Last updated: August 27, 2025
In December, Chiang Mai, Thailand, experiences a delightful blend of warm days and cool nights, with maximum temperatures reaching up to 33°C (91°F) and an average of 21°C (71°F). The nights can be refreshingly chilly, dipping to a minimum of 6°C (43°F), perfect for cozying up under blankets. While the month sees only 13 mm (0.5 in) of rain across just 1 day, humidity levels hover around 56%, adding a pleasant feel to the winter air. This ideal combination of crisp mornings and warm afternoons makes December a favorite time for travelers to explore the beauty of Chiang Mai.
In December, Chiang Mai experiences a refreshing drop in temperatures, with nightly lows dipping to a crisp 6°C (43°F). As the month progresses, the days remain pleasantly mild, with an average temperature of 21°C (71°F) and highs reaching around 33°C (91°F). This transition marks a significant shift from the sweltering heat of earlier months like April and May, where temperatures soar beyond 40°C (104°F). The coolness of December makes it an ideal time for exploring the city's rich cultural heritage and vibrant outdoor markets, offering a delightful contrast to the bustling energy of Thailand's warmer months.
In December, Chiang Mai experiences a notable decrease in precipitation, receiving just 13 mm (0.5 in) of rain over a single day. This marks a significant shift after the rainy months of July and August, where the city is drenched with an average of 268 mm (10.5 in) across 26 days. The dry spell continues through to February, with minimal rainfall recorded, highlighting a trend towards a cooler, drier period that characterizes the end of the year. As the festive season arrives, visitors can enjoy the beautiful landscape and pleasant weather, a welcome change after the monsoon's peak in the mid-year.
In Chiang Mai, Thailand, the humidity levels ebb and flow throughout the year, creating a dynamic climate experience for residents and visitors alike. Starting the year with a comfortable 51% in January, humidity begins to dip further in February, reaching a low of 46% by mid-winter. As the months progress into the scorching heat of April, humidity remains at its lowest point, peaking at just 36%. However, May brings a significant shift as the rains arrive, with humidity rising dramatically to 63%. This upward trend continues into the summer months, culminating in a peak of 91% in August. As the wet season winds down, humidity begins to decrease, leading to a modest 56% in December. Overall, December serves as a transitional month, where the lingering moisture from the monsoon starts to wane, providing a pleasant respite before the drier months ahead.
In December, Chiang Mai sees a UV Index of 8, categorized as very high. This is a slight decrease from the extreme levels observed in the earlier months, such as May through October, which maintained an index of 14 and a burn time of just 10 minutes. Even with the drop, sun protection remains essential, as the 15-minute burn time signals that prolonged sun exposure can still result in skin damage. Visitors should stay vigilant against UV rays, especially during outdoor activities. To learn more about the UV levels throughout the year, check out Chiang Mai UV Index.
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As December unfolds in Chiang Mai, Thailand, the city basks in a delightful 306 hours of sunshine, marking a significant elevation from the cloudier months of the rainy season. This cheerful increase in daylight follows a steady upward trend noticeable from the previous months, where daylight hours generally peaked in the heart of summer with 338 hours in March and remained generous throughout the year. The clear skies of December are particularly inviting, providing a charming backdrop for exploration in this historical city. Visitors can revel in the pleasant warmth as they soak up the sun, celebrating the festive season with numerous outdoor activities amidst the scenic beauty of northern Thailand. With December's sunshine invitingly consistent, it's a perfect time to immerse oneself in the vibrant culture and breathtaking landscapes.
In December, Chiang Mai enjoys a delightful return to sunny skies, with a 76% chance of sunshine, comparable to the beginning of the year. This month marks a significant shift from the wet season, where the likelihood of sun drops sharply to as low as 11% during the height of the rainy months from June to August. Following this pattern, the chance of sunny days gradually improves through November, climbing to 54%, before reaching a peak in December, reflecting that the transition to the dry season is in full swing. As visitors flock to the city for its cool temperatures and vibrant festivals, they can expect a wonderful opportunity to soak up the sun and enjoy the stunning landscapes of this enchanting region.
