Chiang Rai weather in December
December in Chiang Rai: hot, dry — one of the best months to visit.
Updated September 2026 · climate normals from ERA5 reanalysis
#2 of 12 months in Chiang Rai · #203 of 1413 destinations to visit in December · comfort 87/100 (tier A)
- Days
- 29°C
- Nights
- 16°C
- Wet days
- 4
- Sun
- 9.3 h
- Humidity
- 74%
- Daylight
- 11 h
Traveller notes on Chiang Rai in December
December is northern Thailand's clean window, and that is the strongest argument for it. The record puts Chiang Rai's air at AQI 55 in December, against 106 in March and 113 in April, when agricultural burning peaks. The forum's timeline matches: some haze exists from December onwards, but the heavy stuff — whole hillsides alight, the region choked — runs from late February into late April. Weather-wise December is dry and bright, mid-to-upper 20s by day and 15–18 at night. One practical note regulars give: very few Thai hotels have heating, and December nights up here are cool enough to notice.
Other months in Chiang Rai
Chiang Rai's own forum describes June as a month of two halves: the first couple of weeks tend to be pleasant with only occasional storms, then the rainy season properly sets in for the back half, bringing heavier downpours and the odd night where it rains straight through. Even so, one regular visitor noted that in a typical June trip only a handful of days actually forced a change of plans to something indoors - most days still get some sunshine between showers. Nights cool to the mid-20s C, which is a welcome break after a hot, humid afternoon.
Add your own note from Chiang Rai's card on the map.
Chiang Rai climate normals — December
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Crowds in Chiang Rai in December
How busy the place itself is — school and mass holidays, the months an editor tagged, and how sought-after the weather makes them. Never part of the comfort score.
Peak crowdsCool, dry season, Sea of mist at Phu Chi Fa, school holidays in 5 of the markets that fill it(estimated)
Peak crowdsBusyShoulder seasonQuiet
Best months for Chiang Rai's weather
Ranked by this destination's own climate comfort score across the year — a different thing from how busy it gets (see Crowds above).
Best weatherChiang Rai's weather peaks December–February, best around January.
December includes Sea of mist at Phu Chi Fa.
Best weatherFair weatherToughest weather
What's on in Chiang Rai in December
Recurring seasonal events, natural spectacles, closures and holidays — curated and sourced.
- Season
Cool, dry season
1 Nov – 15 Feb · usuallyCrowdedThe one stretch worth planning around: clear mornings on the hill roads, cold enough at Doi Mae Salong for a jacket at dawn, and the province at its busiest.
- Nature
Sea of mist at Phu Chi Fa
1 Nov – 15 Feb · usuallyFog seasonCrowdedCloud fills the valley below the ridge overnight and burns off by nine, so the walk up is done in the dark. Weekends the viewpoint is shoulder to shoulder before sunrise. Source ↗
- Holiday
Christmas and New Year peak
18 Dec – 5 JanChristmas & New YearCrowdedBook earlyThe weeks around Christmas and New Year are the busiest of the year here for both foreign and Thai visitors: rooms and transport sell out early and rates run at their highest. Source ↗
- Nature
Wild Himalayan cherry
20 Dec – 15 Feb · usuallyCherry blossomThai sakura along the ridges at Doi Mae Salong and above Mae Fah Luang, pink for a fortnight somewhere in the window. The exact week moves with how cold December was. Source ↗
Nearby, and something's on
Within 300 km of Chiang Rai — a day trip or a short hop — with something on this month. Never part of the comfort score.
Where is Chiang Rai?
Chiang Rai in December — FAQ
- Is December a good time to visit Chiang Rai?
- December in Chiang Rai: hot, dry — one of the best months to visit. It ranks #2 of 12 months for Chiang Rai on SeasonMap's comfort score (87/100).
- What is the weather like in Chiang Rai in December?
- In December, Chiang Rai averages a daily high of 28.5°C and a low of 16.2°C, with about 23.4 mm of rain over roughly 3.7 rainy days.
- What is the air quality in Chiang Rai in December?
- Chiang Rai has a mean US Air Quality Index of about 55 in December.
Within 300 km: Chiang Mai's Wild Himalayan cherry on the hills around 20 Dec – 31 Jan, and Luang Prabang's Dawn alms round etiquette on 1 Jan – 31 Dec.