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Monthly climate in Iijima, Japan

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Iijima features a humid continental climate (Dfb). Temperatures typically range between -2 °C (29 °F) and 23 °C (74 °F) through the year, but rarely can drop to -21 °C (-5 °F) or can rise to as high as 33 °C (92 °F). The average annual precipitation amounts to about 1779 mm (70.0 inches) and receives 154 rainy days on the 1 mm (0.04 inches) threshold annually. Iijima enjoys an average of 3009 hours of sunshine throughout the year, and daylight varies from 9 hours 46 minutes to 14 hours 31 minutes per day.

Monthly average temperatures in Iijima, Japan

The warmest months in Iijima are July, August and September, with daily mean temperatures ranging from 19 to 23 °C (66 - 74 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -2 to 1 °C (29 - 34 °F) throughout the day. On average each year, Iijima experiences 50 days above 25 °C (77.0 °F) and 109 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Iijima. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum11°C
(52°F)		15°C
(59°F)		20°C
(68°F)		25°C
(78°F)		29°C
(84°F)		28°C
(82°F)		33°C
(91°F)		33°C
(92°F)		30°C
(86°F)		26°C
(78°F)		18°C
(65°F)		16°C
(61°F)
Mean maximum9°C
(48°F)		11°C
(52°F)		17°C
(63°F)		21°C
(71°F)		27°C
(80°F)		25°C
(78°F)		30°C
(87°F)		32°C
(89°F)		28°C
(82°F)		25°C
(77°F)		18°C
(64°F)		12°C
(54°F)
Average high3°C
(37°F)		4°C
(40°F)		10°C
(50°F)		14°C
(58°F)		20°C
(67°F)		22°C
(72°F)		26°C
(78°F)		28°C
(82°F)		23°C
(74°F)		18°C
(64°F)		12°C
(54°F)		6°C
(42°F)
Daily mean-2°C
(29°F)		-1°C
(31°F)		4°C
(40°F)		9°C
(48°F)		14°C
(58°F)		18°C
(64°F)		22°C
(71°F)		23°C
(74°F)		19°C
(66°F)		13°C
(56°F)		7°C
(45°F)		1°C
(34°F)
Average low-6°C
(22°F)		-5°C
(23°F)		-0°C
(32°F)		4°C
(39°F)		9°C
(49°F)		13°C
(56°F)		18°C
(65°F)		19°C
(67°F)		15°C
(60°F)		9°C
(49°F)		2°C
(36°F)		-3°C
(28°F)
Mean minimum-13°C
(9°F)		-14°C
(8°F)		-6°C
(22°F)		-3°C
(26°F)		2°C
(35°F)		8°C
(47°F)		15°C
(59°F)		15°C
(60°F)		9°C
(49°F)		2°C
(35°F)		-3°C
(27°F)		-8°C
(17°F)
Minimum-18°C
(-1°F)		-21°C
(-5°F)		-8°C
(18°F)		-6°C
(21°F)		-1°C
(31°F)		5°C
(42°F)		14°C
(57°F)		12°C
(54°F)		6°C
(44°F)		-0°C
(31°F)		-4°C
(24°F)		-10°C
(15°F)

Compare climate in Iijima with other places

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

Monthly average precipitation in Iijima, Japan

Iijima usually has the most precipitation in July, September and October, with an average of 16 rainy days and 243 mm (9.6 inches) of precipitation per month. The driest months in Iijima are January, November and December. On average, 71 mm (2.8 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Iijima. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)71 (2.8)82 (3.2)146 (5.7)148 (5.8)161 (6.3)151 (5.9)315 (12.4)150 (5.9)166 (6.6)247 (9.7)65 (2.6)77 (3.0)
Average precipitation days (≥ 1 mm)1091312131420151614810

Monthly sunshine hours in Iijima, Japan

The sunniest months in Iijima are April, May and August, when the sun shines an average of 9 hours 24 minutes a day. Least sunny months in Iijima: January, July and October receive an average of 7 hours 0 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Iijima. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours192240269281295264233289241225241235
Mean daily daylight hours10h 1m10h 52m11h 58m13h 5m14h 2m14h 31m14h 16m13h 27m12h 22m11h 15m10h 16m9h 46m

Solar UV radiation in Iijima, Japan

Iijima 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 / High exposure category. In these months, the maximum values of the UV index do not exceed 6. For more detailed information, check out our hourly Iijima UV Index data.

Average daily maximum UV levels by month for Iijima. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)469101111121210764