Thailand Chiang Rai Weather in December — Climate Guide
December in Chiang Rai is very-high
Chiang Rai Weather in December — Quick Answer
As of 2026- Avg temp
- 27° / 14°
- Rainfall
- 15mm · 2 days
- Crowds
- Very busy
As of 2026, Chiang Rai in December averages a high of 27°C and low of 14°C with 15mm of rain over about 2 days. Peak cool-dry season. Warm, sunny days (27°C) and cold nights (14°C, single digits in the hills). Light clothing for the day plus a proper jacket or fleece for the evening — December nights are the coolest of the year.
December is very-high for Chiang Rai.
December is peak season and one of the very best months — clear, dry, and the coolest of the year, with warm sunny days (27°C) and genuinely cold nights (14°C in the city, single digits up in the hills). Rainfall is minimal and skies are crystal clear.
This is prime time for everything that makes Chiang Rai special: the temples gleam in the clear light, the Golden Triangle and Mekong are at their most photogenic, and the tea plantations, Doi Tung, and Mae Salong reward the cool-season clarity with long mountain views. The crisp hill mornings are a treat after Thailand's usual heat.
Travel score
Chiang Rai December Weather Stats
Avg High
27°C
Avg Low
14°C
Rainy Days
2
15mm total
Sunshine
8.5h
Daily avg
Humidity
68%
comfortable
UV Index
7
High
Wind
6 km/h
Gusts 14
Crowds
Very busy
At attractions
December Sunrise & Sunset
Air Quality
PM2.5
26 μg/m³
PM10
44 μg/m³
Status
moderate
Feels-Like Temperature & Wind
Feels like
Daytime
28°C
Nighttime
12°C
Humidity and wind affect how the actual temperature feels.
Wind
6 km/h
Max gust 14 km/h
Activities Recommended for December
December Travel Pros & Cons
Pros
- Clearest skies and coolest, most comfortable weather
- Best mountain and tea-country views of the year
- No rain, clean air
- Crisp, pleasant hill mornings
Cons
- Busiest and most expensive month (peaks at New Year)
- Cold nights surprise the unprepared
- Book hotels well ahead
- White Temple crowded by mid-morning
December Events & Festivals
- Peak cool-dry season — clearest skies, coolest nights
- Year-end and New Year holiday travel
- Best mountain and tea-country views
- Cold mornings in the hills
Chiang Rai in December — Full Picture
December is peak season and one of the very best months — clear, dry, and the coolest of the year, with warm sunny days (27°C) and genuinely cold nights (14°C in the city, single digits up in the hills). Rainfall is minimal and skies are crystal clear.
This is prime time for everything that makes Chiang Rai special: the temples gleam in the clear light, the Golden Triangle and Mekong are at their most photogenic, and the tea plantations, Doi Tung, and Mae Salong reward the cool-season clarity with long mountain views. The crisp hill mornings are a treat after Thailand's usual heat.
It's also the busiest and priciest stretch, peaking over the year-end and New Year holidays. Book hotels well ahead (the limited riverside resorts especially), and arrive early at the White Temple before the tour buses. The cold can surprise visitors expecting tropical warmth — the hills in particular get properly chilly after dark.
Pack light daytime clothing plus a real jacket or fleece for the cold evenings, and warmer layers for any hill excursions. For clear views and comfortable sightseeing, December is hard to beat.
What to Wear & What to Pack
Peak cool-dry season. Warm, sunny days (27°C) and cold nights (14°C, single digits in the hills). Light clothing for the day plus a proper jacket or fleece for the evening — December nights are the coolest of the year.
Packing Checklist
Seasonal Weather Overview
Spring (Mar·Apr·May)
34.3°C
21°C
7.7/mo
Summer (Jun·Jul·Aug)
31.7°C
23°C
19/mo
Autumn (Sep·Oct·Nov)
30.3°C
20°C
12/mo
Winter (Dec·Jan·Feb)
Current28.7°C
14.7°C
1.3/mo
Chiang Rai Monthly Weather Comparison
| Month | High | Low | Rain | Sun | Humid | UV | Crowd | Price |
|---|---|---|---|---|---|---|---|---|
| January (Best) | 28° | 14° | 1d·10mm | 9h | 65% | 8 | Very busy | Peak |
| 31° | 16° | 1d·10mm | 9h | 60% | 9 | Busy | Peak | |
| 34° | 18° | 2d·20mm | 8h | 55% | 10 | Quiet | Low season | |
| 36° | 22° | 5d·60mm | 8h | 60% | 11 | Moderate | Shoulder | |
| 33° | 23° | 16d·200mm | 6.5h | 75% | 9 | Quiet | Low season | |
| 32° | 23° | 17d·160mm | 5.5h | 78% | 9 | Quiet | Low season | |
| 32° | 23° | 19d·190mm | 5h | 80% | 9 | Quiet | Low season | |
| 31° | 23° | 21d·230mm | 4.5h | 82% | 8 | Quiet | Low season | |
| 31° | 22° | 20d·215mm | 5h | 82% | 8 | Quiet | Low season | |
| 31° | 21° | 12d·110mm | 6.5h | 78% | 8 | Moderate | Shoulder | |
| November (Best) | 29° | 17° | 4d·40mm | 8.5h | 70% | 8 | Busy | Peak |
| December (Best) | 27° | 14° | 2d·15mm | 8.5h | 68% | 7 | Very busy | Peak |
View Other Months
Chiang Rai December Hotel Picks
Frequently Asked Questions
Is December a good time to visit Chiang Rai?
Chiang Rai in December is very-high. Tourist crowds are very busy and flight/hotel prices are peak.
What's the average temperature in Chiang Rai in December?
Chiang Rai December averages a high of 27°C and a low of 14°C.
Does it rain much in Chiang Rai in December?
Chiang Rai December averages 15mm of rainfall over about 2 rainy days.
What should I wear in Chiang Rai in December?
Peak cool-dry season. Warm, sunny days (27°C) and cold nights (14°C, single digits in the hills). Light clothing for the day plus a proper jacket or fleece for the evening — December nights are the coolest of the year.
What time are sunrise and sunset in Chiang Rai in December?
Chiang Rai December sunrise is 06:40 and sunset is 17:55, with 11h 15min of daylight.
What's the air quality like in Chiang Rai in December?
Chiang Rai December air quality (AQI) averages 52, rated Moderate. PM2.5 averages 26μg/m³.
What activities are recommended in Chiang Rai in December?
In December, Chiang Rai is great for The three signature temples, Golden Triangle + Mekong boat ride, Tea country, Doi Tung, and Mae Salong.
Is December peak season in Chiang Rai?
Chiang Rai December crowds are very busy and prices are peak. Advance reservations are strongly recommended.
Best Months to Visit Chiang Rai
View Other Months
Planning a December trip to Chiang Rai?
You've checked the weather — next come the budget and the route.
Why you can trust weather guide
Based in Chiang Mai for 8+ years, with 30+ countries visited across Southeast Asia, Japan, and Europe. Every detail in this guide is primary-source verified as of April 2026, with prices auto-refreshed via live exchange rate APIs. This isn't AI-generated boilerplate — it's written from the perspective of someone who has actually been there.