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Contents
- The climate of Chiang Mai
- The best time to visit Chiang Mai
- The worst time to visit Chiang Mai
- Spring weather in Chiang Mai
- Summer weather in Chiang Mai
- Autumn weather in Chiang Mai
- Winter weather in Chiang Mai
- Weather in January
- Weather in February
- Weather in March
- Weather in April
- Weather in May
- Weather in June
- Weather in July
- Weather in August
- Weather in September
- Weather in October
- Weather in November
- Weather in December
- Frequently asked questions
- Average temperature
- Average humidity
- Average rainfall
- Average rainfall days
- Average daylight
- Average sunshine
- Average UV index
Panorama of the fantastic Two Pagoda on top of the Doi Inthanon mountain, in Chiang Mai, Thailand
Climate and monthly weather forecast
The climate of Chiang Mai
Chiang Mai, Thailand, situated on the Ping River, is subject to the Aw, Tropical wet and dry or savanna, Köppen climate classification. Influenced by both monsoons and heat, this city endures a climate that deviates between extremes in temperature, humidity, and rainfall. The yearly swing in these climatological elements is momentous, providing distinct wet and dry periods.
Yearly temperatures in Chiang Mai deviate between 14.9°C (58.8°F) at their coolest in January, reaching pinnacles of up to 36.5°C (97.7°F) by April. Humidity follows a similar gradient, ranging from a low of 52% in March, up to a maximum of 81% between August and September. Rainfall is distinctly seasonal, with minimal amounts registered from 4mm (0.16") to 18mm (0.71"), between January to March, followed by a surge to rainfall levels as high as 217mm (8.54"), notably in August. This rainfall is sustained with visibly extended daylight hours from 12.6 hours in April, to 13.3 hours in June.
Observing sunlight hours unveils that the sunniest period falls between January and March, above 8.6 hours daily, contrasting a relative solar scarcity from June through to September with only 5.2 to 5.5 hours daily. Notably, UV Index readings consistently peak at 12 from March to September. Highlighted by these patterns, Chiang Mai’s climate is characterized by warm, wet summers and milder, dryer winters.
Yearly temperatures in Chiang Mai deviate between 14.9°C (58.8°F) at their coolest in January, reaching pinnacles of up to 36.5°C (97.7°F) by April. Humidity follows a similar gradient, ranging from a low of 52% in March, up to a maximum of 81% between August and September. Rainfall is distinctly seasonal, with minimal amounts registered from 4mm (0.16") to 18mm (0.71"), between January to March, followed by a surge to rainfall levels as high as 217mm (8.54"), notably in August. This rainfall is sustained with visibly extended daylight hours from 12.6 hours in April, to 13.3 hours in June.
Observing sunlight hours unveils that the sunniest period falls between January and March, above 8.6 hours daily, contrasting a relative solar scarcity from June through to September with only 5.2 to 5.5 hours daily. Notably, UV Index readings consistently peak at 12 from March to September. Highlighted by these patterns, Chiang Mai’s climate is characterized by warm, wet summers and milder, dryer winters.
The best time to visit Chiang Mai
Optimally, Chiang Mai should be visited from November to February. During these months, temperatures maintain a comfortable range from 15.7°C (60.3°F) to 30.1°C (86.2°F). Humidity is relatively low, rotating between 73% to 75%. Rainfall is minimal with rates between 16mm (0.63") and 54mm (2.13"), and daylight lasts for approximately 11 to 11.3 hours. Additionally, travelers can enjoy substantial sunshine, averaging from 7.8 to 8.5 hours daily. The UV index ranges from 8 to 9, mitigating the likelihood of sunburn.
The worst time to visit Chiang Mai
The least favorable time to visit Chiang Mai is during the peak monsoon season, spanning from June to September. This period records elevated rainfall, with values towering from 125mm (4.92") in June, up to 217mm (8.54") in August. Humidity peaks to a surging 81%, and daily temperatures still hover between 31.5°C (88.7°F) to 34.2°C (93.6°F). Daily sunshine reduces to its lowest - between 5.2 to 5.9 hours, despite long daylight hours from 12.7 to 13.1 hours. The UV Index maxes out at 12, indicating extreme potential for harm from unprotected sun exposure.
Spring weather in Chiang Mai
Spring, between March and May, in Chiang Mai is intensely hot. March commences with temperatures escalating from 19.5°C (67.1°F) to 35.2°C (95.4°F) and culminates in May with temperatures oscillating from 23.8°C (74.8°F) to 34.2°C (93.6°F). Humidity oscillates from a low 52% in March, gradually ascending to a more noticeable 71% in May. Rainfall begins to increase during this period, moving from 18mm (0.71") in March to a substantial 162mm (6.38") in May. Daily sunshine hours remain constant at 8.6 to 7 hours and daylight periods gradually increase from 12 to 13 hours. UV Index maxes out at 12, indicating a need for suitable sun protection.
