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Monthly climate in Innoshima, Japan

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Innoshima features a humid subtropical climate (Cfa). Temperatures typically range between 7 °C (45 °F) and 29 °C (84 °F) through the year, but rarely can drop to -1 °C (31 °F) or can rise to as high as 33 °C (92 °F). The average annual precipitation amounts to about 1525 mm (60.0 inches) and receives 121 rainy days on the 1 mm (0.04 inches) threshold annually. Innoshima enjoys an average of 3129 hours of sunshine throughout the year, and daylight varies from 9 hours 53 minutes to 14 hours 23 minutes per day.

Monthly average temperatures in Innoshima, Japan

The warmest months in Innoshima are July, August and September, with daily mean temperatures ranging from 25 to 29 °C (78 - 84 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 7 to 10 °C (45 - 50 °F) throughout the day. On average each year, Innoshima experiences 83 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 Innoshima. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum15°C
(60°F)		17°C
(62°F)		18°C
(64°F)		23°C
(73°F)		27°C
(80°F)		28°C
(82°F)		33°C
(92°F)		33°C
(92°F)		33°C
(91°F)		29°C
(85°F)		22°C
(72°F)		20°C
(68°F)
Mean maximum14°C
(57°F)		14°C
(57°F)		17°C
(63°F)		21°C
(69°F)		25°C
(77°F)		27°C
(81°F)		31°C
(88°F)		33°C
(91°F)		31°C
(88°F)		27°C
(82°F)		21°C
(70°F)		17°C
(63°F)
Average high9°C
(49°F)		10°C
(50°F)		13°C
(56°F)		17°C
(62°F)		21°C
(70°F)		24°C
(76°F)		28°C
(83°F)		30°C
(87°F)		27°C
(81°F)		22°C
(72°F)		17°C
(63°F)		12°C
(53°F)
Daily mean7°C
(45°F)		7°C
(45°F)		11°C
(51°F)		14°C
(58°F)		19°C
(66°F)		22°C
(73°F)		26°C
(80°F)		29°C
(84°F)		25°C
(78°F)		20°C
(69°F)		15°C
(59°F)		10°C
(50°F)
Average low5°C
(42°F)		5°C
(41°F)		8°C
(47°F)		12°C
(53°F)		17°C
(62°F)		20°C
(69°F)		25°C
(77°F)		27°C
(80°F)		23°C
(74°F)		18°C
(65°F)		12°C
(54°F)		7°C
(46°F)
Mean minimum2°C
(35°F)		2°C
(35°F)		4°C
(39°F)		7°C
(44°F)		12°C
(54°F)		18°C
(64°F)		22°C
(72°F)		24°C
(75°F)		19°C
(66°F)		13°C
(56°F)		7°C
(46°F)		3°C
(38°F)
Minimum-1°C
(31°F)		-0°C
(32°F)		2°C
(37°F)		6°C
(43°F)		11°C
(53°F)		16°C
(62°F)		21°C
(70°F)		22°C
(72°F)		18°C
(65°F)		12°C
(53°F)		7°C
(45°F)		2°C
(36°F)

Compare climate in Innoshima with other places

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

Monthly average precipitation in Innoshima, Japan

Innoshima usually has the most precipitation in July, September and October, with an average of 12 rainy days and 221 mm (8.7 inches) of precipitation per month. The driest months in Innoshima are January, November and December. On average, 56 mm (2.2 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Innoshima. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)54 (2.1)67 (2.6)105 (4.1)122 (4.8)116 (4.6)151 (5.9)285 (11.2)133 (5.2)177 (7.0)201 (7.9)50 (2.0)64 (2.5)
Average precipitation days (≥ 1 mm)991089121581211711

Monthly sunshine hours in Innoshima, Japan

The sunniest months in Innoshima are May, June and August, when the sun shines an average of 9 hours 51 minutes a day. Least sunny months in Innoshima: January, February and December receive an average of 6 hours 59 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Innoshima. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours184231267284304292284309260250238221
Mean daily daylight hours10h 7m10h 56m11h 58m13h 2m13h 56m14h 23m14h 9m13h 22m12h 21m11h 17m10h 22m9h 53m

Solar UV radiation in Innoshima, Japan

Innoshima 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, 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 Innoshima UV Index data.

Average daily maximum UV levels by month for Innoshima. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)458101111121210764