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Monthly climate in Isak, Indonesia

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Isak features a tropical rainforest climate (Af). Temperatures typically range between 20 °C (67 °F) and 21 °C (69 °F) through the year, but rarely can drop to 11 °C (52 °F) or can rise to as high as 29 °C (85 °F). The average annual precipitation amounts to about 2605 mm (102.6 inches) and receives 268 rainy days on the 1 mm (0.04 inches) threshold annually. Isak enjoys an average of 3123 hours of sunshine throughout the year, and daylight varies from 11 hours 51 minutes to 12 hours 21 minutes per day.

Monthly average temperatures in Isak, Indonesia

The warmest months in Isak are April, May and June, with daily mean temperatures ranging from 20 to 21 °C (69 - 69 °F) throughout the day. The coldest temperatures usually occur in October, November and December, when daily mean temperatures range from 20 to 20 °C (67 - 68 °F) throughout the day. On average each year, Isak experiences 212 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 Isak. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum28°C
(82°F)		28°C
(83°F)		28°C
(83°F)		29°C
(84°F)		29°C
(85°F)		29°C
(85°F)		29°C
(84°F)		29°C
(85°F)		29°C
(84°F)		29°C
(84°F)		27°C
(81°F)		27°C
(80°F)
Mean maximum27°C
(80°F)		27°C
(82°F)		28°C
(82°F)		28°C
(83°F)		29°C
(84°F)		28°C
(82°F)		29°C
(84°F)		29°C
(84°F)		28°C
(83°F)		28°C
(82°F)		26°C
(80°F)		27°C
(80°F)
Average high25°C
(77°F)		25°C
(78°F)		26°C
(79°F)		26°C
(79°F)		26°C
(79°F)		26°C
(80°F)		26°C
(80°F)		26°C
(79°F)		26°C
(78°F)		25°C
(77°F)		24°C
(76°F)		24°C
(76°F)
Daily mean20°C
(68°F)		20°C
(68°F)		20°C
(69°F)		20°C
(69°F)		21°C
(69°F)		20°C
(69°F)		20°C
(69°F)		20°C
(68°F)		20°C
(68°F)		20°C
(68°F)		20°C
(67°F)		20°C
(68°F)
Average low16°C
(61°F)		16°C
(61°F)		16°C
(61°F)		16°C
(62°F)		17°C
(63°F)		16°C
(62°F)		16°C
(61°F)		16°C
(61°F)		16°C
(61°F)		16°C
(61°F)		17°C
(62°F)		17°C
(62°F)
Mean minimum14°C
(57°F)		13°C
(56°F)		14°C
(58°F)		15°C
(59°F)		16°C
(60°F)		15°C
(59°F)		14°C
(58°F)		14°C
(58°F)		15°C
(58°F)		14°C
(58°F)		15°C
(59°F)		15°C
(59°F)
Minimum12°C
(54°F)		11°C
(52°F)		13°C
(56°F)		15°C
(58°F)		15°C
(59°F)		14°C
(57°F)		13°C
(56°F)		13°C
(55°F)		14°C
(58°F)		13°C
(56°F)		15°C
(59°F)		14°C
(58°F)

Compare climate in Isak with other places

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

Monthly average precipitation in Isak, Indonesia

Isak usually has the most precipitation in May, November and December, with an average of 28 rainy days and 335 mm (13.2 inches) of precipitation per month. The driest months in Isak are February, March and June. On average, 130 mm (5.1 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Isak. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)163 (6.4)106 (4.2)157 (6.2)220 (8.7)294 (11.6)127 (5.0)158 (6.2)171 (6.7)224 (8.8)275 (10.8)362 (14.3)348 (13.7)
Average precipitation days (≥ 1 mm)181822262818171823242927

Monthly sunshine hours in Isak, Indonesia

The sunniest months in Isak are March, July and August, when the sun shines an average of 9 hours 27 minutes a day. Least sunny months in Isak: January, October and November receive an average of 7 hours 15 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Isak. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours218276292259248283297288259241207250
Mean daily daylight hours11h 52m11h 57m12h 4m12h 12m12h 18m12h 21m12h 20m12h 14m12h 7m12h 0m11h 54m11h 51m

Solar UV radiation in Isak, Indonesia

Isak 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 Isak UV Index data.

Average daily maximum UV levels by month for Isak. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)151617171614131515151413