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Monthly climate in Whanganui, New Zealand

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Whanganui features a oceanic climate (Cfb). Temperatures typically range between 11 °C (52 °F) and 18 °C (65 °F) through the year, but rarely can drop to 5 °C (40 °F) or can rise to as high as 26 °C (79 °F). The average annual precipitation amounts to about 1249 mm (49.2 inches) and receives 154 rainy days on the 1 mm (0.04 inches) threshold annually. Whanganui enjoys an average of 3026 hours of sunshine throughout the year, and daylight varies from 9 hours 21 minutes to 14 hours 56 minutes per day.

Monthly average temperatures in Whanganui, New Zealand

The warmest months in Whanganui are January, February and March, with daily mean temperatures ranging from 17 to 18 °C (63 - 65 °F) throughout the day. The coldest temperatures usually occur in July, August and September, when daily mean temperatures range from 11 to 11 °C (52 - 53 °F) throughout the day. On average each year, Whanganui experiences 0 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 Whanganui. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum24°C
(75°F)		26°C
(79°F)		23°C
(74°F)		22°C
(71°F)		19°C
(66°F)		17°C
(63°F)		16°C
(61°F)		16°C
(61°F)		17°C
(62°F)		19°C
(66°F)		20°C
(69°F)		23°C
(74°F)
Mean maximum22°C
(72°F)		23°C
(74°F)		22°C
(72°F)		20°C
(69°F)		18°C
(65°F)		16°C
(60°F)		15°C
(59°F)		15°C
(59°F)		16°C
(62°F)		17°C
(63°F)		20°C
(68°F)		21°C
(71°F)
Average high19°C
(67°F)		20°C
(68°F)		19°C
(66°F)		17°C
(63°F)		15°C
(60°F)		13°C
(56°F)		13°C
(55°F)		13°C
(55°F)		13°C
(56°F)		15°C
(58°F)		16°C
(62°F)		19°C
(66°F)
Daily mean18°C
(64°F)		18°C
(65°F)		17°C
(63°F)		15°C
(60°F)		14°C
(57°F)		12°C
(53°F)		11°C
(52°F)		11°C
(52°F)		11°C
(53°F)		13°C
(56°F)		15°C
(59°F)		17°C
(63°F)
Average low16°C
(61°F)		16°C
(61°F)		15°C
(60°F)		13°C
(56°F)		12°C
(53°F)		10°C
(50°F)		9°C
(49°F)		9°C
(49°F)		10°C
(50°F)		11°C
(53°F)		13°C
(56°F)		15°C
(60°F)
Mean minimum13°C
(55°F)		12°C
(54°F)		11°C
(53°F)		9°C
(49°F)		8°C
(46°F)		8°C
(47°F)		6°C
(43°F)		5°C
(42°F)		7°C
(44°F)		7°C
(46°F)		10°C
(50°F)		12°C
(54°F)
Minimum11°C
(52°F)		11°C
(53°F)		11°C
(52°F)		8°C
(47°F)		7°C
(45°F)		5°C
(41°F)		5°C
(41°F)		5°C
(40°F)		6°C
(42°F)		7°C
(44°F)		9°C
(49°F)		9°C
(49°F)

Compare climate in Whanganui with other places

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

Monthly average precipitation in Whanganui, New Zealand

Whanganui usually has the most precipitation in April, August and December, with an average of 14 rainy days and 132 mm (5.2 inches) of precipitation per month. The driest months in Whanganui are January, February and November. On average, 75 mm (3.0 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Whanganui. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)61 (2.4)79 (3.1)96 (3.8)143 (5.6)88 (3.5)111 (4.4)118 (4.6)120 (4.7)114 (4.5)99 (3.9)85 (3.4)133 (5.2)
Average precipitation days (≥ 1 mm)10810131115161614141314

Monthly sunshine hours in Whanganui, New Zealand

The sunniest months in Whanganui are February, November and December, when the sun shines an average of 10 hours 14 minutes a day. Least sunny months in Whanganui: May, June and July receive an average of 6 hours 16 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Whanganui. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours276287267229207176193231248274302330
Mean daily daylight hours14h 37m13h 36m12h 18m11h 0m9h 54m9h 21m9h 38m10h 35m11h 49m13h 8m14h 18m14h 56m

Solar UV radiation in Whanganui, New Zealand

Whanganui experiences the highest level of ultraviolet (UV) radiation in January, February and December, when the maximum UV index can reach values of 13 - 13, which corresponds to the Extreme category of sun exposure. May, June and July are in the Low / Moderate exposure category. In these months, the maximum values of the UV index do not exceed 4. For more detailed information, check out our hourly Whanganui UV Index data.

Average daily maximum UV levels by month for Whanganui. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)1313974234691113