May Weather in Chilaw, Sri Lanka

Last updated: August 31, 2025

In May, the average temperature in Chilaw, Sri Lanka hovers around 28°C (83°F). Expect delightful warmth, with minimums dipping to 25°C (78°F) and maximums soaring to 32°C (89°F). However, be prepared for some rain, as the area receives an average precipitation of 266 mm (10.5 in) over 29 days. With an average humidity of 76%, it's a humid but vibrant time to experience this beautiful locale!

May Temperature in Chilaw

In May in Chilaw, the average temperature is 28°C (83°F). Maximums can reach 32°C (89°F), while minimums can drop to as low as 25°C (78°F). This pleasant climate makes it an ideal time for travelers to explore and enjoy outdoor activities.

May Weather in Chilaw: Daily Temperature Highs, Lows, and Averages

The chart illustrates May temperature patterns in Chilaw, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Chilaw, May typically has an average temperature of 28°C (83°F), with highs reaching up to 32°C (89°F) and lows dropping to around 25°C (78°F).

Data source: Temperature data for Chilaw generated using information from the Copernicus Climate Change Service.

May Precipitation in Chilaw

In Chilaw in May, the precipitation amount is 266 mm (10.5 in) over the course of 29 days.

May Precipitation Trends in Chilaw

The chart displays monthly precipitation patterns in Chilaw, with values for each month alongside May’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how May’s conditions compare to those of other months. In Chilaw, May typically receives around 266 mm (10.5 inches) of precipitation spread over approximately 29 days.

Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

May Humidity in Chilaw

In Chilaw in May, humidity is 76%. With an average temperature of 28°C (83°F), this humidity feels like a warm, sticky embrace, making outdoor activities challenging and requiring travelers to stay hydrated and take frequent breaks in the shade.

May Average Humidity in Chilaw

This chart illustrates the average monthly humidity levels in Chilaw, with May’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In May, average humidity in Chilaw is approximately 76%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Chilaw

In Chilaw in May, the maximum UV index is 14, which corresponds to an extreme Exposure Category. The time to burn is just 10 minutes, so it's crucial to take precautions. For the detailed hourly UV index in Chilaw, you can check here.

Maximum UV Index Levels in Chilaw for May

The chart shows the monthly maximum UV Index (UVI) for Chilaw in May, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In May, the maximum UV index in Chilaw typically reaches 14, which falls under the extreme exposure category.

Data source: Chilaw May UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

Extreme (11+): Avoid the sun, stay in shade.
Very High (8-10): Limit sun exposure.
High (6-7): Use SPF 30+ and protective clothing.
Moderate (3-5): Midday shade recommended.
Low (0-2): No protection needed.

How May Weather in Chilaw Compares to Other Months

Weather in Chilaw varies notably across the year, with each month offering distinct climate conditions. This page compares May’s weather to other months in Chilaw, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Chilaw, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	27°C (80°F)	45 mm (1.8 inches)	77%	extreme
February Weather	27°C (82°F)	18 mm (0.7 inches)	73%	extreme
March Weather	28°C (83°F)	83 mm (3.3 inches)	74%	extreme
April Weather	28°C (83°F)	122 mm (4.8 inches)	74%	extreme
May Weather	28°C (83°F)	266 mm (10.5 inches)	76%	extreme
June Weather	28°C (83°F)	204 mm (8.0 inches)	82%	extreme
July Weather	28°C (82°F)	123 mm (4.8 inches)	82%	extreme
August Weather	27°C (81°F)	155 mm (6.1 inches)	83%	extreme
September Weather	27°C (81°F)	199 mm (7.8 inches)	82%	extreme
October Weather	27°C (81°F)	311 mm (12.2 inches)	81%	extreme
November Weather	27°C (81°F)	308 mm (12.1 inches)	80%	extreme
December Weather	27°C (81°F)	139 mm (5.5 inches)	80%	very high