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Monthly climate in Wairau Valley, New Zealand

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Wairau Valley features a oceanic climate (Cfb). Temperatures typically range between 5 °C (41 °F) and 16 °C (61 °F) through the year, but rarely can drop to -6 °C (22 °F) or can rise to as high as 29 °C (84 °F). The average annual precipitation amounts to about 1522 mm (59.9 inches) and receives 140 rainy days on the 1 mm (0.04 inches) threshold annually. Wairau Valley enjoys an average of 3151 hours of sunshine throughout the year, and daylight varies from 9 hours 11 minutes to 15 hours 6 minutes per day.

Monthly average temperatures in Wairau Valley, New Zealand

The warmest months in Wairau Valley are January, February and December, with daily mean temperatures ranging from 14 to 16 °C (58 - 61 °F) throughout the day. The coldest temperatures usually occur in June, July and August, when daily mean temperatures range from 5 to 6 °C (41 - 43 °F) throughout the day. On average each year, Wairau Valley experiences 6 days above 25 °C (77.0 °F) and 40 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Wairau Valley. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum29°C
(84°F)		27°C
(80°F)		24°C
(76°F)		22°C
(71°F)		18°C
(65°F)		16°C
(61°F)		13°C
(56°F)		16°C
(60°F)		18°C
(65°F)		20°C
(69°F)		26°C
(80°F)		27°C
(80°F)
Mean maximum27°C
(81°F)		25°C
(77°F)		22°C
(72°F)		20°C
(69°F)		17°C
(63°F)		14°C
(57°F)		12°C
(54°F)		15°C
(58°F)		17°C
(62°F)		20°C
(67°F)		22°C
(72°F)		25°C
(76°F)
Average high21°C
(71°F)		21°C
(69°F)		19°C
(66°F)		15°C
(60°F)		13°C
(55°F)		10°C
(50°F)		9°C
(49°F)		10°C
(51°F)		12°C
(54°F)		14°C
(58°F)		17°C
(63°F)		19°C
(67°F)
Daily mean16°C
(61°F)		15°C
(60°F)		13°C
(57°F)		10°C
(51°F)		8°C
(46°F)		5°C
(42°F)		5°C
(41°F)		6°C
(43°F)		7°C
(45°F)		10°C
(50°F)		12°C
(54°F)		14°C
(58°F)
Average low11°C
(52°F)		10°C
(51°F)		9°C
(48°F)		6°C
(43°F)		4°C
(39°F)		1°C
(35°F)		0°C
(33°F)		2°C
(36°F)		3°C
(37°F)		5°C
(42°F)		7°C
(46°F)		10°C
(50°F)
Mean minimum6°C
(42°F)		5°C
(41°F)		3°C
(37°F)		-1°C
(30°F)		-3°C
(27°F)		-2°C
(29°F)		-4°C
(25°F)		-4°C
(26°F)		-3°C
(27°F)		-2°C
(29°F)		1°C
(35°F)		4°C
(39°F)
Minimum3°C
(38°F)		2°C
(36°F)		1°C
(33°F)		-4°C
(25°F)		-5°C
(24°F)		-6°C
(22°F)		-5°C
(24°F)		-5°C
(24°F)		-4°C
(25°F)		-4°C
(25°F)		0°C
(33°F)		1°C
(34°F)

Compare climate in Wairau Valley with other places

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

Monthly average precipitation in Wairau Valley, New Zealand

Wairau Valley usually has the most precipitation in May, July and December, with an average of 12 rainy days and 166 mm (6.5 inches) of precipitation per month. The driest months in Wairau Valley are January, February and June. On average, 84 mm (3.3 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Wairau Valley. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)82 (3.2)95 (3.7)112 (4.4)138 (5.4)139 (5.5)75 (3.0)176 (6.9)127 (5.0)136 (5.3)127 (5.0)132 (5.2)183 (7.2)
Average precipitation days (≥ 1 mm)9711121010111312131616

Monthly sunshine hours in Wairau Valley, New Zealand

The sunniest months in Wairau Valley are February, November and December, when the sun shines an average of 10 hours 44 minutes a day. Least sunny months in Wairau Valley: May, June and July receive an average of 6 hours 23 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Wairau Valley. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours296303284238217177192227259291316346
Mean daily daylight hours14h 47m13h 41m12h 19m10h 56m9h 46m9h 11m9h 29m10h 29m11h 48m13h 12m14h 27m15h 6m

Solar UV radiation in Wairau Valley, New Zealand

Wairau Valley 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 Wairau Valley UV Index data.

Average daily maximum UV levels by month for Wairau Valley. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)1313974224691113