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Monthly climate in Oga, Japan

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Oga features a humid subtropical climate (Cfa). Temperatures typically range between 3 °C (37 °F) and 25 °C (78 °F) through the year, but rarely can drop to -5 °C (23 °F) or can rise to as high as 31 °C (89 °F). The average annual precipitation amounts to about 2023 mm (79.6 inches) and receives 209 rainy days on the 1 mm (0.04 inches) threshold annually. Oga enjoys an average of 2935 hours of sunshine throughout the year, and daylight varies from 9 hours 22 minutes to 14 hours 56 minutes per day.

Monthly average temperatures in Oga, Japan

The warmest months in Oga are July, August and September, with daily mean temperatures ranging from 22 to 25 °C (72 - 78 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 3 to 6 °C (37 - 42 °F) throughout the day. On average each year, Oga experiences 35 days above 25 °C (77.0 °F) and 21 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Oga. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum12°C
(54°F)		11°C
(52°F)		13°C
(56°F)		16°C
(60°F)		21°C
(70°F)		25°C
(76°F)		30°C
(85°F)		31°C
(89°F)		30°C
(87°F)		25°C
(76°F)		19°C
(67°F)		17°C
(62°F)
Mean maximum9°C
(49°F)		10°C
(49°F)		12°C
(53°F)		14°C
(58°F)		20°C
(68°F)		22°C
(72°F)		28°C
(82°F)		30°C
(86°F)		27°C
(82°F)		23°C
(74°F)		19°C
(66°F)		14°C
(57°F)
Average high4°C
(40°F)		4°C
(40°F)		8°C
(46°F)		11°C
(51°F)		15°C
(60°F)		19°C
(67°F)		24°C
(76°F)		26°C
(80°F)		24°C
(75°F)		19°C
(66°F)		13°C
(56°F)		7°C
(46°F)
Daily mean3°C
(37°F)		3°C
(37°F)		6°C
(43°F)		9°C
(49°F)		14°C
(58°F)		18°C
(65°F)		23°C
(74°F)		25°C
(78°F)		22°C
(72°F)		17°C
(63°F)		11°C
(53°F)		6°C
(42°F)
Average low1°C
(34°F)		1°C
(35°F)		4°C
(40°F)		8°C
(46°F)		13°C
(56°F)		17°C
(63°F)		22°C
(72°F)		24°C
(76°F)		21°C
(70°F)		16°C
(61°F)		10°C
(50°F)		4°C
(40°F)
Mean minimum-3°C
(26°F)		-3°C
(28°F)		0°C
(33°F)		4°C
(39°F)		9°C
(49°F)		14°C
(57°F)		19°C
(67°F)		21°C
(69°F)		18°C
(64°F)		11°C
(52°F)		4°C
(40°F)		-1°C
(31°F)
Minimum-5°C
(23°F)		-4°C
(26°F)		-1°C
(30°F)		3°C
(37°F)		8°C
(47°F)		13°C
(55°F)		18°C
(65°F)		19°C
(66°F)		17°C
(63°F)		10°C
(50°F)		2°C
(37°F)		-3°C
(27°F)

Compare climate in Oga with other places

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

Monthly average precipitation in Oga, Japan

Oga usually has the most precipitation in August, October and December, with an average of 19 rainy days and 224 mm (8.8 inches) of precipitation per month. The driest months in Oga are March, April and May. On average, 126 mm (5.0 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Oga. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)148 (5.8)159 (6.3)116 (4.6)129 (5.1)133 (5.2)146 (5.8)160 (6.3)199 (7.8)165 (6.5)218 (8.6)194 (7.6)256 (10.1)
Average precipitation days (≥ 1 mm)222416151412131315162128

Monthly sunshine hours in Oga, Japan

The sunniest months in Oga are May, July and August, when the sun shines an average of 10 hours 1 minutes a day. Least sunny months in Oga: January, February and December receive an average of 5 hours 30 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Oga. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours144185242274305299313312265226193169
Mean daily daylight hours9h 40m10h 40m11h 56m13h 15m14h 22m14h 56m14h 39m13h 40m12h 25m11h 7m9h 58m9h 22m

Solar UV radiation in Oga, Japan

Oga 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 Oga UV Index data.

Average daily maximum UV levels by month for Oga. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)336891010119642