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Monthly climate in Chilaw, North Western, Sri Lanka

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Chilaw features a tropical monsoon climate (Am).Temperatures typically range between 27 °C (80 °F) and 28 °C (83 °F) through the year, but rarely can drop to 22 °C (71 °F) or can rise to as high as 34 °C (93 °F).The average annual precipitation amounts to about 1972 mm (77.6 inches) and receives 248 rainy days on the 1 mm (0.04 inches) threshold annually.Chilaw enjoys an average of 3780 hours of sunshine throughout the year, and daylight varies from 11 hours 40 minutes to 12 hours 32 minutes per day.

Monthly average temperatures in Chilaw, North Western, Sri Lanka §

The warmest months in Chilaw are March, April and May, with daily mean temperatures ranging from 28 to 28 °C (83 - 83 °F) throughout the day. The coldest temperatures usually occur in January, November and December, when daily mean temperatures range from 27 to 27 °C (80 - 81 °F) throughout the day. On average each year, Chilaw experiences 329 days above 25 °C (77.0 °F) and 0 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Chilaw, North Western, Sri Lanka.Generated using Copernicus Climate Change Service information.Data for period from January 2017 to June 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Maximum 32°C
(90°F)		 33°C
(92°F)		 34°C
(93°F)		 33°C
(92°F)		 32°C
(89°F)		 31°C
(87°F)		 30°C
(86°F)		 30°C
(85°F)		 30°C
(86°F)		 31°C
(87°F)		 32°C
(89°F)		 31°C
(89°F)
Mean maximum 32°C
(89°F)		 33°C
(91°F)		 33°C
(92°F)		 32°C
(89°F)		 31°C
(88°F)		 30°C
(86°F)		 30°C
(86°F)		 29°C
(85°F)		 30°C
(86°F)		 30°C
(86°F)		 31°C
(88°F)		 31°C
(88°F)
Average high 30°C
(86°F)		 31°C
(88°F)		 31°C
(88°F)		 30°C
(87°F)		 30°C
(86°F)		 29°C
(85°F)		 29°C
(84°F)		 28°C
(83°F)		 29°C
(84°F)		 29°C
(84°F)		 29°C
(85°F)		 30°C
(85°F)
Daily mean 27°C
(80°F)		 27°C
(82°F)		 28°C
(83°F)		 28°C
(83°F)		 28°C
(83°F)		 28°C
(83°F)		 28°C
(82°F)		 27°C
(81°F)		 27°C
(81°F)		 27°C
(81°F)		 27°C
(81°F)		 27°C
(81°F)
Average low 24°C
(76°F)		 25°C
(77°F)		 26°C
(79°F)		 27°C
(80°F)		 27°C
(81°F)		 27°C
(81°F)		 27°C
(80°F)		 26°C
(80°F)		 26°C
(79°F)		 26°C
(79°F)		 25°C
(78°F)		 25°C
(77°F)
Mean minimum 22°C
(72°F)		 23°C
(73°F)		 25°C
(76°F)		 26°C
(78°F)		 26°C
(79°F)		 26°C
(79°F)		 25°C
(78°F)		 25°C
(78°F)		 25°C
(77°F)		 25°C
(77°F)		 24°C
(76°F)		 24°C
(75°F)
Minimum 22°C
(71°F)		 22°C
(72°F)		 24°C
(75°F)		 25°C
(77°F)		 25°C
(78°F)		 26°C
(78°F)		 25°C
(78°F)		 25°C
(77°F)		 25°C
(77°F)		 24°C
(76°F)		 24°C
(75°F)		 23°C
(73°F)

Compare climate in Chilaw with other places

Compare temperature, precipitation, sunshine, UV index in Chilaw, North Western, Sri Lanka with other places around the world.

Monthly average precipitation in Chilaw, North Western, Sri Lanka §

Chilaw usually has the most precipitation in May, October and November, with an average of 27 rainy days and 295 mm (11.6 inches) of precipitation per month.The driest months in Chilaw are January, February and March. On average, 49 mm (1.9 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Chilaw, North Western, Sri Lanka.Generated using Copernicus Climate Change Service information.Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Average precipitation mm (inches) 45 (1.8) 18 (0.7) 83 (3.3) 122 (4.8) 266 (10.5) 204 (8.0) 123 (4.8) 155 (6.1) 199 (7.8) 311 (12.2) 308 (12.1) 139 (5.5)
Average precipitation days (≥ 1 mm) 5 4 16 25 29 28 23 24 26 29 24 15

Monthly sunshine hours in Chilaw, North Western, Sri Lanka §

The sunniest months in Chilaw are March, April and July, when the sun shines an average of 10 hours 59 minutes a day.Least sunny months in Chilaw: January, October and November receive an average of 9 hours 17 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Chilaw, North Western, Sri Lanka.Generated using Copernicus Atmosphere Monitoring Service information.Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Mean monthly sunshine hours 269 312 339 335 319 326 336 330 312 304 280 312
Mean daily daylight hours 11h 43m 11h 52m 12h 4m 12h 16m 12h 27m 12h 32m 12h 29m 12h 20m 12h 8m 11h 56m 11h 45m 11h 40m

Solar UV radiation in Chilaw, North Western, Sri Lanka §

Chilaw experiences the highest level of ultraviolet (UV) radiation in April, May and September, when the maximum UV index can reach values of 14 - 15, which corresponds to the Extreme category of sun exposure.January, November and December are in the Very High / Extreme exposure category. In these months, the maximum values of the UV index do not exceed 12. For more detailed information, check out our hourly Chilaw UV Index data.

Average daily maximum UV levels by month for Chilaw, North Western, Sri Lanka.Generated using Copernicus Atmosphere Monitoring Service information.Data for period from January 2022 to January 2023.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
UV Index (month maximum) 12 13 14 15 14 13 13 13 14 13 11 10