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Monthly climate in Okawara, Japan

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Okawara features a humid subtropical climate (Cfa). Temperatures typically range between 1 °C (34 °F) and 25 °C (77 °F) through the year, but rarely can drop to -9 °C (17 °F) or can rise to as high as 33 °C (92 °F). The average annual precipitation amounts to about 1503 mm (59.2 inches) and receives 156 rainy days on the 1 mm (0.04 inches) threshold annually. Okawara enjoys an average of 2932 hours of sunshine throughout the year, and daylight varies from 9 hours 34 minutes to 14 hours 44 minutes per day.

Monthly average temperatures in Okawara, Japan

The warmest months in Okawara are July, August and September, with daily mean temperatures ranging from 21 to 25 °C (70 - 77 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 1 to 4 °C (34 - 39 °F) throughout the day. On average each year, Okawara experiences 48 days above 25 °C (77.0 °F) and 57 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Okawara. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum12°C
(53°F)		15°C
(60°F)		19°C
(67°F)		24°C
(76°F)		28°C
(82°F)		31°C
(87°F)		33°C
(92°F)		33°C
(92°F)		32°C
(91°F)		27°C
(80°F)		21°C
(69°F)		16°C
(62°F)
Mean maximum9°C
(49°F)		12°C
(54°F)		16°C
(62°F)		21°C
(70°F)		26°C
(79°F)		26°C
(79°F)		30°C
(87°F)		32°C
(89°F)		29°C
(85°F)		25°C
(77°F)		19°C
(67°F)		13°C
(56°F)
Average high4°C
(40°F)		6°C
(42°F)		10°C
(50°F)		14°C
(57°F)		19°C
(67°F)		22°C
(72°F)		26°C
(78°F)		27°C
(81°F)		24°C
(75°F)		19°C
(66°F)		13°C
(57°F)		7°C
(45°F)
Daily mean1°C
(34°F)		2°C
(36°F)		6°C
(43°F)		10°C
(50°F)		16°C
(61°F)		19°C
(66°F)		23°C
(74°F)		25°C
(77°F)		21°C
(70°F)		15°C
(60°F)		10°C
(49°F)		4°C
(39°F)
Average low-2°C
(29°F)		-1°C
(31°F)		2°C
(36°F)		6°C
(43°F)		12°C
(53°F)		16°C
(61°F)		21°C
(70°F)		22°C
(72°F)		18°C
(65°F)		12°C
(55°F)		6°C
(43°F)		1°C
(34°F)
Mean minimum-7°C
(20°F)		-4°C
(25°F)		-2°C
(29°F)		0°C
(33°F)		6°C
(44°F)		12°C
(53°F)		17°C
(63°F)		18°C
(65°F)		13°C
(55°F)		7°C
(44°F)		0°C
(33°F)		-3°C
(26°F)
Minimum-9°C
(17°F)		-8°C
(18°F)		-3°C
(27°F)		-0°C
(32°F)		5°C
(42°F)		10°C
(50°F)		15°C
(60°F)		16°C
(60°F)		10°C
(50°F)		5°C
(41°F)		-1°C
(30°F)		-4°C
(25°F)

Compare climate in Okawara with other places

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

Monthly average precipitation in Okawara, Japan

Okawara usually has the most precipitation in July, August and October, with an average of 17 rainy days and 229 mm (9.0 inches) of precipitation per month. The driest months in Okawara are January, February and November. On average, 47 mm (1.9 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Okawara. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)58 (2.3)46 (1.8)112 (4.4)109 (4.3)116 (4.6)105 (4.1)252 (9.9)203 (8.0)173 (6.8)233 (9.2)37 (1.5)59 (2.3)
Average precipitation days (≥ 1 mm)11101112131419201412713

Monthly sunshine hours in Okawara, Japan

The sunniest months in Okawara are May, June and August, when the sun shines an average of 9 hours 17 minutes a day. Least sunny months in Okawara: January, October and December receive an average of 6 hours 21 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Okawara. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours172223261276294281255278246210223208
Mean daily daylight hours9h 50m10h 46m11h 57m13h 10m14h 12m14h 44m14h 28m13h 34m12h 24m11h 11m10h 7m9h 34m

Solar UV radiation in Okawara, Japan

Okawara experiences the highest level of ultraviolet (UV) radiation in May, July and August, when the maximum UV index can reach values of 10 - 11, which corresponds to the Very High / 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 4. For more detailed information, check out our hourly Okawara UV Index data.

Average daily maximum UV levels by month for Okawara. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)3478101011109643