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Monthly climate in Aioi, Japan

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Aioi features a humid subtropical climate (Cfa). Temperatures typically range between 6 °C (44 °F) and 27 °C (81 °F) through the year, but rarely can drop to -1 °C (30 °F) or can rise to as high as 32 °C (90 °F). The average annual precipitation amounts to about 1680 mm (66.1 inches) and receives 115 rainy days on the 1 mm (0.04 inches) threshold annually. Aioi enjoys an average of 3027 hours of sunshine throughout the year, and daylight varies from 9 hours 51 minutes to 14 hours 25 minutes per day.

Monthly average temperatures in Aioi, Japan

The warmest months in Aioi are July, August and September, with daily mean temperatures ranging from 24 to 27 °C (76 - 81 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 6 to 9 °C (44 - 49 °F) throughout the day. On average each year, Aioi experiences 69 days above 25 °C (77.0 °F) and 1 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Aioi. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum15°C
(59°F)		14°C
(58°F)		16°C
(62°F)		20°C
(68°F)		24°C
(75°F)		26°C
(79°F)		31°C
(89°F)		32°C
(90°F)		30°C
(87°F)		26°C
(80°F)		21°C
(71°F)		19°C
(66°F)
Mean maximum13°C
(55°F)		12°C
(55°F)		16°C
(60°F)		19°C
(66°F)		22°C
(72°F)		25°C
(77°F)		29°C
(85°F)		31°C
(88°F)		29°C
(85°F)		26°C
(78°F)		21°C
(69°F)		17°C
(62°F)
Average high9°C
(48°F)		9°C
(48°F)		12°C
(53°F)		15°C
(59°F)		19°C
(67°F)		23°C
(73°F)		27°C
(80°F)		29°C
(84°F)		26°C
(79°F)		22°C
(71°F)		16°C
(62°F)		11°C
(52°F)
Daily mean6°C
(44°F)		6°C
(44°F)		9°C
(49°F)		13°C
(56°F)		18°C
(64°F)		21°C
(71°F)		25°C
(78°F)		27°C
(81°F)		24°C
(76°F)		20°C
(68°F)		14°C
(58°F)		9°C
(49°F)
Average low5°C
(41°F)		4°C
(40°F)		7°C
(45°F)		11°C
(52°F)		16°C
(61°F)		20°C
(67°F)		24°C
(76°F)		26°C
(79°F)		23°C
(73°F)		18°C
(64°F)		12°C
(54°F)		7°C
(45°F)
Mean minimum1°C
(35°F)		1°C
(34°F)		4°C
(39°F)		6°C
(43°F)		11°C
(52°F)		16°C
(62°F)		22°C
(71°F)		23°C
(74°F)		19°C
(66°F)		13°C
(56°F)		8°C
(46°F)		3°C
(37°F)
Minimum-1°C
(31°F)		-1°C
(30°F)		3°C
(37°F)		5°C
(41°F)		10°C
(51°F)		15°C
(60°F)		21°C
(69°F)		21°C
(70°F)		18°C
(65°F)		13°C
(55°F)		7°C
(45°F)		1°C
(34°F)

Compare climate in Aioi with other places

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

Monthly average precipitation in Aioi, Japan

Aioi usually has the most precipitation in July, September and October, with an average of 14 rainy days and 256 mm (10.1 inches) of precipitation per month. The driest months in Aioi are January, February and November. On average, 47 mm (1.8 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Aioi. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)42 (1.7)55 (2.2)109 (4.3)132 (5.2)134 (5.3)160 (6.3)309 (12.2)180 (7.1)228 (9.0)229 (9.0)43 (1.7)56 (2.2)
Average precipitation days (≥ 1 mm)65989121712141157

Monthly sunshine hours in Aioi, Japan

The sunniest months in Aioi are April, May and August, when the sun shines an average of 9 hours 34 minutes a day. Least sunny months in Aioi: January, February and December receive an average of 6 hours 45 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Aioi. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours177224258280294279272306247239234212
Mean daily daylight hours10h 5m10h 54m11h 58m13h 3m13h 58m14h 25m14h 12m13h 24m12h 21m11h 16m10h 20m9h 51m

Solar UV radiation in Aioi, Japan

Aioi 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 Aioi UV Index data.

Average daily maximum UV levels by month for Aioi. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)458111111121110754