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Monthly climate in Mersak, Indonesia

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Mersak features a tropical rainforest climate (Af). Temperatures typically range between 18 °C (65 °F) and 19 °C (67 °F) through the year, but rarely can drop to 12 °C (54 °F) or can rise to as high as 27 °C (82 °F). The average annual precipitation amounts to about 5080 mm (200.0 inches) and receives 316 rainy days on the 1 mm (0.04 inches) threshold annually. Mersak enjoys an average of 3224 hours of sunshine throughout the year, and daylight varies from 11 hours 54 minutes to 12 hours 18 minutes per day.

Monthly average temperatures in Mersak, Indonesia

The warmest months in Mersak are April, May and June, with daily mean temperatures ranging from 19 to 19 °C (66 - 67 °F) throughout the day. The coldest temperatures usually occur in September, October and November, when daily mean temperatures range from 18 to 18 °C (65 - 65 °F) throughout the day. On average each year, Mersak experiences 54 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 Mersak. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum26°C
(80°F)		27°C
(81°F)		27°C
(80°F)		27°C
(81°F)		27°C
(82°F)		27°C
(81°F)		27°C
(80°F)		27°C
(80°F)		27°C
(80°F)		27°C
(80°F)		26°C
(78°F)		26°C
(79°F)
Mean maximum26°C
(78°F)		26°C
(79°F)		26°C
(80°F)		26°C
(80°F)		27°C
(80°F)		26°C
(79°F)		26°C
(79°F)		26°C
(79°F)		26°C
(79°F)		26°C
(79°F)		25°C
(77°F)		25°C
(78°F)
Average high23°C
(74°F)		24°C
(76°F)		24°C
(76°F)		24°C
(75°F)		24°C
(76°F)		24°C
(75°F)		24°C
(75°F)		23°C
(75°F)		23°C
(74°F)		23°C
(74°F)		23°C
(73°F)		23°C
(74°F)
Daily mean18°C
(66°F)		19°C
(66°F)		19°C
(66°F)		19°C
(66°F)		19°C
(67°F)		19°C
(66°F)		19°C
(66°F)		19°C
(66°F)		18°C
(65°F)		18°C
(65°F)		18°C
(65°F)		19°C
(66°F)
Average low15°C
(59°F)		15°C
(59°F)		15°C
(59°F)		16°C
(60°F)		16°C
(61°F)		15°C
(60°F)		15°C
(59°F)		15°C
(59°F)		15°C
(59°F)		15°C
(60°F)		16°C
(60°F)		16°C
(60°F)
Mean minimum13°C
(56°F)		13°C
(56°F)		14°C
(57°F)		14°C
(58°F)		15°C
(59°F)		14°C
(58°F)		13°C
(56°F)		14°C
(57°F)		14°C
(57°F)		13°C
(56°F)		14°C
(57°F)		14°C
(58°F)
Minimum13°C
(55°F)		12°C
(54°F)		12°C
(55°F)		13°C
(56°F)		14°C
(58°F)		14°C
(57°F)		12°C
(54°F)		13°C
(55°F)		13°C
(55°F)		12°C
(55°F)		14°C
(57°F)		14°C
(57°F)

Compare climate in Mersak with other places

Compare temperature, precipitation, sunshine, UV index in Mersak, Indonesia with other places around the world.

Monthly average precipitation in Mersak, Indonesia

Mersak usually has the most precipitation in April, November and December, with an average of 29 rainy days and 562 mm (22.1 inches) of precipitation per month. The driest months in Mersak are February, June and July. On average, 295 mm (11.6 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Mersak. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)318 (12.5)292 (11.5)445 (17.5)557 (21.9)502 (19.8)297 (11.7)296 (11.7)327 (12.9)456 (18.0)463 (18.2)569 (22.4)559 (22.0)
Average precipitation days (≥ 1 mm)242630292921222427262929

Monthly sunshine hours in Mersak, Indonesia

The sunniest months in Mersak are March, July and August, when the sun shines an average of 9 hours 38 minutes a day. Least sunny months in Mersak: January, October and November receive an average of 7 hours 38 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Mersak. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours230282300269258286302293265254218261
Mean daily daylight hours11h 55m11h 59m12h 4m12h 10m12h 15m12h 18m12h 17m12h 12m12h 6m12h 1m11h 56m11h 54m

Solar UV radiation in Mersak, Indonesia

Mersak experiences the highest level of ultraviolet (UV) radiation in March, April and May, when the maximum UV index can reach values of 16 - 17, which corresponds to the Extreme category of sun exposure. June, July and December are in the Extreme exposure category. In these months, the maximum values of the UV index do not exceed 14. For more detailed information, check out our hourly Mersak UV Index data.

Average daily maximum UV levels by month for Mersak. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)151617171614131515161413