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Monthly climate in Oyama, Japan

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Oyama features a humid subtropical climate (Cfa). Temperatures typically range between 10 °C (49 °F) and 27 °C (81 °F) through the year, but rarely can drop to 2 °C (35 °F) or can rise to as high as 31 °C (88 °F). The average annual precipitation amounts to about 2375 mm (93.5 inches) and receives 153 rainy days on the 1 mm (0.04 inches) threshold annually. Oyama enjoys an average of 3087 hours of sunshine throughout the year, and daylight varies from 9 hours 52 minutes to 14 hours 25 minutes per day.

Monthly average temperatures in Oyama, Japan

The warmest months in Oyama are July, August and September, with daily mean temperatures ranging from 25 to 27 °C (78 - 81 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 10 to 12 °C (49 - 55 °F) throughout the day. On average each year, Oyama experiences 72 days above 25 °C (77.0 °F) and 0 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Oyama. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum18°C
(65°F)		19°C
(67°F)		19°C
(66°F)		22°C
(71°F)		24°C
(75°F)		26°C
(79°F)		29°C
(85°F)		31°C
(88°F)		29°C
(85°F)		27°C
(81°F)		23°C
(73°F)		22°C
(71°F)
Mean maximum16°C
(61°F)		17°C
(62°F)		18°C
(65°F)		20°C
(68°F)		23°C
(73°F)		25°C
(77°F)		28°C
(83°F)		30°C
(86°F)		28°C
(83°F)		26°C
(79°F)		22°C
(72°F)		19°C
(67°F)
Average high11°C
(52°F)		12°C
(53°F)		15°C
(58°F)		17°C
(63°F)		20°C
(69°F)		23°C
(74°F)		26°C
(79°F)		28°C
(83°F)		26°C
(80°F)		23°C
(73°F)		18°C
(66°F)		14°C
(57°F)
Daily mean10°C
(49°F)		10°C
(50°F)		13°C
(55°F)		16°C
(60°F)		19°C
(67°F)		22°C
(72°F)		25°C
(78°F)		27°C
(81°F)		25°C
(78°F)		22°C
(71°F)		17°C
(63°F)		12°C
(55°F)
Average low8°C
(47°F)		8°C
(47°F)		11°C
(52°F)		14°C
(58°F)		18°C
(65°F)		21°C
(71°F)		25°C
(77°F)		27°C
(80°F)		24°C
(76°F)		20°C
(69°F)		16°C
(61°F)		11°C
(52°F)
Mean minimum4°C
(39°F)		4°C
(40°F)		7°C
(45°F)		9°C
(49°F)		14°C
(58°F)		19°C
(66°F)		23°C
(73°F)		24°C
(76°F)		22°C
(71°F)		16°C
(62°F)		11°C
(52°F)		6°C
(43°F)
Minimum2°C
(35°F)		3°C
(37°F)		5°C
(41°F)		8°C
(46°F)		12°C
(54°F)		17°C
(63°F)		21°C
(71°F)		24°C
(75°F)		21°C
(69°F)		15°C
(60°F)		10°C
(50°F)		4°C
(39°F)

Compare climate in Oyama with other places

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

Monthly average precipitation in Oyama, Japan

Oyama usually has the most precipitation in June, July and October, with an average of 16 rainy days and 331 mm (13.0 inches) of precipitation per month. The driest months in Oyama are January, February and December. On average, 87 mm (3.4 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Oyama. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)70 (2.8)93 (3.7)189 (7.4)164 (6.4)213 (8.4)302 (11.9)363 (14.3)163 (6.4)255 (10.0)328 (12.9)137 (5.4)99 (3.9)
Average precipitation days (≥ 1 mm)7812101114181419171310

Monthly sunshine hours in Oyama, Japan

The sunniest months in Oyama are April, May and August, when the sun shines an average of 9 hours 47 minutes a day. Least sunny months in Oyama: January, February and October receive an average of 7 hours 1 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Oyama. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours187230265281295272280323261220234231
Mean daily daylight hours10h 6m10h 55m11h 58m13h 3m13h 57m14h 25m14h 11m13h 23m12h 21m11h 17m10h 21m9h 52m

Solar UV radiation in Oyama, Japan

Oyama experiences the highest level of ultraviolet (UV) radiation in May, July and August, when the maximum UV index can reach values of 11 - 12, which corresponds to the Extreme category of sun exposure. January, November 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 Oyama UV Index data.

Average daily maximum UV levels by month for Oyama. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)468101111121110754