Climate Overview
The climate in Si Chiang Mai is hot. The average annual temperature is 27°C and approximately 1754mm of precipitation falls per year. August is the wettest month, receiving around 395mm of rainfall. Si Chiang Mai is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: April, March, May. The coldest months are January, December, February, when temperatures can drop to 17°C.
Temperature
Si Chiang Mai sees moderate temperature variation throughout the year, ranging from 17°C to 36°C. April is the hottest month, with daytime highs reaching 36°C and an average of 30°C. January is the coolest month, with minimum temperatures around 17°C and an average of 23°C. On average, daily temperatures fluctuate by about 10°C between overnight lows and afternoon highs. The sharpest temperature change occurs between February and March, with a 3°C shift in average temperatures.
Precipitation
Si Chiang Mai is a fairly wet location, receiving approximately 1754mm of precipitation annually, which averages out to around 146mm per month. The wettest month is August, averaging 395mm of rainfall. July and September also tend to see above-average precipitation. The driest month is December, with just 5mm. That's 390mm less than August, the wettest month. Rainfall is heavily concentrated in certain months, creating a distinct wet and dry season. Visitors should plan around these patterns, as the difference between peak and low months is dramatic.
Wind
Si Chiang Mai is relatively calm, with an average annual wind speed of 10km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is February, averaging 11km/h, though still comfortable for most outdoor activities. The calmest conditions occur in October, with average winds dropping to 8km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 3km/h between the calmest and windiest months.
Seasons
89 days until Summer
It is currently spring in Si Chiang Mai, which began on March 20, 2026. Si Chiang Mai is in the Northern Hemisphere, where spring begins in March, summer in June, autumn in September, and winter in December. The warmest period peaks in April at around 36°C, while the coldest stretch bottoms out in January near 17°C. Summer is next, beginning on June 21, 2026 — 89 days from now.
Spring
Temperatures range from 22 to 36°C. Precipitation is moderate at around 278mm for the season, averaging 93mm per month. Winds are generally light, averaging 10km/h. An umbrella or waterproof jacket is advisable as spring showers are frequent.
Summer
Temperatures range from 26 to 33°C. Rainfall is heavy, totalling around 997mm across the season with a monthly average of 332mm. Winds are generally light, averaging 9km/h. Light, breathable clothing is ideal — perfect conditions for outdoor activities.
Autumn
Temperatures range from 22 to 32°C. Rainfall is heavy, totalling around 438mm across the season with a monthly average of 146mm. Winds are generally light, averaging 8km/h. A waterproof jacket and sturdy footwear are recommended as rain becomes more frequent.
Winter
Temperatures range from 17 to 32°C. Precipitation is minimal, with only around 41mm for the entire season. Winds are generally light, averaging 10km/h. A light jacket or sweater is usually sufficient, though cooler evenings may call for an extra layer.
Best Time to Visit
The best time to visit Si Chiang Mai is during January, February and December, when the weather is most comfortable for travellers. During these months, average temperatures hover around 24°C with modest rainfall averaging 14mm per month. By contrast, April can be uncomfortably hot with temperatures reaching 36°C. With minimal rainfall expected, you can pack light and plan outdoor activities with confidence.
Monthly Climate Data
The table below shows monthly climate averages for Si Chiang Mai based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Celsius (°C). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Wind speed is the average sustained speed in kilometres per hour (km/h). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.
