Climate Overview
The climate in Chilaw is hot. The average annual temperature is 28°C and approximately 2072mm of precipitation falls per year. November is the wettest month, receiving around 371mm of rainfall. Chilaw sits near the equator, so seasonal temperature differences are minimal throughout the year.
Temperature
Chilaw has relatively stable temperatures year-round, staying within a 7°C range. The warmest month is February, 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
Chilaw is a very wet location, receiving approximately 2072mm of precipitation annually, which averages out to around 173mm per month. The wettest month is November, averaging 371mm of rainfall. October and May also tend to see above-average precipitation. The driest month is February, with just 23mm. That's 349mm less than November, 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
Chilaw is mildly breezy, with an average annual wind speed of 17km/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 22km/h, noticeable enough to affect lighter outdoor activities. The calmest conditions occur in March, with average winds dropping to 11km/h, making it an ideal period for wind-sensitive activities. Wind speeds vary significantly across the year, with a 11km/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 17km/h in winter, 13km/h in spring, 22km/h in summer, 15km/h in autumn.
Seasons
87 days until Winter
It is currently autumn in Chilaw, which began on September 23, 2026. Chilaw sits near the equator, so the traditional four-season cycle is less pronounced. Temperatures remain relatively stable year-round. The warmest period peaks in February at around 31°C, while the coldest stretch bottoms out in January near 24°C. Winter is next, beginning on December 21, 2026 (87 days from now).
Spring
Temperatures range from 26 to 31°C. Rainfall is heavy, totalling around 536mm across the season with a monthly average of 179mm. Winds are generally light, averaging 13km/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 453mm across the season with a monthly average of 151mm. Winds are moderate at around 22km/h. Light, breathable clothing is ideal. Perfect conditions for outdoor activities.
Autumn
Temperatures range from 25 to 29°C. Rainfall is heavy, totalling around 896mm across the season with a monthly average of 299mm. Winds are moderate at around 15km/h. A waterproof jacket and sturdy footwear are recommended as rain becomes more frequent.
Winter
Temperatures range from 24 to 31°C. Precipitation is moderate at around 188mm for the season, averaging 63mm per month. Winds are moderate at around 17km/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 Chilaw 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.