In Chiang Mai, Thailand, December brings a return to a steady rhythm of daylight, with 11 hours of sun illuminating the landscape, just like in January and February. The daylight duration gradually increases from the 11 hours at the start of the year, reaching a peak of 13 hours during the lush months of May to July. As the year winds down, the daylight begins to fade back, settling into a familiar pattern that offers a comforting consistency throughout the cooler month of December. This cyclical dance of daylight not only marks the changing seasons but also invites both locals and travelers alike to enjoy the serene beauty of Chiang Mai’s countryside and vibrant city life under the soft glow of the sun.
In December, the winds in Chiang Mai whisper softly at an average speed of 1.2 m/s (3 mph), maintaining a gentle consistency that characterizes the region's calm winter months. This slight uptick from November's lull, where winds slowed to 1.0 m/s, embodies the subtle transition as the cool air envelops the city. Throughout the year, Chiang Mai experiences only minimal fluctuations in wind speed, largely hovering around the 1.2-1.4 m/s range from June to April. This serene atmosphere not only enhances the picturesque surroundings but also complements the vibrant cultural landscape, making December an ideal time for visitors to immerse themselves in the tranquil charm of the city.
Weather in Chiang Mai varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Chiang Mai, focusing on differences in temperature, rainfall, humidity, and UV levels.
In December, Chiang Mai experiences a temperature range from a minimum of 6°C (43°F) to a maximum of 33°C (91°F), with an average temperature of 21°C (71°F). The month sees minimal precipitation, with just 13 mm (0.5 in) over 1 day, and humidity levels at 56%. In contrast, January's weather is slightly warmer, with a minimum temperature of 10°C (51°F) and a maximum of 34°C (93°F), yielding an average of 22°C (72°F). Precipitation decreases to 10 mm (0.4 in) over 2 days, and humidity drops to 51%. For a more detailed look at January weather in Chiang Mai, visit Chiang Mai weather in January.
December weather in Chiang Mai features a comfortable range of temperatures, with a minimum of 6°C (43°F) and an average high reaching 33°C (91°F). The month experiences relatively low precipitation, with only 13 mm (0.5 in) and humid conditions at 56%. In contrast, February sees warmer temperatures, where the minimum rises to 11°C (53°F) and the average peak climbs to 36°C (97°F). February is even drier, with only 2 mm (0.1 in) of precipitation and remarkably lower humidity at 46%. For a detailed look at what to expect, you can check out Chiang Mai weather in February.
December and March in Chiang Mai present notably different weather conditions. December features milder temperatures, with daily averages ranging from a minimum of 6°C (43°F) to a maximum of 33°C (91°F), coupled with a relatively higher humidity of 56% and minimal precipitation. In contrast, March experiences warmer temperatures, with an average ranging from 16°C (60°F) at night to highs of 40°C (104°F) during the day, while humidity drops to 38% and precipitation is almost nonexistent. For more detailed information, you can check Chiang Mai weather in March.
In December, the weather tends to be more mild, with temperatures ranging from a minimum of 6°C (43°F) to a maximum of 33°C (91°F), and an average of 21°C (71°F). There is minimal rainfall, only about 13 mm (0.5 in) over just one day, resulting in relatively higher humidity at 56%. In contrast, April experiences much warmer temperatures, with a minimum of 18°C (65°F) and maximums soaring up to 42°C (107°F), averaging around 29°C (85°F). Additionally, April sees significantly more precipitation at 42 mm (1.7 in) spread over six days, but with lower humidity levels of 36%. For more details, check out Chiang Mai weather in April.
In comparing the weather between December and May, December offers milder temperatures with a minimum of 6°C (43°F) and an average of 21°C (71°F), peaking at 33°C (91°F). It experiences relatively low precipitation, averaging just 13 mm (0.5 in) over a single rainy day, accompanied by a moderate humidity level of 56%. In contrast, May sees significantly warmer conditions, with a minimum temperature of 23°C (73°F) and an average of 30°C (86°F), reaching highs of 41°C (106°F). Rainfall increases dramatically to 82 mm (3.2 in) over approximately nine days, and humidity rises to 63%. For a more detailed understanding of these conditions, you can explore Chiang Mai weather in May.
December and June showcase distinctly different weather patterns. In December, temperatures range from a mild 6°C (43°F) at night to a warm 33°C (91°F) during the day, with average temperatures around 21°C (71°F). Rainfall is minimal, with only 13 mm (0.5 in) occurring over just one day and humidity at a comfortable 56%. Conversely, June experiences much warmer conditions, with overnight lows at 23°C (74°F), daytime highs reaching up to 40°C (104°F), and an average of 29°C (84°F). This month sees significant rainfall, accumulating to 145 mm (5.7 in) over 17 days, and higher humidity levels at 81%. For more insights into the weather during this month, visit Chiang Mai weather in June.