Summer weather in Chiang Mai
The summer, June to August, is the wettest season in Chiang Mai with consistent heavy rainfall, peaking at 217mm (8.54") in August. Temperature oscillations remain elevated, between 31.5°C (88.7°F) to 34.2°C (93.6°F). The humidity also reaches its zenith at 81%. Despite the long daylight hours from 13.1 to 12.7 hours, actual sunshine dwindles to 5.5 to 5.2 hours. Additionally, the UV Index maintains its maximum reading of 12, necessitating good sun protection measures.
Autumn weather in Chiang Mai
Autumn, September to November, ushers in a decline in rainfall with values receding from 211mm (8.31") in September to 54mm (2.13") by November. Temperatures cool somewhat, fluctuating from 31.7°C (89.1°F) at the start of the season, easing to 30.1°C (86.2°F) by November. Humidity levels also decrease, reducing from an 81% high in September to 75% by November. Daily sunshine hours progressively increase from 5.2 hours in September to 7.8 hours in November. Daylight hours shorten from 12.2 hours to 11.3 hours, and the UV Index lessens its intensity from 12 to 9.
Winter weather in Chiang Mai
Winter, December to February, welcomes the driest season with rainfall amounting to a minimal 16mm (0.63") in December, increasing slightly to 9mm (0.35") in February. Temperatures soften, varying between 14.9°C (58.8°F) and 32.6°C (90.7°F). Relative humidity remains low, registering 73% to 68%. Winter days offer an abundance of sunshine - from 8.5 to 9 hours and daylight persists for 11 to 11.5 hours. The UV Index lowers to a less harsh 8 to 9 during these months.
Weather in January
Start of the year in Chiang Mai greets residents and visitors with pleasant weather. This month is characterised by dry conditions with a moderate amount of sunshine. With high temperatures slightly below 30°C (86°F), the weather feels comfortable, especially considering the relatively lower humidity of 68%. Weather in January »
Weather in February
February showcases a subtle waning of the cool season in Chiang Mai. It is a month of a sun-filled sky, with temperatures on the rise, compared to January. The rainfall remains low as dry conditions continue, with a relative humidity of 58%, the second lowest in the year. Weather in February »
Weather in March
March in Chiang Mai marks the advent of the hot season, with temperatures distinctly higher than in February. Despite the blazing sun and the intensifying heat, the weather is not excessively humid. The month experiences slightly more rainfall than February, but it remains relatively dry. Weather in March »
Weather in April
April holds the reputation of being the hottest month of the year in Chiang Mai. The temperature peaks, reaching an average high of 36.5°C (97.7°F). Consistent length of daylight hours and an increase in relative humidity from March to 57% create a markedly balmy climate. Weather in April »
Weather in May
Transition into the rainy season begins in May. The temperatures see a slight dip from the scorching highs of April. An abrupt surge in rainfall characterises this month, with 162mm (6.38") falling over 14 days, signalling the end of the hot and dry spell. Weather in May »
Weather in June
In June, Chiang Mai navigates into the wet season in full stride. Although the temperatures stay fairly stable compared to May, the slight fluctuation hardly impacts the humidity level. The city experiences humidity of 77% which is a remarkable jump from the previous months. Weather in June »
Weather in July
July in Chiang Mai features a typical monsoon climate, with high humidity and rainfall. Despite the similar conditions as June, the rainfall shows a gradual rise with an average of 140mm (5.51") over 16 days. The days are a bit shorter than the peak summertime, still providing ample daylight for tourists to explore the city. Weather in July »
Weather in August
August experiences one of the most voluminous and consistent rainfall in Chiang Mai, with 217mm (8.54") spreading over 18 days. The weather, hence, is cooler than the scorching heat of the summer but continues to be humid. The touchdown of heavy showers doesn't drastically decrease the temperatures. Weather in August »
Weather in September
September continues the monsoon trend with high humidity and substantial rain. The rainfall begins to slightly decrease with 211mm (8.31") registering over 20 days. The daylight hours reduce to 12.2, and temperatures remain relatively stable compared to August. Weather in September »
Weather in October
October marks the beginning of the end of the rainy season in Chiang Mai. The city still experiences rainfall, although much less than the heavy deluge in August and September. Temperatures see a minor drop, leading to pleasant weather. Weather in October »
Weather in November
November brings much-awaited relief from the lengthy monsoon as Chiang Mai steps into the cold season. There is a significant fall in rainfall from October to 54mm (2.13"), and humidity substantially lowers. The average temperatures also decrease, creating a cooler atmosphere. Weather in November »
Weather in December
December, the last month of the year, is cool and dry in Chiang Mai. The temperatures drop notably from November, offering a refreshing climax to the year. It experiences the lowest rainfall in the year, only 16mm (0.63") over one day, making it the most appealing time to enjoy outdoor activities. Weather in December »
Updated: Feb 5, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the driest month in Chiang Mai?
January is the month with the least rainfall in Chiang Mai, Thailand. Rain falls for 1 days and accumulates 4mm (0.16") of precipitation.
How much does it rain in Chiang Mai?
Throughout the year, in Chiang Mai, Thailand, there are 113 rainfall days, and 1131mm (44.53") of precipitation is accumulated.
