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Monthly climate in Riwaka, New Zealand

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Riwaka features a oceanic climate (Cfb). Temperatures typically range between 9 °C (48 °F) and 18 °C (64 °F) through the year, but rarely can drop to 3 °C (37 °F) or can rise to as high as 26 °C (79 °F). The average annual precipitation amounts to about 1601 mm (63.0 inches) and receives 142 rainy days on the 1 mm (0.04 inches) threshold annually. Riwaka enjoys an average of 2985 hours of sunshine throughout the year, and daylight varies from 9 hours 14 minutes to 15 hours 3 minutes per day.

Monthly average temperatures in Riwaka, New Zealand

The warmest months in Riwaka are January, February and December, with daily mean temperatures ranging from 16 to 18 °C (62 - 64 °F) throughout the day. The coldest temperatures usually occur in June, July and August, when daily mean temperatures range from 9 to 10 °C (48 - 50 °F) throughout the day. On average each year, Riwaka experiences 1 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 Riwaka. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum26°C
(79°F)		25°C
(76°F)		23°C
(73°F)		21°C
(69°F)		18°C
(65°F)		16°C
(61°F)		14°C
(58°F)		15°C
(59°F)		16°C
(61°F)		19°C
(66°F)		23°C
(74°F)		24°C
(76°F)
Mean maximum24°C
(76°F)		23°C
(74°F)		22°C
(71°F)		20°C
(68°F)		17°C
(63°F)		14°C
(58°F)		13°C
(56°F)		14°C
(57°F)		15°C
(60°F)		18°C
(64°F)		20°C
(68°F)		23°C
(73°F)
Average high20°C
(69°F)		20°C
(68°F)		18°C
(65°F)		16°C
(62°F)		14°C
(58°F)		12°C
(54°F)		11°C
(52°F)		12°C
(53°F)		13°C
(55°F)		14°C
(58°F)		16°C
(62°F)		19°C
(66°F)
Daily mean18°C
(64°F)		17°C
(63°F)		16°C
(61°F)		14°C
(57°F)		12°C
(54°F)		10°C
(50°F)		9°C
(48°F)		9°C
(49°F)		10°C
(51°F)		12°C
(54°F)		14°C
(58°F)		16°C
(62°F)
Average low15°C
(59°F)		15°C
(59°F)		14°C
(57°F)		12°C
(53°F)		10°C
(50°F)		8°C
(46°F)		7°C
(44°F)		7°C
(46°F)		8°C
(47°F)		10°C
(50°F)		12°C
(53°F)		14°C
(57°F)
Mean minimum11°C
(53°F)		11°C
(52°F)		11°C
(51°F)		8°C
(46°F)		6°C
(43°F)		6°C
(43°F)		4°C
(39°F)		4°C
(40°F)		4°C
(40°F)		6°C
(42°F)		8°C
(46°F)		11°C
(52°F)
Minimum10°C
(51°F)		10°C
(51°F)		10°C
(50°F)		6°C
(42°F)		4°C
(40°F)		3°C
(38°F)		3°C
(37°F)		4°C
(39°F)		4°C
(39°F)		4°C
(40°F)		7°C
(44°F)		9°C
(48°F)

Compare climate in Riwaka with other places

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

Monthly average precipitation in Riwaka, New Zealand

Riwaka usually has the most precipitation in May, July and August, with an average of 13 rainy days and 170 mm (6.7 inches) of precipitation per month. The driest months in Riwaka are January, February and June. On average, 88 mm (3.5 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Riwaka. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)85 (3.4)94 (3.7)128 (5.0)154 (6.1)168 (6.6)86 (3.4)184 (7.3)156 (6.2)125 (4.9)137 (5.4)132 (5.2)151 (5.9)
Average precipitation days (≥ 1 mm)8811131211131412131314

Monthly sunshine hours in Riwaka, New Zealand

The sunniest months in Riwaka are February, November and December, when the sun shines an average of 10 hours 3 minutes a day. Least sunny months in Riwaka: May, June and July receive an average of 6 hours 10 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Riwaka. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours282289268225206178183215248271291324
Mean daily daylight hours14h 44m13h 40m12h 19m10h 57m9h 49m9h 14m9h 31m10h 31m11h 48m13h 11m14h 24m15h 3m

Solar UV radiation in Riwaka, New Zealand

Riwaka 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 Riwaka UV Index data.

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