around an average of 17 mm. The average is real but almost no individual January looks like it, so treat the figure as the middle of a wide range rather than a forecast.

Wind is light at 6.1 km/h, so the temperature on the page is close to the temperature on your skin, and humidity is unremarkable at 64%.

How January sits in the year

The month is on the way up: 2.2 °C warmer than December, and February adds another 2.8 °C. Late in the month feels noticeably different from the start of it, which is worth knowing if the trip is short.

Daylight in January

Bangkok sits close enough to the equator that daylight barely moves all year — 11.4 hours in January, against a range of just 1.6 hours across the whole calendar. Sunrise and sunset land at roughly the same time whenever you come.

An inland climate

Despite being inland, the year stays fairly even: 17.1 °C between the year's warmest afternoons and coldest nights.

How busy it gets

Busy. Popular without being frantic; book the things you care about, improvise the rest.

Crowd levels are estimated from climate desirability and school-holiday calendars, not from visitor numbers.

January in Bangkok versus nearby

If Bangkok is one option among several, the nearby comparison is worth making. Lat Krabang is close enough to be a coin toss — within a degree on temperature, 1 day more rain. Hua Hin is a better bet in January — 4.3 °C cooler, 3 days more rain.

So: January works, with December the better month by 11 points if the dates can move. If they cannot, nothing here should stop you booking.

Every month in Bangkok

See all twelve months in Bangkok, or where else to go in January.