Weather in Chiang Mai 🇹🇭
Monthly weather averages & travel planning
December
Avg Temp
27°C
Rain Days
2 days
Sun Hours
10 hrs
Humidity
78%
Asia › 🇹🇭 Thailand › Chiang Mai
Updated: March 2026
Is December a Good Time to Visit Chiang Mai?
8/10
Excellent
December is a excellent time to visit Chiang Mai (8/10). With 10 daily sunshine hours and only 2 rain days, this month delivers genuinely reliable outdoor conditions, ranking it 8th sunniest of the year in Chiang Mai. Beach and outdoor-focused visitors will find December ideal, though hotel prices reflect demand and popular sites get crowded by mid-morning. January offers a similar profile at lower hotel rates if dates are flexible. The main practical note: Chiang Mai's popular sites are busiest between 10am and 3pm regardless of season. Arriving at opening time or after 4pm makes a significant difference to the experience. Planning tips: book accommodation at least 6-8 weeks ahead, as popular hotels fill quickly during December. Purchasing skip-the-line tickets for major attractions in advance saves meaningful time. If you have flexibility, arriving a few days before or after peak weekends reduces both crowds and prices noticeably.
vs November:28°C avg high
Chiang Mai's December climate peaks at 27°C each afternoon before cooling to 16°C overnight. 10 daily sunshine hours and just 2 wet days mean the odds of a fine day are solidly in your favour. It is an excellent window for outdoor itineraries.
27°C
81°F
Avg High
16°C
61°F
Avg Low
2 days
12 mm total
Rain Days
10h
per day avg
Sunshine
78%
Humid
Humidity
Temperature in Chiang Mai in December
The 11°C day-night temperature range is typical for continental climates: a light jacket in the morning that you shed by midday and need again after sunset. At 78% humidity, the 27°C daytime high feels 2-4°C warmer in practice: quick-dry fabrics and shade-seeking between noon and 3pm are the sensible response. The UV index of 3 is low, meaning sun exposure is minimal concern and sunscreen is largely optional. Winds are calm at an average 7 km/h, so wind-chill is not a factor in planning your clothing. In Fahrenheit: 81°F average high, 61°F overnight low. Data sourced from Open-Meteo ERA5 climate reanalysis (1991–2020 normals).
Temperature Trends
High
Low
Rainfall (mm)
0-20 mm21-50 mm51-100 mm100+ mm
What to Wear in Chiang Mai in December
Morning16°CBefore the day warms up
Afternoon27°CPeak daytime temperature
Evening19°CAfter sunset cools down
Packing for Chiang Mai in December means dressing for 27°C days and 16°C evenings. A light cotton tee with a casual overshirt works well at 27°C, the overshirt doubles as a layer for air-conditioned venues. Evenings drop 11°C to around 16°C, a notable shift that catches underprepared visitors off guard. Pack a dedicated evening layer. Comfortable walking trainers are the versatile choice for both outdoor sightseeing and indoor venues. For temple and religious site visits, carry a lightweight scarf or sarong to cover shoulders and knees, required at most major sites across the region. At 78% average humidity, quick-dry synthetic or bamboo fabrics dry overnight and stay comfortable longer than cotton.
Local tip: Temple and religious site visits require covered shoulders and knees in most of Chiang Mai's heritage areas. A lightweight scarf or sarong weighs almost nothing and solves the problem instantly.
Events in Chiang Mai in December
December has no major festivals or public holidays in Chiang Mai, which is one of its practical advantages for independent travellers. Attractions run at lower capacity than during peak event periods, queues are shorter, and accommodation is easier to find without needing to book many months in advance. Local restaurants, markets, and transport operate at a relaxed pace, making this an ideal time for visitors who prefer a more authentic, unhurried experience of everyday city life rather than large crowds drawn in by a single major headline event.
