Chiang Mai weather in December
Monthly temperatures, rain, humidity, what to wear and what to pack — 2024–2025 historical average
Chiang Mai December weather at a glance
In December, Chiang Mai averages 22.7°C, with typical highs of 27.9°C and lows of 18.1°C. The historical average is 3 wet days and 75% humidity.
Chiang Mai December temperature & humidity
Chiang Mai December rain & wet days
Pack a compact umbrella. Keep an indoor stop available between outdoor activities.
What to wear in Chiang Mai in December
Choose breathable summer clothes and pack sun protection.
- DaytimeBreathable short sleeves, hat and sunscreen · average high 27.9°C
- Morning & eveningLight layer for air-conditioned rooms · average low 18.1°C
- FootwearComfortable walking shoes; quick-dry footwear for rainy days.
Packing essentials
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Chiang Mai December sunrise & sunset times
2026 December · Local time (Asia/Bangkok)
| Date | Sunrise | Sunset | Daylight |
|---|---|---|---|
| 2026-12-01 | 06:40 | 17:46 | 11h 5m |
| 2026-12-15 | 06:49 | 17:49 | 11h 1m |
| 2026-12-31 | 06:56 | 17:58 | 11h 1m |
For sunset photos, arrive before the listed sunset time. Clouds, mountains and buildings can change when the sun becomes visible or disappears.
Calculated for the city coordinates with daylight saving applied. SunCalc · tz-lookup
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Chiang Mai rainy season & dry season
Is December wet or dry?
Thailand’s southwest monsoon generally brings rain from mid-May to mid-October. The southern east coast also receives northeast-monsoon rain, so Koh Samui and Phuket do not share one wet/dry-season calendar. The 2024–2025 average for December is 3 wet days.
2024–2025 wet-day averages, not long-term season boundaries. Wet days do not mean all-day rain.
Packing for rainy and dry periods
For rainy periods, bring a light rain jacket, a waterproof pouch and quick-dry clothes. In drier months, pack sunscreen and a hat, plus a compact umbrella for showers. For beach trips, check the boat operator’s weather and cancellation notices.
Season guide: Thailand Government
Chiang Mai travel essentials
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Best months to visit Chiang Mai
Bar height shows our simple weather-comfort score, not a safety rating; colour shows temperature.
December weather by year
Daily weather in 2025
Daily high and low temperatures; blue labels show precipitation
Frequently asked questions
What is Chiang Mai weather like in December?
In December, Chiang Mai averages 22.7°C, with typical highs of 27.9°C and lows of 18.1°C. The historical average is 3 wet days and 75% humidity. Our weather-comfort rating for this month is excellent.
Does it rain a lot in Chiang Mai in December?
There are about 3 wet days in December. A compact umbrella is still useful.
What should I wear in Chiang Mai in December?
Choose breathable summer clothes and pack sun protection.
What are the best months to visit Chiang Mai?
Recent weather data rates January, February, March, November among the more comfortable months.
Where can I check Chiang Mai weather in December in real time?
Check local webcams for the view right now and a local weather service for today’s forecast. Monthly temperatures here are historical averages.
Is December rainy or dry season in Chiang Mai?
Thailand’s southwest monsoon generally brings rain from mid-May to mid-October. The southern east coast also receives northeast-monsoon rain, so Koh Samui and Phuket do not share one wet/dry-season calendar. The 2024–2025 average for December is 3 wet days.
Which months have fewer rainy days in Chiang Mai?
In our 2024–2025 data, February, March, December have the fewest wet days. These are recent observations, not long-term climate normals. Compare temperatures and your planned activities as well.
What time are sunrise and sunset in Chiang Mai in December?
On 2026-12-15, calculated sunrise is 06:49 and sunset is 17:49 in local time (Asia/Bangkok). Times vary by date and terrain.
Chiang Mai weather by month
More Southeast Asia destinations in December
Open-Meteo (CC BY 4.0) · 2024–2025 historical data, aggregated and rounded by this site. Not a forecast or long-term climate normal. Calculation method and limitations