Weather in Udon Thani in December

Prime time. If you get to pick your dates, December is the one. Highs average 28.3 °C, lows 15.4 °C, and rain falls on 1 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 April.

Rain falls on only 1 days, so an itinerary with no wet-weather fallback is a reasonable risk. Pack for 28.3 °C days and 15.4 °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: 10 days top 30 °C — hot spells arrive, but they break. Across the twenty years measured, the hottest December day reached 35.5 °C and the coldest night fell to 5.9 °C.

December is dependably dry, and that reliability is the point: across the twenty years measured, the wettest December on record still only managed 33 mm, and the driest managed 0 mm. There is no meaningful variability to plan around, which makes this one of the few months anywhere that you can build a fixed outdoor itinerary against without a fallback. The wettest single day in twenty years of Decembers brought 20 mm. Rain simply is not the variable that decides this trip — heat, crowds and cost are.

Wind is light at 7.7 km/h, so the temperature on the page is close to the temperature on your skin, and humidity is unremarkable at 67%.

How December sits in the year

Temperatures hold steady either side: 29 °C in November, 28.3 here, 29.9 in January. Nothing about the timing within the month matters much.

Daylight in December

December sits at the dark end of Udon Thani's year — 11.1 hours of daylight against 13.2 at midsummer, holding steady all month. Sightseeing days are genuinely shorter, and an itinerary built for summer will not fit.

An inland climate

Despite being inland, the year stays fairly even: 21.9 °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 Udon Thani versus nearby

If Udon Thani is one option among several, the nearby comparison is worth making. Nakhon Ratchasima is close enough to be a coin toss — within a degree on temperature, the same number of rain days. Luang Prabang is close enough to be a coin toss — within a degree on temperature, 1 day more rain.

So: December is the answer for Udon Thani. If it is booked out or priced out, November is the next best thing at 7 points behind, and April is the month to keep off the shortlist.

Every month in Udon Thani

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