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Monthly climate in Oarai, Japan

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Oarai features a humid subtropical climate (Cfa). Temperatures typically range between 6 °C (43 °F) and 26 °C (80 °F) through the year, but rarely can drop to -3 °C (27 °F) or can rise to as high as 33 °C (92 °F). The average annual precipitation amounts to about 1608 mm (63.3 inches) and receives 145 rainy days on the 1 mm (0.04 inches) threshold annually. Oarai enjoys an average of 2961 hours of sunshine throughout the year, and daylight varies from 9 hours 43 minutes to 14 hours 33 minutes per day.

Monthly average temperatures in Oarai, Japan

The warmest months in Oarai are July, August and September, with daily mean temperatures ranging from 23 to 26 °C (74 - 80 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 6 to 8 °C (43 - 47 °F) throughout the day. On average each year, Oarai experiences 62 days above 25 °C (77.0 °F) and 2 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Oarai. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum15°C
(60°F)		18°C
(65°F)		20°C
(69°F)		23°C
(74°F)		27°C
(82°F)		30°C
(86°F)		31°C
(89°F)		33°C
(92°F)		32°C
(90°F)		29°C
(85°F)		22°C
(72°F)		20°C
(68°F)
Mean maximum14°C
(57°F)		16°C
(60°F)		19°C
(66°F)		22°C
(71°F)		26°C
(79°F)		26°C
(80°F)		30°C
(86°F)		32°C
(90°F)		30°C
(87°F)		26°C
(79°F)		21°C
(70°F)		17°C
(62°F)
Average high9°C
(48°F)		10°C
(50°F)		13°C
(56°F)		16°C
(62°F)		21°C
(70°F)		23°C
(74°F)		26°C
(80°F)		29°C
(84°F)		25°C
(78°F)		21°C
(69°F)		16°C
(62°F)		11°C
(52°F)
Daily mean6°C
(43°F)		6°C
(44°F)		10°C
(50°F)		13°C
(56°F)		18°C
(65°F)		21°C
(70°F)		24°C
(76°F)		26°C
(80°F)		23°C
(74°F)		19°C
(66°F)		14°C
(57°F)		8°C
(47°F)
Average low3°C
(38°F)		4°C
(39°F)		7°C
(44°F)		10°C
(51°F)		15°C
(60°F)		19°C
(66°F)		23°C
(73°F)		24°C
(76°F)		21°C
(71°F)		17°C
(62°F)		11°C
(52°F)		6°C
(43°F)
Mean minimum-0°C
(32°F)		0°C
(33°F)		2°C
(36°F)		5°C
(42°F)		10°C
(51°F)		16°C
(61°F)		20°C
(67°F)		21°C
(70°F)		17°C
(63°F)		12°C
(53°F)		6°C
(43°F)		2°C
(35°F)
Minimum-3°C
(27°F)		-1°C
(30°F)		0°C
(33°F)		3°C
(37°F)		9°C
(49°F)		15°C
(58°F)		19°C
(66°F)		19°C
(67°F)		15°C
(60°F)		10°C
(51°F)		4°C
(39°F)		0°C
(33°F)

Compare climate in Oarai with other places

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

Monthly average precipitation in Oarai, Japan

Oarai usually has the most precipitation in July, September and October, with an average of 17 rainy days and 214 mm (8.4 inches) of precipitation per month. The driest months in Oarai are January, February and December. On average, 59 mm (2.3 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Oarai. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)53 (2.1)50 (2.0)150 (5.9)129 (5.1)143 (5.6)155 (6.1)209 (8.2)109 (4.3)176 (6.9)258 (10.2)102 (4.0)73 (2.9)
Average precipitation days (≥ 1 mm)681111121419131716108

Monthly sunshine hours in Oarai, Japan

The sunniest months in Oarai are April, May and August, when the sun shines an average of 9 hours 13 minutes a day. Least sunny months in Oarai: January, October and December receive an average of 6 hours 44 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Oarai. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours187235259278282270248287240213231226
Mean daily daylight hours9h 59m10h 51m11h 57m13h 6m14h 4m14h 33m14h 19m13h 28m12h 22m11h 14m10h 14m9h 43m

Solar UV radiation in Oarai, Japan

Oarai experiences the highest level of ultraviolet (UV) radiation in June, 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 Oarai UV Index data.

Average daily maximum UV levels by month for Oarai. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)3579101111109653