December Weather in Chilaw, Sri Lanka

Last updated: August 31, 2025

In December, the average temperature in Chilaw, Sri Lanka is a warm 27°C (81°F). Expect minimums of 23°C (73°F) and maximums reaching 31°C (89°F). With an average humidity of 80%, this month also sees 139 mm (5.5 in) of precipitation spread over 15 days, so be prepared for some rain amidst the warmth!

December Temperature in Chilaw

In December, in Chilaw, the average temperature is 27°C (81°F). The maximum can reach 31°C (89°F), while the minimum can drop to as low as 23°C (73°F). This warm climate makes Chilaw a perfect destination for travelers seeking pleasant weather.

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

The chart illustrates December 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, December typically has an average temperature of 27°C (81°F), with highs reaching up to 31°C (89°F) and lows dropping to around 23°C (73°F).

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

December Precipitation in Chilaw

In Chilaw in December, the precipitation amount is 139 mm (5.5 in), occurring over 15 days.

December Precipitation Trends in Chilaw

The chart displays monthly precipitation patterns in Chilaw, with values for each month alongside December’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how December’s conditions compare to those of other months. In Chilaw, December typically receives around 139 mm (5.5 inches) of precipitation spread over approximately 15 days.

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

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Millimeters (mm) Inches (in)

December Humidity in Chilaw

In Chilaw in December humidity is 80%. With an average temperature of 27°C (81°F), this humidity feels like a warm, enveloping blanket that clings to your skin, making travel tiring as sweat beads form quickly and the air feels thick and heavy.

December Average Humidity in Chilaw

This chart illustrates the average monthly humidity levels in Chilaw, with December’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In December, average humidity in Chilaw is approximately 80%, offering insight into how humid the weather typically is during this month.

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

December UV Index in Chilaw

In Chilaw in December, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in Chilaw.

Maximum UV Index Levels in Chilaw for December

The chart shows the monthly maximum UV Index (UVI) for Chilaw in December, 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 December, the maximum UV index in Chilaw typically reaches 10, which falls under the very high exposure category.

Data source: Chilaw December 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 December 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 December’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 December’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