Climate Overview
The climate in Ratchaburi is hot. The average annual temperature is 28°C and approximately 1176mm of precipitation falls per year. October is the wettest month, receiving around 212mm of rainfall. Ratchaburi is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: April, May, March. The coldest months are January, December, February, when temperatures can drop to 22°C.
Temperature
Ratchaburi sees moderate temperature variation throughout the year, ranging from 22°C to 36°C. April is the hottest month, with daytime highs reaching 36°C and an average of 31°C. January is the coolest month, with minimum temperatures around 22°C and an average of 26°C. Daily temperature variation is modest, with an average difference of 8°C between highs and lows. The sharpest temperature change occurs between February and March, with a 2°C shift in average temperatures.
Precipitation
Ratchaburi is a moderately rainy area, receiving approximately 1176mm of precipitation annually, which averages out to around 98mm per month. The wettest month is October, averaging 212mm of rainfall. September and August also tend to see above-average precipitation. The driest month is December, with just 15mm. That's 197mm less than October, 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
Ratchaburi is relatively calm, with an average annual wind speed of 7km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is December, averaging 8km/h, though still comfortable for most outdoor activities. The calmest conditions occur in October, with average winds dropping to 6km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 2km/h gap between the calmest and windiest months.
Seasons
87 days until Winter
It is currently autumn in Ratchaburi, which began on September 23, 2026. Ratchaburi 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 22°C. Winter is next, beginning on December 21, 2026 (87 days from now).
Spring
Temperatures range from 25 to 36°C. Precipitation is moderate at around 233mm for the season, averaging 78mm per month. Winds are generally light, averaging 7km/h. An umbrella or waterproof jacket is advisable as spring showers are frequent.
Summer
Temperatures range from 26 to 34°C. Rainfall is heavy, totalling around 393mm across the season with a monthly average of 131mm. Winds are generally light, averaging 7km/h. Light, breathable clothing is ideal. Perfect conditions for outdoor activities.
Autumn
Temperatures range from 24 to 33°C. Rainfall is heavy, totalling around 498mm across the season with a monthly average of 166mm. Winds are generally light, averaging 6km/h. A waterproof jacket and sturdy footwear are recommended as rain becomes more frequent.
Winter
Temperatures range from 22 to 33°C. Rainfall is relatively light, with around 53mm over the season and a monthly average of 18mm. Winds are generally light, averaging 7km/h. A light jacket or sweater is usually sufficient, though cooler evenings may call for an extra layer.
Monthly Climate Data
The table below shows monthly climate averages for Ratchaburi 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.