December and July offer contrasting weather experiences. In December, temperatures range from a mild 6°C (43°F) at night to a warm average of 21°C (71°F) during the day, peaking at 33°C (91°F). Precipitation is minimal, with only 13 mm (0.5 in) falling over just one day, and humidity is a comfortable 56%. In stark contrast, July sees much hotter conditions, with nighttime lows of 23°C (73°F) and daytime highs that can reach up to 40°C (104°F), averaging around 28°C (83°F). This month is also marked by significant rainfall, with 218 mm (8.6 in) spread over 22 days, contributing to a higher humidity level of 83%. For more details on this rainy season, check out Chiang Mai weather in July.
In comparing the weather of December and August, a stark contrast emerges. December boasts pleasant temperatures, with a minimum of 6°C (43°F) and an average of 21°C (71°F), peaking at a comfortable 33°C (91°F). The month experiences minimal precipitation, averaging only 13 mm (0.5 in) over just one day and maintaining a moderate humidity of 56%.
In contrast, August is characterized by warmer temperatures, with a minimum of 23°C (73°F) and an average of 27°C (81°F), reaching highs of 36°C (97°F). However, it is also the wettest month, receiving a staggering 268 mm (10.5 in) of rainfall distributed over 26 days, coupled with high humidity at 91%.
For more details on the weather conditions specific to this month, visit Chiang Mai weather in August.
December and September in Chiang Mai present contrasting weather patterns that highlight the region's seasonal variations. In December, temperatures range from a mild minimum of 6°C (43°F) to a comfortable maximum of 33°C (91°F), with an average of 21°C (71°F). The month sees minimal rainfall, totaling just 13 mm (0.5 in) over a single day and a humidity level of 56%. In stark contrast, September experiences much warmer conditions, with temperatures ranging from a minimum of 22°C (71°F) to a high of 35°C (95°F), averaging 27°C (81°F). This month is characterized by significantly higher precipitation, with a whopping 198 mm (7.8 in) spread over 21 days, and a higher humidity level of 83%. For more details on September weather, check out Chiang Mai weather in September.
In comparing the weather between December and October, it's evident that December offers milder temperatures with a minimum of 6°C (43°F) and a maximum of 33°C (91°F), providing an average of 21°C (71°F). This month experiences significantly less precipitation, with only 13 mm (0.5 in) falling across just one day, and the humidity stands at a comfortable 56%. In contrast, October is much warmer, with temperatures ranging from a minimum of 20°C (69°F) to a maximum of 34°C (94°F), averaging 26°C (80°F). However, it also brings much higher rainfall, accumulating 156 mm (6.1 in) over 18 days, contributing to a humidity level of 67%. For more detailed insights into the October weather, you can check Chiang Mai weather in October.
In comparing the weather of December to November, December experiences a broader range of temperatures, with a minimum of 6°C (43°F), an average of 21°C (71°F), and a maximum of 33°C (91°F). In contrast, November is slightly warmer overall, with a minimum of 13°C (56°F), an average of 25°C (77°F), and a maximum reaching 34°C (93°F). Precipitation in December is significantly lower, with only 13 mm (0.5 in) over just one day, while November sees more rainfall at 24 mm (0.9 in) spread across five days. Humidity levels also differ slightly, with December averaging 56% compared to November's 60%. For more information, visit Chiang Mai weather in November.
In December, Chiang Mai offers a delightful reprieve from the warmer months, with pleasantly mild temperatures that make exploring the city a joy. With an average temperature of 21°C (71°F), this month feels refreshingly cool, especially in the evenings when temperatures can dip to around 6°C (43°F). Unlike the rain-soaked monsoon season, December ushers in clear skies with minimal precipitation, allowing visitors to fully enjoy outdoor activities. The humidity remains relatively moderate at 56%, adding to the comfortable atmosphere. For anyone looking to experience the beauty of Chiang Mai's landscapes and cultural richness, December stands out as an ideal time to visit. For more insights on the region's climate, visit Chiang Mai Climate.