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Monthly climate in Omu, Japan

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Omu features a humid continental climate (Dfb). Temperatures typically range between -7 °C (20 °F) and 19 °C (66 °F) through the year, but rarely can drop to -20 °C (-4 °F) or can rise to as high as 30 °C (86 °F). The average annual precipitation amounts to about 1058 mm (41.7 inches) and receives 168 rainy days on the 1 mm (0.04 inches) threshold annually. Omu enjoys an average of 2861 hours of sunshine throughout the year, and daylight varies from 8 hours 52 minutes to 15 hours 29 minutes per day.

Monthly average temperatures in Omu, Japan

The warmest months in Omu are July, August and September, with daily mean temperatures ranging from 17 to 19 °C (62 - 66 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -7 to -3 °C (20 - 27 °F) throughout the day. On average each year, Omu experiences 10 days above 25 °C (77.0 °F) and 132 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Omu. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum3°C
(38°F)		7°C
(44°F)		13°C
(56°F)		20°C
(68°F)		28°C
(82°F)		26°C
(80°F)		29°C
(85°F)		30°C
(86°F)		28°C
(82°F)		22°C
(73°F)		16°C
(61°F)		12°C
(53°F)
Mean maximum2°C
(36°F)		4°C
(39°F)		9°C
(49°F)		16°C
(62°F)		23°C
(74°F)		22°C
(72°F)		28°C
(83°F)		28°C
(82°F)		25°C
(77°F)		20°C
(69°F)		14°C
(58°F)		7°C
(44°F)
Average high-4°C
(26°F)		-3°C
(26°F)		2°C
(35°F)		8°C
(46°F)		14°C
(57°F)		16°C
(61°F)		21°C
(70°F)		22°C
(71°F)		20°C
(68°F)		14°C
(57°F)		6°C
(44°F)		-1°C
(31°F)
Daily mean-7°C
(20°F)		-6°C
(21°F)		-1°C
(30°F)		4°C
(40°F)		10°C
(51°F)		13°C
(56°F)		18°C
(65°F)		19°C
(66°F)		17°C
(62°F)		11°C
(51°F)		4°C
(39°F)		-3°C
(27°F)
Average low-10°C
(15°F)		-10°C
(15°F)		-4°C
(24°F)		1°C
(34°F)		7°C
(44°F)		10°C
(51°F)		16°C
(61°F)		17°C
(62°F)		14°C
(57°F)		7°C
(46°F)		2°C
(35°F)		-5°C
(23°F)
Mean minimum-15°C
(5°F)		-17°C
(2°F)		-11°C
(12°F)		-6°C
(22°F)		1°C
(34°F)		6°C
(43°F)		11°C
(52°F)		12°C
(55°F)		9°C
(48°F)		3°C
(38°F)		-4°C
(25°F)		-11°C
(13°F)
Minimum-17°C
(1°F)		-20°C
(-4°F)		-14°C
(7°F)		-9°C
(17°F)		0°C
(33°F)		3°C
(38°F)		9°C
(48°F)		10°C
(51°F)		7°C
(45°F)		1°C
(34°F)		-6°C
(21°F)		-13°C
(9°F)

Compare climate in Omu with other places

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

Monthly average precipitation in Omu, Japan

Omu usually has the most precipitation in August, October and November, with an average of 17 rainy days and 131 mm (5.2 inches) of precipitation per month. The driest months in Omu are January, February and April. On average, 62 mm (2.4 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Omu. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)63 (2.5)63 (2.5)73 (2.9)60 (2.3)87 (3.4)88 (3.5)82 (3.2)157 (6.2)80 (3.1)134 (5.3)102 (4.0)69 (2.7)
Average precipitation days (≥ 1 mm)14141311121291511142221

Monthly sunshine hours in Omu, Japan

The sunniest months in Omu are April, May and July, when the sun shines an average of 9 hours 38 minutes a day. Least sunny months in Omu: January, November and December receive an average of 5 hours 19 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Omu. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours136180240282285282318275269235179175
Mean daily daylight hours9h 13m10h 25m11h 55m13h 28m14h 48m15h 29m15h 8m13h 58m12h 29m10h 57m9h 35m8h 52m

Solar UV radiation in Omu, Japan

Omu experiences the highest level of ultraviolet (UV) radiation in June, July and August, when the maximum UV index can reach values of 9 - 9, which corresponds to the Very High category of sun exposure. January, February and December are in the Low / Moderate exposure category. In these months, the maximum values of the UV index do not exceed 3. For more detailed information, check out our hourly Omu UV Index data.

Average daily maximum UV levels by month for Omu. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)236789997532