Climate Overview
The climate in Ratnapura is hot. The average annual temperature is 26°C and approximately 3860mm of precipitation falls per year. Ratnapura receives a notable amount of rainfall throughout the year, including during its driest month. Ratnapura sits near the equator, so seasonal temperature differences are minimal throughout the year.
Temperature
Ratnapura has relatively stable temperatures year-round, staying within a 10°C range. The warmest month is March, when average highs reach 31°C and the mean temperature sits around 26°C. January is the coolest month, with minimum temperatures around 21°C and an average of 25°C. Daily temperature variation is modest, with an average difference of 7°C between highs and lows.
Precipitation
Ratnapura is a very wet location, receiving approximately 3860mm of precipitation annually, which averages out to around 322mm per month. The wettest month is November, averaging 527mm of rainfall. May and October also tend to see above-average precipitation. The driest month is February, with just 173mm. That's 354mm less than November, the wettest month. Precipitation varies noticeably between seasons, with the second half (July to December) of the year generally seeing more rainfall.
Wind
Ratnapura 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 July, averaging 14km/h, though still comfortable for most outdoor activities. The calmest conditions occur in January, with average winds dropping to 8km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 6km/h gap between the calmest and windiest months. Wind tends to pick up during the summer months. The seasonal averages are 8km/h in winter, 9km/h in spring, 13km/h in summer, 11km/h in autumn.
Seasons
89 days until Summer
It is currently spring in Ratnapura, which began on March 20, 2026. Ratnapura sits near the equator, so the traditional four-season cycle is less pronounced — temperatures remain relatively stable year-round. The warmest period peaks in March at around 31°C, while the coldest stretch bottoms out in January near 21°C. Summer is next, beginning on June 21, 2026 — 89 days from now.
Spring
Temperatures range from 22 to 31°C. Rainfall is heavy, totalling around 1036mm across the season with a monthly average of 345mm. Winds are generally light, averaging 9km/h. An umbrella or waterproof jacket is advisable as spring showers are frequent.
Summer
Temperatures range from 23 to 29°C. Rainfall is heavy, totalling around 868mm across the season with a monthly average of 289mm. Winds are generally light, averaging 13km/h. Light, breathable clothing is ideal — perfect conditions for outdoor activities.
Autumn
Temperatures range from 22 to 29°C. Rainfall is heavy, totalling around 1296mm across the season with a monthly average of 432mm. Winds are generally light, averaging 11km/h. A waterproof jacket and sturdy footwear are recommended as rain becomes more frequent.
Winter
Temperatures range from 21 to 30°C. Rainfall is heavy, totalling around 660mm across the season with a monthly average of 220mm. Winds are generally light, averaging 8km/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 Ratnapura 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.