What month has the most sunshine in Chiang Mai?
February has the most sunshine of the year, with an average of 9h of sunshine.
What is the least humid month in Chiang Mai?
The least humid month in Chiang Mai, Thailand, is March, with an average relative humidity of 52%.
What are the months with the highest UV index in Chiang Mai?
March through September, with an average maximum UV index of 12, are months with the highest UV index in Chiang Mai.
What part of the year is the hottest in Chiang Mai?
April brings the highest temperatures in Chiang Mai, with an average high of 36.5°C (97.7°F) and an average low of 22.9°C (73.2°F).
When are the longest days in Chiang Mai?
With an average of 13h and 12min of daylight, June has the longest days of the year in Chiang Mai, Thailand.
What are the most humid months in Chiang Mai?
The months with the highest humidity are August and September, with an average relative humidity of 81%.
What is the wettest month in Chiang Mai?
The month with the most rainfall in Chiang Mai, Thailand, is August, when the rain falls for 18 days and typically aggregates up to 217mm (8.54") of precipitation.
What is the month with the least sunshine in Chiang Mai?
August and September, with an average of 5.2h of sunshine, are months with the least sunshine.
What time of the year is the coldest in Chiang Mai?
December proves to be the coldest month, recording an average maximum temperature of 28.6°C (83.5°F) and a minimum temperature of 15.7°C (60.3°F).
What is the month with the shortest days in Chiang Mai?
With an average of 11h and 0min of daylight, December has the shortest days of the year in Chiang Mai.
Is there Daylight Saving Time (DST) in Chiang Mai?
Chiang Mai, Thailand, does not observe Daylight Saving Time (DST). +07 timezone is used over the entire year.
When is the lowest UV index in Chiang Mai?
With an average maximum UV index of 8, December is the month with the lowest UV index.
Average temperature
Chiang Mai, Thailand
The warmest month (with the highest average high temperature) is April (36.5°C).
The month with the lowest average high temperature is December (28.6°C).
The month with the highest average low temperature is June (24°C).
The coldest month (with the lowest average low temperature) is January (14.9°C).
Average humidity
Chiang Mai, Thailand
The months with the highest relative humidity are August and September (81%).
The month with the lowest relative humidity is March (52%).
Average rainfall
Chiang Mai, Thailand
- Average rainfall in January:
4.2mm - Average rainfall in February:
8.9mm - Average rainfall in March:
17.8mm - Average rainfall in April:
57.3mm - Average rainfall in May:
162mm - Average rainfall in June:
124.5mm
- Average rainfall in July:
140.2mm - Average rainfall in August:
216.9mm - Average rainfall in September:
211.4mm - Average rainfall in October:
117.6mm - Average rainfall in November:
53.9mm - Average rainfall in December:
15.9mm
The wettest month (with the highest rainfall) is August (216.9mm).
The driest month (with the least rainfall) is January (4.2mm).
Average rainfall days
Chiang Mai, Thailand
- Average rainfall days in January:
1 days - Average rainfall days in February:
2 days - Average rainfall days in March:
2 days - Average rainfall days in April:
6 days - Average rainfall days in May:
14 days - Average rainfall days in June:
14 days
- Average rainfall days in July:
16 days - Average rainfall days in August:
18 days - Average rainfall days in September:
20 days - Average rainfall days in October:
14 days - Average rainfall days in November:
5 days - Average rainfall days in December:
1 days
The month with the highest number of rainy days is September (20 days).
The months with the least rainy days are January and December (1 days).
Average daylight / Average sunshine
Chiang Mai, Thailand
- Average daylight in January:
11h and 1min - Average daylight in February:
11h and 3min - Average daylight in March:
12h and 0min - Average daylight in April:
12h and 4min - Average daylight in May:
13h and 0min - Average daylight in June:
13h and 1min
- Average daylight in July:
13h and 1min - Average daylight in August:
12h and 5min - Average daylight in September:
12h and 1min - Average daylight in October:
11h and 4min - Average daylight in November:
11h and 2min - Average daylight in December:
11h and 0min
The month with the longest days is June (Average daylight: 13h and 12min).
The month with the shortest days is December (Average daylight: 11h and 0min).
- Average sunshine in January:
8h and 5min - Average sunshine in February:
9h and 0min - Average sunshine in March:
8h and 4min - Average sunshine in April:
8h and 4min - Average sunshine in May:
7h and 0min - Average sunshine in June:
5h and 5min
- Average sunshine in July:
5h and 3min - Average sunshine in August:
5h and 1min - Average sunshine in September:
5h and 1min - Average sunshine in October:
6h and 2min - Average sunshine in November:
7h and 5min - Average sunshine in December:
8h and 3min
The month with the most sunshine is February (Average sunshine: 9h and 0min).
The months with the least sunshine are August and September (Average sunshine: 5h and 12min).
Average UV index
Chiang Mai, Thailand
The months with the highest UV index are March, April, May, June, July, August and September (UV index 12).
The month with the lowest UV index is December (UV index 8).
