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Monthly climate in Koumac, New Caledonia

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Koumac features a tropical savanna climate (As). Temperatures typically range between 21 °C (71 °F) and 27 °C (80 °F) through the year, but rarely can drop to 16 °C (62 °F) or can rise to as high as 32 °C (90 °F). The average annual precipitation amounts to about 1033 mm (40.7 inches) and receives 124 rainy days on the 1 mm (0.04 inches) threshold annually. Koumac enjoys an average of 3421 hours of sunshine throughout the year, and daylight varies from 10 hours 53 minutes to 13 hours 20 minutes per day.

Monthly average temperatures in Koumac, New Caledonia

The warmest months in Koumac are January, February and March, with daily mean temperatures ranging from 26 to 27 °C (80 - 80 °F) throughout the day. The coldest temperatures usually occur in July, August and September, when daily mean temperatures range from 21 to 22 °C (71 - 72 °F) throughout the day. On average each year, Koumac experiences 255 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 Koumac. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum32°C
(89°F)		32°C
(90°F)		31°C
(88°F)		30°C
(87°F)		29°C
(85°F)		28°C
(83°F)		27°C
(81°F)		28°C
(82°F)		29°C
(84°F)		30°C
(86°F)		30°C
(87°F)		31°C
(88°F)
Mean maximum31°C
(88°F)		31°C
(88°F)		30°C
(87°F)		30°C
(86°F)		29°C
(84°F)		27°C
(81°F)		26°C
(79°F)		27°C
(80°F)		27°C
(81°F)		29°C
(85°F)		30°C
(86°F)		30°C
(87°F)
Average high29°C
(85°F)		29°C
(84°F)		29°C
(84°F)		28°C
(82°F)		26°C
(80°F)		25°C
(77°F)		24°C
(76°F)		24°C
(76°F)		25°C
(77°F)		27°C
(81°F)		28°C
(82°F)		29°C
(84°F)
Daily mean27°C
(80°F)		27°C
(80°F)		26°C
(80°F)		25°C
(78°F)		24°C
(75°F)		22°C
(72°F)		21°C
(71°F)		21°C
(71°F)		22°C
(72°F)		24°C
(75°F)		25°C
(77°F)		26°C
(79°F)
Average low25°C
(76°F)		25°C
(77°F)		25°C
(76°F)		23°C
(75°F)		22°C
(72°F)		20°C
(69°F)		19°C
(67°F)		19°C
(66°F)		19°C
(67°F)		21°C
(70°F)		22°C
(72°F)		24°C
(75°F)
Mean minimum23°C
(74°F)		23°C
(74°F)		23°C
(74°F)		21°C
(70°F)		19°C
(67°F)		19°C
(67°F)		17°C
(63°F)		17°C
(62°F)		17°C
(64°F)		19°C
(66°F)		20°C
(69°F)		22°C
(72°F)
Minimum22°C
(72°F)		22°C
(72°F)		22°C
(73°F)		20°C
(68°F)		18°C
(65°F)		17°C
(63°F)		16°C
(62°F)		16°C
(62°F)		16°C
(62°F)		18°C
(65°F)		20°C
(67°F)		22°C
(71°F)

Compare climate in Koumac with other places

Compare temperature, precipitation, sunshine, UV index in Koumac, New Caledonia with other places around the world.

Monthly average precipitation in Koumac, New Caledonia

Koumac usually has the most precipitation in January, February and December, with an average of 18 rainy days and 169 mm (6.6 inches) of precipitation per month. The driest months in Koumac are June, September and November. On average, 29 mm (1.1 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Koumac. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)174 (6.9)183 (7.2)121 (4.7)104 (4.1)49 (1.9)30 (1.2)54 (2.1)53 (2.1)16 (0.6)61 (2.4)40 (1.6)148 (5.8)
Average precipitation days (≥ 1 mm)162017138435261020

Monthly sunshine hours in Koumac, New Caledonia

The sunniest months in Koumac are October, November and December, when the sun shines an average of 10 hours 27 minutes a day. Least sunny months in Koumac: January, May and June receive an average of 8 hours 18 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Koumac. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours258289299272261244272273288313319328
Mean daily daylight hours13h 12m12h 45m12h 11m11h 36m11h 7m10h 53m11h 0m11h 25m11h 57m12h 33m13h 4m13h 20m

Solar UV radiation in Koumac, New Caledonia

Koumac experiences the highest level of ultraviolet (UV) radiation in January, February and December, when the maximum UV index can reach values of 15 - 16, which corresponds to the Extreme category of sun exposure. May, June and July are in the High / Very High exposure category. In these months, the maximum values of the UV index do not exceed 9. For more detailed information, check out our hourly Koumac UV Index data.

Average daily maximum UV levels by month for Koumac. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)161615129781012131515