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Monthly climate in Hamamatsu, Japan

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Hamamatsu features a humid subtropical climate (Cfa). Temperatures typically range between 7 °C (44 °F) and 29 °C (84 °F) through the year, but rarely can drop to -2 °C (29 °F) or can rise to as high as 42 °C (107 °F). The average annual precipitation amounts to about 2193 mm (86.4 inches) and receives 144 rainy days on the 1 mm (0.04 inches) threshold annually. Hamamatsu enjoys an average of 3085 hours of sunshine throughout the year, and daylight varies from 9 hours 51 minutes to 14 hours 26 minutes per day.

Monthly average temperatures in Hamamatsu, Japan

The warmest months in Hamamatsu are July, August and September, with daily mean temperatures ranging from 25 to 29 °C (77 - 84 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 7 to 9 °C (44 - 49 °F) throughout the day. On average each year, Hamamatsu experiences 115 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 Hamamatsu. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum18°C
(64°F)		21°C
(71°F)		25°C
(77°F)		28°C
(83°F)		32°C
(90°F)		32°C
(90°F)		40°C
(105°F)		42°C
(107°F)		36°C
(96°F)		32°C
(89°F)		24°C
(75°F)		23°C
(74°F)
Mean maximum16°C
(60°F)		18°C
(64°F)		22°C
(72°F)		26°C
(78°F)		30°C
(86°F)		31°C
(87°F)		35°C
(96°F)		37°C
(99°F)		34°C
(93°F)		30°C
(87°F)		23°C
(74°F)		19°C
(66°F)
Average high11°C
(51°F)		12°C
(53°F)		16°C
(61°F)		20°C
(68°F)		24°C
(76°F)		27°C
(80°F)		30°C
(86°F)		32°C
(91°F)		28°C
(83°F)		24°C
(75°F)		19°C
(66°F)		13°C
(56°F)
Daily mean7°C
(44°F)		7°C
(46°F)		12°C
(53°F)		15°C
(60°F)		20°C
(68°F)		23°C
(74°F)		27°C
(81°F)		29°C
(84°F)		25°C
(77°F)		20°C
(68°F)		15°C
(58°F)		9°C
(49°F)
Average low3°C
(38°F)		4°C
(39°F)		7°C
(45°F)		11°C
(53°F)		16°C
(61°F)		20°C
(68°F)		24°C
(76°F)		26°C
(79°F)		22°C
(72°F)		17°C
(63°F)		11°C
(52°F)		5°C
(42°F)
Mean minimum-1°C
(30°F)		-0°C
(32°F)		2°C
(36°F)		5°C
(41°F)		10°C
(50°F)		16°C
(62°F)		21°C
(70°F)		22°C
(73°F)		18°C
(65°F)		11°C
(52°F)		5°C
(41°F)		1°C
(34°F)
Minimum-2°C
(29°F)		-2°C
(29°F)		1°C
(34°F)		3°C
(37°F)		9°C
(49°F)		15°C
(59°F)		19°C
(67°F)		20°C
(68°F)		15°C
(60°F)		10°C
(50°F)		3°C
(38°F)		-0°C
(32°F)

Compare climate in Hamamatsu with other places

Compare temperature, precipitation, sunshine, UV index in Hamamatsu, Japan with other places around the world.

Monthly average precipitation in Hamamatsu, Japan

Hamamatsu usually has the most precipitation in June, July and October, with an average of 17 rainy days and 321 mm (12.6 inches) of precipitation per month. The driest months in Hamamatsu are January, February and December. On average, 64 mm (2.5 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Hamamatsu. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)51 (2.0)76 (3.0)166 (6.5)172 (6.8)198 (7.8)261 (10.3)408 (16.1)197 (7.8)222 (8.7)293 (11.5)83 (3.3)67 (2.6)
Average precipitation days (≥ 1 mm)46101112162115201586

Monthly sunshine hours in Hamamatsu, Japan

The sunniest months in Hamamatsu are April, May and August, when the sun shines an average of 9 hours 44 minutes a day. Least sunny months in Hamamatsu: January, October and December receive an average of 6 hours 56 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Hamamatsu. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours188234268281298274267316256226241230
Mean daily daylight hours10h 5m10h 54m11h 58m13h 3m13h 58m14h 26m14h 12m13h 24m12h 21m11h 16m10h 20m9h 51m

Solar UV radiation in Hamamatsu, Japan

Hamamatsu experiences the highest level of ultraviolet (UV) radiation in May, July and August, when the maximum UV index can reach values of 11 - 12, which corresponds to the Extreme category of sun exposure. January, February and December are in the Moderate exposure category. In these months, the maximum values of the UV index do not exceed 5. For more detailed information, check out our hourly Hamamatsu UV Index data.

Average daily maximum UV levels by month for Hamamatsu. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)458101111121110754