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Monthly climate in Alotau, Papua New Guinea

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Alotau features a tropical rainforest climate (Af). Temperatures typically range between 24 °C (75 °F) and 27 °C (80 °F) through the year, but rarely can drop to 18 °C (65 °F) or can rise to as high as 34 °C (94 °F). The average annual precipitation amounts to about 3512 mm (138.3 inches) and receives 296 rainy days on the 1 mm (0.04 inches) threshold annually. Alotau enjoys an average of 3248 hours of sunshine throughout the year, and daylight varies from 11 hours 31 minutes to 12 hours 42 minutes per day.

Monthly average temperatures in Alotau, Papua New Guinea

The warmest months in Alotau are January, February and December, 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 24 to 24 °C (75 - 76 °F) throughout the day. On average each year, Alotau experiences 322 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 Alotau. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum33°C
(92°F)		34°C
(94°F)		32°C
(90°F)		32°C
(90°F)		31°C
(87°F)		29°C
(84°F)		29°C
(84°F)		29°C
(84°F)		29°C
(84°F)		30°C
(87°F)		32°C
(90°F)		32°C
(91°F)
Mean maximum32°C
(91°F)		33°C
(91°F)		32°C
(89°F)		31°C
(88°F)		30°C
(86°F)		28°C
(83°F)		28°C
(83°F)		28°C
(83°F)		28°C
(83°F)		30°C
(86°F)		31°C
(88°F)		32°C
(89°F)
Average high30°C
(86°F)		30°C
(87°F)		30°C
(86°F)		29°C
(84°F)		28°C
(83°F)		27°C
(80°F)		26°C
(80°F)		26°C
(80°F)		26°C
(80°F)		28°C
(82°F)		29°C
(84°F)		30°C
(86°F)
Daily mean26°C
(80°F)		27°C
(80°F)		26°C
(79°F)		26°C
(79°F)		25°C
(78°F)		24°C
(76°F)		24°C
(76°F)		24°C
(75°F)		24°C
(76°F)		25°C
(77°F)		26°C
(78°F)		26°C
(80°F)
Average low24°C
(76°F)		24°C
(75°F)		24°C
(75°F)		24°C
(75°F)		23°C
(74°F)		23°C
(74°F)		23°C
(73°F)		22°C
(72°F)		23°C
(73°F)		23°C
(74°F)		23°C
(74°F)		24°C
(75°F)
Mean minimum23°C
(74°F)		23°C
(74°F)		23°C
(74°F)		23°C
(73°F)		22°C
(72°F)		22°C
(72°F)		21°C
(71°F)		20°C
(68°F)		21°C
(70°F)		22°C
(71°F)		22°C
(72°F)		23°C
(73°F)
Minimum22°C
(72°F)		22°C
(72°F)		23°C
(73°F)		22°C
(72°F)		21°C
(71°F)		21°C
(70°F)		21°C
(69°F)		18°C
(65°F)		19°C
(67°F)		20°C
(69°F)		22°C
(71°F)		22°C
(72°F)

Compare climate in Alotau with other places

Compare temperature, precipitation, sunshine, UV index in Alotau, Papua New Guinea with other places around the world.

Monthly average precipitation in Alotau, Papua New Guinea

Alotau usually has the most precipitation in March, April and September, with an average of 26 rainy days and 353 mm (13.9 inches) of precipitation per month. The driest months in Alotau are May, August and December. On average, 236 mm (9.3 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Alotau. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)283 (11.1)306 (12.1)368 (14.5)334 (13.1)218 (8.6)324 (12.8)272 (10.7)248 (9.8)357 (14.1)309 (12.2)250 (9.8)243 (9.6)
Average precipitation days (≥ 1 mm)222128262526252325262326

Monthly sunshine hours in Alotau, Papua New Guinea

The sunniest months in Alotau are October, November and December, when the sun shines an average of 9 hours 49 minutes a day. Least sunny months in Alotau: January, June and September receive an average of 8 hours 0 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Alotau. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours229262270265282247259275250294295313
Mean daily daylight hours12h 38m12h 25m12h 8m11h 51m11h 37m11h 31m11h 34m11h 45m12h 1m12h 19m12h 34m12h 42m

Solar UV radiation in Alotau, Papua New Guinea

Alotau experiences the highest level of ultraviolet (UV) radiation in January, February and March, when the maximum UV index can reach values of 16 - 16, which corresponds to the Extreme category of sun exposure. May, June and July 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 Alotau UV Index data.

Average daily maximum UV levels by month for Alotau. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)161616151210111315161515