What to Pack for Chiang Mai in December
Based on 27°C average highs and 2 rainy days
- Light layers for morning and evening
- Breathable T-shirts and comfortable trousers
- UV-protective sunglasses
- Quick-dry travel towel
- Anti-chafe balm for long walking days
- Moisture-wicking synthetic fabrics for active days
- SPF 30+ sunscreen
- Comfortable walking shoes (a second pair lets the first air out overnight)
- Universal travel adapter
- Small day pack for city exploration
- Reusable water bottle
Best Activities in Chiang Mai in December
- Explore outdoor markets and street food stallsMid-morning (10am-12pm)At 27°C, the temperature is ideal for extended walking without overheating
- Guided walking tour of the historic centreMorning or late afternoonComfortable temperatures allow several hours on foot without fatigue
- Visit rooftop viewpoints and observation decksGolden hour (1 hour before sunset)Warm clear evenings provide exceptional visibility for panoramic photography
- Day trip to the surrounding countryside or coastFull day (depart by 8am)December is reliably dry enough for rural day trips without weather risk
- Afternoon in a world-class museum or galleryAfternoon (2-5pm)Pairs well with outdoor morning activities and provides a mid-day rest from sightseeing
- Coffee-house or traditional cafe culture experienceMid-morning or post-lunchA cultural ritual in this region that rewards slow appreciation regardless of weather
- Evening live music, theatre, or opera performanceEvening shows typically at 7-9pmConsistent evening temperatures make getting to and from evening venues comfortable
- Visit the main botanical garden or city park at seasonal peakYear-round; best light in morningDecember brings distinct seasonal changes to public green spaces worth exploring
- Seek out chilled local specialities: cold-brew tea, ice desserts, or chilled seafood at street-level stallsAny time; most atmospheric in evening marketsHot-weather street food culture peaks in December, with vendors setting up specifically for warm evenings
Why is Chiang Mai warm in December?
In December, Chiang Mai sits in the dry season corridor, as the ITCZ shifts away from the region and trade winds bring drier, more stable air. This produces reliably sunny days reaching 27°C, with lower humidity than the wet months. Overnight lows of 16°C offer a pleasant reprieve from the midday heat. Climate data: Open-Meteo ERA5 (1991–2020).
Sunshine Hours
The average number of hours per day with direct sunlight. Calculated from satellite measurements. Days with more than 7 hours of sunshine are ideal for outdoor activities. Under 3 hours means overcast conditions dominate.
UV Index
A scale from 0-11+ measuring ultraviolet radiation intensity. UV 0-2: Minimal risk. UV 3-5: Moderate, wear sunscreen. UV 6-7: High, hat and SPF 30+ essential. UV 8-10: Very High, limit midday exposure. UV 11+: Extreme, seek shade between 10am-4pm.
Rain Days
A rain day is counted when precipitation exceeds 0.1mm. This threshold captures even light drizzle. Unlike total rainfall in mm, rain days tells you how often you might need an umbrella, which is useful for planning outdoor activities.
Humidity
Relative humidity as a percentage. Below 40%: Dry, skin and throat may feel parched. 40-60%: Comfortable, ideal for most people. 60-80%: Sticky, light breathable fabrics recommended. Above 80%: Muggy, heat feels more intense; quick-dry clothing is essential.
Frequently Asked Questions
Chiang Mai in December
In December, Chiang Mai experiences average highs of 27°C (81°F) and lows of 16°C (61°F). Expect around 2 rainy days and 10 hours of sunshine per day, with humidity averaging 78%. The 11°C gap between daytime and overnight temperatures is worth planning around: light layers work for most visitors during the day, but an overshirt or cardigan handles the cooler evenings. UV exposure is moderate at index 3.
Chiang Mai typically sees 2 rainy days in December, with total precipitation of around 12mm. This makes December one of the drier months of the year, and a reliable window for outdoor sightseeing and day trips. Rain showers tend to be brief when they do occur. For context, the driest month in Chiang Mai typically sees 4-6 fewer rain days than December.
