Climate Overview
The climate in Chiang Rai is warm and mild. The average annual temperature is 25°C and approximately 1946mm of precipitation falls per year. August is the wettest month, receiving around 397mm of rainfall. Chiang Rai 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, February, December, when temperatures can drop to 14°C.
Temperature
Temperatures in Chiang Rai vary considerably across the year, with a 21°C difference between the coldest and warmest months. The warmest month is April, when average highs reach 35°C and the mean temperature sits around 28°C. January is the coolest month, with minimum temperatures around 14°C and an average of 20°C. On average, daily temperatures fluctuate by about 11°C between overnight lows and afternoon highs. The sharpest temperature change occurs between February and March, with a 4°C shift in average temperatures.
Precipitation
Chiang Rai is a fairly wet location, receiving approximately 1946mm of precipitation annually, which averages out to around 162mm per month. The wettest month is August, averaging 397mm of rainfall. July and September also tend to see above-average precipitation. The driest month is February, with just 16mm. That's 381mm 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
Chiang Rai is relatively calm, with an average annual wind speed of 5km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is March, averaging 5km/h, though still comfortable for most outdoor activities. The calmest conditions occur in September, with average winds dropping to 4km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 1km/h gap between the calmest and windiest months.
Seasons
87 days until Winter
It is currently autumn in Chiang Rai, which began on September 23, 2026. Chiang Rai 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 35°C, while the coldest stretch bottoms out in January near 14°C. Winter is next, beginning on December 21, 2026 (87 days from now).
Spring
Temperatures range from 18 to 35°C. Rainfall is heavy, totalling around 378mm across the season with a monthly average of 126mm. Winds are generally light, averaging 5km/h. An umbrella or waterproof jacket is advisable as spring showers are frequent.
Summer
Temperatures range from 24 to 32°C. Rainfall is heavy, totalling around 1010mm across the season with a monthly average of 337mm. Winds are generally light, averaging 5km/h. Light, breathable clothing is ideal. Perfect conditions for outdoor activities.
Autumn
Temperatures range from 19 to 31°C. Rainfall is heavy, totalling around 483mm across the season with a monthly average of 161mm. Winds are generally light, averaging 4km/h. A waterproof jacket and sturdy footwear are recommended as rain becomes more frequent.
Winter
Temperatures range from 14 to 31°C. Rainfall is relatively light, with around 75mm over the season and a monthly average of 25mm. Winds are generally light, averaging 5km/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 Chiang Rai is during January, February, November and December, when the weather is most comfortable for travellers. During these months, average temperatures hover around 21°C with modest rainfall averaging 32mm per month. By contrast, April can be uncomfortably hot with temperatures reaching 35°C. A light rain jacket is recommended, though showers are generally brief and shouldn't disrupt your plans.
Monthly Climate Data
The table below shows monthly climate averages for Chiang Rai 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.
