Climate Overview
The climate in Moratuwa is hot. The average annual temperature is 27°C and approximately 2470mm of precipitation falls per year. Moratuwa receives a notable amount of rainfall throughout the year, including during its driest month. Moratuwa sits near the equator, so seasonal temperature differences are minimal throughout the year.
Temperature
Moratuwa has relatively stable temperatures year-round, staying within a 7°C range. The warmest month is April, when average highs reach 31°C and the mean temperature sits around 28°C. January is the coolest month, with minimum temperatures around 24°C and an average of 27°C. Daily temperature variation is modest, with an average difference of 4°C between highs and lows.
Precipitation
Moratuwa is a very wet location, receiving approximately 2470mm of precipitation annually, which averages out to around 206mm per month. The wettest month is May, averaging 396mm of rainfall. November and June also tend to see above-average precipitation. The driest month is January, with just 46mm. That's 350mm less than May, 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
Moratuwa is relatively calm, with an average annual wind speed of 3km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is June, averaging 5km/h, though still comfortable for most outdoor activities. The calmest conditions occur in March, with average winds dropping to 2km/h, making it an ideal period for wind-sensitive activities. Wind speeds vary significantly across the year, with a 3km/h difference between the calmest and windiest months. This level of variation is worth factoring into travel plans. Wind tends to pick up during the summer months. The seasonal averages are 3km/h in winter, 3km/h in spring, 5km/h in summer, 3km/h in autumn.
Seasons
93 days until Autumn
It is currently summer in Moratuwa, which began on June 21, 2026. Moratuwa sits near the equator, so the traditional four-season cycle is less pronounced — temperatures remain relatively stable year-round. The warmest period peaks in April at around 31°C, while the coldest stretch bottoms out in January near 24°C. Autumn is next, beginning on September 23, 2026 — 93 days from now.
Spring
Temperatures range from 26 to 31°C. Rainfall is heavy, totalling around 619mm across the season with a monthly average of 206mm. Winds are generally light, averaging 3km/h. An umbrella or waterproof jacket is advisable as spring showers are frequent.
Summer
Temperatures range from 26 to 29°C. Rainfall is heavy, totalling around 724mm across the season with a monthly average of 241mm. Winds are generally light, averaging 5km/h. Light, breathable clothing is ideal — perfect conditions for outdoor activities.
Autumn
Temperatures range from 25 to 29°C. Rainfall is heavy, totalling around 864mm across the season with a monthly average of 288mm. Winds are generally light, averaging 3km/h. A waterproof jacket and sturdy footwear are recommended as rain becomes more frequent.
Winter
Temperatures range from 24 to 30°C. Precipitation is moderate at around 263mm for the season, averaging 88mm per month. Winds are generally light, averaging 3km/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 Moratuwa 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.
