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Monthly climate in Unnan, Japan

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Unnan features a humid subtropical climate (Cfa). Temperatures typically range between 4 °C (39 °F) and 27 °C (81 °F) through the year, but rarely can drop to -12 °C (11 °F) or can rise to as high as 36 °C (97 °F). The average annual precipitation amounts to about 1912 mm (75.3 inches) and receives 168 rainy days on the 1 mm (0.04 inches) threshold annually. Unnan enjoys an average of 2999 hours of sunshine throughout the year, and daylight varies from 9 hours 48 minutes to 14 hours 28 minutes per day.

Monthly average temperatures in Unnan, Japan

The warmest months in Unnan are July, August and September, with daily mean temperatures ranging from 22 to 27 °C (72 - 81 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 4 to 6 °C (39 - 43 °F) throughout the day. On average each year, Unnan experiences 88 days above 25 °C (77.0 °F) and 35 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Unnan. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum14°C
(58°F)		21°C
(70°F)		22°C
(71°F)		28°C
(82°F)		31°C
(88°F)		33°C
(92°F)		35°C
(95°F)		36°C
(97°F)		34°C
(93°F)		31°C
(88°F)		24°C
(76°F)		21°C
(69°F)
Mean maximum13°C
(55°F)		15°C
(59°F)		20°C
(69°F)		25°C
(77°F)		29°C
(85°F)		29°C
(85°F)		33°C
(92°F)		35°C
(96°F)		32°C
(89°F)		28°C
(84°F)		21°C
(71°F)		15°C
(60°F)
Average high7°C
(44°F)		8°C
(46°F)		13°C
(56°F)		17°C
(64°F)		23°C
(73°F)		25°C
(78°F)		29°C
(84°F)		31°C
(88°F)		26°C
(79°F)		21°C
(69°F)		15°C
(60°F)		9°C
(49°F)
Daily mean4°C
(39°F)		4°C
(40°F)		8°C
(47°F)		13°C
(55°F)		18°C
(65°F)		21°C
(70°F)		25°C
(78°F)		27°C
(81°F)		22°C
(72°F)		17°C
(62°F)		11°C
(52°F)		6°C
(43°F)
Average low0°C
(33°F)		0°C
(33°F)		4°C
(39°F)		8°C
(47°F)		14°C
(57°F)		17°C
(63°F)		23°C
(73°F)		24°C
(75°F)		19°C
(67°F)		13°C
(56°F)		7°C
(44°F)		3°C
(37°F)
Mean minimum-5°C
(23°F)		-6°C
(21°F)		-1°C
(30°F)		1°C
(34°F)		7°C
(45°F)		12°C
(54°F)		19°C
(66°F)		19°C
(67°F)		13°C
(56°F)		7°C
(45°F)		1°C
(34°F)		-2°C
(29°F)
Minimum-7°C
(19°F)		-12°C
(11°F)		-2°C
(28°F)		-1°C
(30°F)		5°C
(42°F)		10°C
(49°F)		18°C
(64°F)		17°C
(62°F)		12°C
(54°F)		6°C
(44°F)		-0°C
(32°F)		-3°C
(27°F)

Compare climate in Unnan with other places

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

Monthly average precipitation in Unnan, Japan

Unnan usually has the most precipitation in July, August and September, with an average of 16 rainy days and 267 mm (10.5 inches) of precipitation per month. The driest months in Unnan are January, February and November. On average, 85 mm (3.3 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Unnan. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)96 (3.8)102 (4.0)138 (5.4)125 (4.9)102 (4.0)197 (7.7)301 (11.9)263 (10.4)238 (9.4)172 (6.8)58 (2.3)121 (4.8)
Average precipitation days (≥ 1 mm)151414111014191615131017

Monthly sunshine hours in Unnan, Japan

The sunniest months in Unnan are May, June and August, when the sun shines an average of 9 hours 45 minutes a day. Least sunny months in Unnan: January, February and December receive an average of 6 hours 13 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Unnan. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours163211257279299294279303252243224191
Mean daily daylight hours10h 3m10h 53m11h 58m13h 4m14h 0m14h 28m14h 14m13h 25m12h 22m11h 16m10h 18m9h 48m

Solar UV radiation in Unnan, Japan

Unnan experiences the highest level of ultraviolet (UV) radiation in April, July and August, when the maximum UV index can reach values of 11 - 12, which corresponds to the 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 Unnan UV Index data.

Average daily maximum UV levels by month for Unnan. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)458111111121210753