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Monthly climate in Oma, Japan

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Oma features a humid continental climate (Dfb). Temperatures typically range between 1 °C (34 °F) and 21 °C (71 °F) through the year, but rarely can drop to -7 °C (19 °F) or can rise to as high as 27 °C (80 °F). The average annual precipitation amounts to about 1472 mm (58.0 inches) and receives 187 rainy days on the 1 mm (0.04 inches) threshold annually. Oma enjoys an average of 2899 hours of sunshine throughout the year, and daylight varies from 9 hours 12 minutes to 15 hours 6 minutes per day.

Monthly average temperatures in Oma, Japan

The warmest months in Oma are July, August and September, with daily mean temperatures ranging from 19 to 21 °C (66 - 71 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 1 to 3 °C (34 - 38 °F) throughout the day. On average each year, Oma experiences 2 days above 25 °C (77.0 °F) and 41 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Oma. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum10°C
(49°F)		8°C
(47°F)		11°C
(53°F)		14°C
(57°F)		17°C
(64°F)		20°C
(68°F)		24°C
(76°F)		27°C
(80°F)		27°C
(80°F)		23°C
(74°F)		17°C
(63°F)		15°C
(59°F)
Mean maximum8°C
(47°F)		7°C
(45°F)		10°C
(51°F)		12°C
(55°F)		15°C
(60°F)		17°C
(64°F)		23°C
(74°F)		25°C
(77°F)		25°C
(77°F)		21°C
(71°F)		17°C
(62°F)		12°C
(54°F)
Average high3°C
(37°F)		2°C
(36°F)		6°C
(43°F)		9°C
(48°F)		12°C
(54°F)		15°C
(60°F)		19°C
(67°F)		22°C
(72°F)		21°C
(71°F)		17°C
(63°F)		11°C
(52°F)		5°C
(42°F)
Daily mean1°C
(34°F)		1°C
(34°F)		4°C
(40°F)		7°C
(46°F)		11°C
(52°F)		14°C
(58°F)		19°C
(66°F)		21°C
(71°F)		20°C
(69°F)		16°C
(61°F)		9°C
(49°F)		3°C
(38°F)
Average low-0°C
(32°F)		-1°C
(31°F)		3°C
(38°F)		6°C
(43°F)		10°C
(50°F)		14°C
(57°F)		18°C
(65°F)		21°C
(70°F)		20°C
(67°F)		15°C
(59°F)		8°C
(46°F)		2°C
(36°F)
Mean minimum-6°C
(22°F)		-5°C
(23°F)		-1°C
(30°F)		2°C
(36°F)		7°C
(45°F)		11°C
(52°F)		15°C
(60°F)		18°C
(65°F)		16°C
(61°F)		9°C
(49°F)		2°C
(36°F)		-3°C
(27°F)
Minimum-7°C
(20°F)		-7°C
(19°F)		-3°C
(27°F)		1°C
(35°F)		6°C
(43°F)		10°C
(50°F)		13°C
(56°F)		17°C
(63°F)		15°C
(59°F)		8°C
(47°F)		-1°C
(30°F)		-4°C
(25°F)

Compare climate in Oma with other places

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

Monthly average precipitation in Oma, Japan

Oma usually has the most precipitation in August, October and December, with an average of 18 rainy days and 166 mm (6.5 inches) of precipitation per month. The driest months in Oma are March, April and May. On average, 95 mm (3.7 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Oma. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)117 (4.6)115 (4.5)94 (3.7)97 (3.8)95 (3.8)107 (4.2)100 (3.9)171 (6.7)116 (4.6)159 (6.3)133 (5.2)167 (6.6)
Average precipitation days (≥ 1 mm)202115141111101312151827

Monthly sunshine hours in Oma, Japan

The sunniest months in Oma are May, June and July, when the sun shines an average of 9 hours 27 minutes a day. Least sunny months in Oma: January, November and December receive an average of 5 hours 43 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Oma. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours153202256282299287283269260230191181
Mean daily daylight hours9h 31m10h 35m11h 56m13h 19m14h 30m15h 6m14h 48m13h 46m12h 26m11h 3m9h 50m9h 12m

Solar UV radiation in Oma, Japan

Oma 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 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 Oma UV Index data.

Average daily maximum UV levels by month for Oma. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)235891010118632