Weather in Chiang Mai in January

Prime time. January is about as good as Chiang Mai gets. Highs average 28.9 °C, lows 16.5 °C, and rain falls on 2 days — nothing in the month is working against you.

January ranks 2 of 12 in Chiang Mai. Only December scores clearly higher, and the difference is small enough to be settled by price rather than weather.

Rain falls on only 2 days, so an itinerary with no wet-weather fallback is a reasonable risk. Pack for 28.9 °C days and 16.5 °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: 11 days top 30 °C — hot spells arrive, but they break. Across the twenty years measured, the hottest January day reached 35.9 °C and the coldest night fell to 9 °C, and the wettest single day dropped 42 mm — roughly 280% of the month's rain in one day.

This is the volatile part. January rainfall has ranged from 0 mm to 66 mm across the twenty years measured — a 66 mm spread around an average of 15 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 1.1 km/h, so the temperature on the page is close to the temperature on your skin, and humidity is unremarkable at 67%.

How January sits in the year

Temperatures hold steady either side: 27.6 °C in December, 28.9 here, 32.7 in February. Nothing about the timing within the month matters much.

Daylight in January

January sits at the dark end of Chiang Mai's year — 11.1 hours of daylight against 13.3 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: 20.8 °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.

January in Chiang Mai versus nearby

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

So: January is effectively as good as it gets here — 6 points behind December, which is inside the margin where the weather stops being the deciding factor and price starts being it.

Every month in Chiang Mai

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