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Monthly climate in Hamilton, New Zealand

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Hamilton features a oceanic climate (Cfb). Temperatures typically range between 10 °C (50 °F) and 20 °C (68 °F) through the year, but rarely can drop to -4 °C (25 °F) or can rise to as high as 29 °C (85 °F). The average annual precipitation amounts to about 1265 mm (49.8 inches) and receives 142 rainy days on the 1 mm (0.04 inches) threshold annually. Hamilton enjoys an average of 2954 hours of sunshine throughout the year, and daylight varies from 9 hours 35 minutes to 14 hours 42 minutes per day.

Monthly average temperatures in Hamilton, New Zealand

The warmest months in Hamilton are January, February and December, with daily mean temperatures ranging from 19 to 20 °C (66 - 68 °F) throughout the day. The coldest temperatures usually occur in June, July and August, when daily mean temperatures range from 10 to 11 °C (50 - 52 °F) throughout the day. On average each year, Hamilton experiences 29 days above 25 °C (77.0 °F) and 5 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Hamilton. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum29°C
(85°F)		29°C
(85°F)		29°C
(84°F)		24°C
(75°F)		22°C
(71°F)		20°C
(68°F)		18°C
(65°F)		18°C
(64°F)		20°C
(68°F)		22°C
(72°F)		27°C
(80°F)		27°C
(81°F)
Mean maximum27°C
(81°F)		28°C
(82°F)		26°C
(79°F)		23°C
(74°F)		21°C
(69°F)		18°C
(65°F)		17°C
(63°F)		17°C
(63°F)		19°C
(67°F)		21°C
(70°F)		24°C
(75°F)		26°C
(79°F)
Average high24°C
(75°F)		25°C
(77°F)		23°C
(74°F)		20°C
(68°F)		17°C
(64°F)		15°C
(59°F)		14°C
(58°F)		15°C
(59°F)		16°C
(61°F)		17°C
(64°F)		20°C
(69°F)		23°C
(73°F)
Daily mean20°C
(68°F)		20°C
(68°F)		18°C
(65°F)		15°C
(60°F)		13°C
(55°F)		11°C
(52°F)		10°C
(50°F)		11°C
(52°F)		12°C
(54°F)		14°C
(57°F)		16°C
(62°F)		19°C
(66°F)
Average low15°C
(60°F)		15°C
(60°F)		14°C
(57°F)		11°C
(52°F)		8°C
(47°F)		7°C
(45°F)		6°C
(43°F)		7°C
(45°F)		8°C
(47°F)		10°C
(50°F)		12°C
(54°F)		14°C
(58°F)
Mean minimum11°C
(51°F)		9°C
(49°F)		8°C
(47°F)		5°C
(41°F)		-0°C
(32°F)		2°C
(36°F)		-2°C
(29°F)		-1°C
(31°F)		3°C
(37°F)		3°C
(38°F)		6°C
(44°F)		8°C
(48°F)
Minimum8°C
(47°F)		7°C
(45°F)		7°C
(45°F)		4°C
(39°F)		-2°C
(29°F)		-2°C
(29°F)		-3°C
(27°F)		-4°C
(25°F)		-0°C
(32°F)		3°C
(37°F)		6°C
(43°F)		5°C
(42°F)

Compare climate in Hamilton with other places

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

Monthly average precipitation in Hamilton, New Zealand

Hamilton usually has the most precipitation in July, August and September, with an average of 14 rainy days and 133 mm (5.2 inches) of precipitation per month. The driest months in Hamilton are January, February and November. On average, 75 mm (2.9 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Hamilton. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)56 (2.2)81 (3.2)94 (3.7)117 (4.6)107 (4.2)104 (4.1)131 (5.1)149 (5.9)119 (4.7)107 (4.2)87 (3.4)112 (4.4)
Average precipitation days (≥ 1 mm)6910111112131615141213

Monthly sunshine hours in Hamilton, New Zealand

The sunniest months in Hamilton are January, November and December, when the sun shines an average of 9 hours 41 minutes a day. Least sunny months in Hamilton: May, June and July receive an average of 6 hours 15 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Hamilton. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours272266261226203175197222245263288329
Mean daily daylight hours14h 25m13h 28m12h 17m11h 5m10h 5m9h 35m9h 49m10h 41m11h 50m13h 3m14h 8m14h 42m

Solar UV radiation in Hamilton, New Zealand

Hamilton experiences the highest level of ultraviolet (UV) radiation in January, February and December, when the maximum UV index can reach values of 13 - 14, which corresponds to the Extreme category of sun exposure. May, June and July are in the 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 Hamilton UV Index data.

Average daily maximum UV levels by month for Hamilton. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)141410743357101113