nomadseason

Monthly climate in Okegawa, Japan

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Okegawa features a humid subtropical climate (Cfa). Temperatures typically range between 5 °C (40 °F) and 28 °C (83 °F) through the year, but rarely can drop to -6 °C (22 °F) or can rise to as high as 39 °C (103 °F). The average annual precipitation amounts to about 1467 mm (57.8 inches) and receives 134 rainy days on the 1 mm (0.04 inches) threshold annually. Okegawa enjoys an average of 2941 hours of sunshine throughout the year, and daylight varies from 9 hours 44 minutes to 14 hours 33 minutes per day.

Monthly average temperatures in Okegawa, Japan

The warmest months in Okegawa are July, August and September, with daily mean temperatures ranging from 24 to 28 °C (75 - 83 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 5 to 7 °C (40 - 45 °F) throughout the day. On average each year, Okegawa experiences 105 days above 25 °C (77.0 °F) and 31 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Okegawa. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum18°C
(65°F)		21°C
(71°F)		25°C
(78°F)		29°C
(84°F)		33°C
(92°F)		34°C
(93°F)		39°C
(103°F)		37°C
(99°F)		36°C
(97°F)		31°C
(88°F)		24°C
(75°F)		21°C
(69°F)
Mean maximum16°C
(61°F)		18°C
(65°F)		23°C
(73°F)		27°C
(80°F)		31°C
(88°F)		31°C
(87°F)		35°C
(96°F)		36°C
(98°F)		34°C
(93°F)		29°C
(85°F)		23°C
(73°F)		19°C
(66°F)
Average high10°C
(50°F)		11°C
(52°F)		15°C
(59°F)		19°C
(67°F)		24°C
(76°F)		27°C
(80°F)		30°C
(86°F)		32°C
(90°F)		27°C
(81°F)		22°C
(72°F)		17°C
(63°F)		12°C
(54°F)
Daily mean5°C
(40°F)		6°C
(43°F)		10°C
(50°F)		14°C
(58°F)		20°C
(68°F)		23°C
(73°F)		26°C
(80°F)		28°C
(83°F)		24°C
(75°F)		18°C
(65°F)		13°C
(55°F)		7°C
(45°F)
Average low0°C
(33°F)		1°C
(34°F)		5°C
(41°F)		10°C
(50°F)		15°C
(59°F)		19°C
(67°F)		23°C
(74°F)		25°C
(77°F)		21°C
(70°F)		15°C
(59°F)		8°C
(47°F)		3°C
(37°F)
Mean minimum-4°C
(25°F)		-3°C
(26°F)		-1°C
(30°F)		3°C
(38°F)		8°C
(46°F)		15°C
(60°F)		19°C
(67°F)		20°C
(69°F)		16°C
(60°F)		8°C
(48°F)		2°C
(35°F)		-2°C
(29°F)
Minimum-6°C
(22°F)		-5°C
(24°F)		-3°C
(26°F)		1°C
(33°F)		6°C
(42°F)		13°C
(56°F)		17°C
(63°F)		17°C
(63°F)		13°C
(55°F)		6°C
(44°F)		-1°C
(31°F)		-3°C
(26°F)

Compare climate in Okegawa with other places

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

Monthly average precipitation in Okegawa, Japan

Okegawa usually has the most precipitation in July, September and October, with an average of 17 rainy days and 228 mm (9.0 inches) of precipitation per month. The driest months in Okegawa are January, February and December. On average, 41 mm (1.6 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Okegawa. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)41 (1.6)40 (1.6)120 (4.7)110 (4.3)110 (4.3)149 (5.9)240 (9.5)119 (4.7)185 (7.3)258 (10.2)54 (2.1)42 (1.6)
Average precipitation days (≥ 1 mm)46101012151913181575

Monthly sunshine hours in Okegawa, Japan

The sunniest months in Okegawa are April, May and August, when the sun shines an average of 9 hours 8 minutes a day. Least sunny months in Okegawa: January, July and October receive an average of 6 hours 47 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Okegawa. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours193239263277283262232280233205234233
Mean daily daylight hours9h 59m10h 51m11h 57m13h 6m14h 4m14h 33m14h 18m13h 28m12h 22m11h 14m10h 15m9h 44m

Solar UV radiation in Okegawa, Japan

Okegawa 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 5. For more detailed information, check out our hourly Okegawa UV Index data.

Average daily maximum UV levels by month for Okegawa. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)3589101011109753