Weather in Bangkok in December

Prime time. December is about as good as Bangkok gets. Highs average 30.9 °C, lows 19.7 °C, and rain falls on 2 days — nothing in the month is working against you.

December is the highest-scoring month of the twelve. The nearest rival is November, and the month at the other end of the year is May.

Rain falls on only 2 days, so an itinerary with no wet-weather fallback is a reasonable risk. Pack for 30.9 °C days and 19.7 °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: 20 days top 30 °C, making the heat continuous rather than occasional. Across the twenty years measured, the hottest December day reached 36.5 °C and the coldest night fell to 10.1 °C.

This is the volatile part. December rainfall has ranged from 0 mm to 41 mm across the twenty years measured — a 41 mm spread around an average of 10 mm. The average is real but almost no individual December looks like it, so treat the figure as the middle of a wide range rather than a forecast.

Wind is light at 6.5 km/h, so the temperature on the page is close to the temperature on your skin, and humidity is unremarkable at 71%.

How December sits in the year

Temperatures hold steady either side: 30.5 °C in November, 30.9 here, 33.1 in January. Nothing about the timing within the month matters much. Rain has already shifted: 6 days fewer than November had.

Daylight in December

Bangkok sits close enough to the equator that daylight barely moves all year — 11.3 hours in December, 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

Peak season. Expect the highest prices of the year and to be booking well ahead.

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

December 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 close enough to be a coin toss — 2.7 °C cooler, 4 days more rain.

So: December is the answer for Bangkok. If it is booked out or priced out, November is the next best thing at 9 points behind, and May is the month to keep off the shortlist.

Every month in Bangkok

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