Pack light layers, a light jacket for evenings, comfortable walking shoes, and sunscreen for Chiang Mai in December. Daytime temperatures of 27°C are pleasant, but the evening drop to 16°C means a jacket is essential if you plan to be out after dark. Rain is infrequent with only 2 wet days, so a light rain layer is optional. Comfortable walking shoes are a priority given the amount of ground most visitors cover.
Yes, December is an excellent time to visit Chiang Mai. With 10 daily sunshine hours and only 2 rainy days, conditions are ideal for sightseeing and outdoor activities. Temperatures averaging 27°C during the day are comfortable for long walks and outdoor dining. This is peak travel season, so booking accommodation in advance and arriving at popular attractions early in the morning helps avoid the busiest periods.
The average high temperature in Chiang Mai in December is 27°C (81°F), and the average low is 16°C (61°F). The mean daily temperature is approximately 22°C (71°F). The day-to-night range of 11°C is moderate, meaning a single light jacket covers most situations. These are 30-year climate normals based on the 1991 to 2020 reference period; individual years will vary, particularly in transitional months like spring and autumn.
The best month to visit Chiang Mai is generally February. February offers the most sunshine at 11 hours per day and only 1 rainy days. Average temperatures reach 31°C, making it comfortable for sightseeing, outdoor dining, and exploring the city. If your travel dates are flexible, planning your trip around February gives you the best chance of dry, bright weather.
December is shoulder or low season in Chiang Mai, meaning fewer tourists and generally lower prices than peak months. With 10 sunshine hours and 2 rainy days, the weather is less of a draw for mass tourism. This is an advantage for travellers who prefer a quieter, more relaxed experience with shorter queues and easier accommodation availability.
In December, Chiang Mai suits a range of activities thanks to mild temperatures around 27°C. With few rainy days, outdoor activities are highly recommended. Top options include exploring historic neighbourhoods, visiting museums and galleries, local food markets, and day trips to surrounding areas. With 10 hours of sunshine, parks and waterfront walks are particularly enjoyable.
December ranks 8th sunniest of the year in Chiang Mai, with an average 10 daily sunshine hours. The driest months are January, February, and March. April is the hottest month (36°C avg high); December is the coolest (27°C). From here, temperatures rise 1°C into January. Compared to last month (November: 28°C high, 4 rain days), December is cooler and drier. December sits in the middle of the annual sunshine ranking for Chiang Mai, offering a reasonable balance of good weather and manageable crowds.
Year-Round Climate
| Month | High | Low | Rain Days | Sun | Details |
|---|---|---|---|---|---|
| January | 28°C | 16°C | 1 | 10h | View |
| February | 31°C | 18°C | 1 | 11h | View |
| March | 34°C | 21°C | 2 | 11h | View |
| April | 36°C | 24°C | 5 | 11h | View |
| May | 33°C | 24°C | 14 | 10h | View |
| June | 31°C | 24°C | 20 | 9h | View |
| July | 30°C | 24°C | 23 | 7h | View |
| August | 29°C | 23°C | 25 | 7h | View |
| September | 29°C | 23°C | 24 | 8h | View |
| October | 29°C | 21°C | 16 | 10h | View |
| November | 28°C | 18°C | 4 | 10h | View |
| December | 27°C | 16°C | 2 | 10h | View |
January
1 rain days, 10h sun
28°16°
February
1 rain days, 11h sun
31°18°
March
2 rain days, 11h sun
34°21°
April
5 rain days, 11h sun
36°24°
May
14 rain days, 10h sun
33°24°
June
20 rain days, 9h sun
31°24°
July
23 rain days, 7h sun
30°24°
August
25 rain days, 7h sun
29°23°
September
24 rain days, 8h sun
29°23°
October
16 rain days, 10h sun
29°21°
November
4 rain days, 10h sun
28°18°
December
2 rain days, 10h sun
27°16°
Other Months in Chiang Mai
Plan Your Trip to Chiang Mai
Nearby Destinations
Cities within 500 km with comparable weather conditions
Data Sources for Chiang Mai
Climate normals represent 30-year averages (1991-2020). Individual years may vary.