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Monthly climate in Iwaizumi, Japan

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Iwaizumi features a humid continental climate (Dfb). Temperatures typically range between -2 °C (29 °F) and 22 °C (71 °F) through the year, but rarely can drop to -15 °C (4 °F) or can rise to as high as 31 °C (88 °F). The average annual precipitation amounts to about 1395 mm (54.9 inches) and receives 153 rainy days on the 1 mm (0.04 inches) threshold annually. Iwaizumi enjoys an average of 2865 hours of sunshine throughout the year, and daylight varies from 9 hours 23 minutes to 14 hours 56 minutes per day.

Monthly average temperatures in Iwaizumi, Japan

The warmest months in Iwaizumi are July, August and September, with daily mean temperatures ranging from 18 to 22 °C (65 - 71 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -2 to 0 °C (29 - 33 °F) throughout the day. On average each year, Iwaizumi experiences 22 days above 25 °C (77.0 °F) and 100 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Iwaizumi. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum8°C
(46°F)		9°C
(49°F)		16°C
(62°F)		22°C
(71°F)		28°C
(83°F)		27°C
(81°F)		30°C
(86°F)		31°C
(88°F)		29°C
(85°F)		25°C
(77°F)		18°C
(65°F)		15°C
(59°F)
Mean maximum6°C
(43°F)		8°C
(46°F)		14°C
(57°F)		18°C
(65°F)		24°C
(75°F)		24°C
(75°F)		28°C
(83°F)		30°C
(86°F)		27°C
(80°F)		22°C
(72°F)		17°C
(62°F)		11°C
(52°F)
Average high1°C
(34°F)		2°C
(35°F)		6°C
(44°F)		11°C
(52°F)		17°C
(62°F)		19°C
(67°F)		23°C
(74°F)		24°C
(76°F)		21°C
(70°F)		16°C
(61°F)		10°C
(50°F)		3°C
(38°F)
Daily mean-2°C
(29°F)		-2°C
(29°F)		3°C
(37°F)		7°C
(45°F)		13°C
(55°F)		16°C
(61°F)		20°C
(69°F)		22°C
(71°F)		18°C
(65°F)		12°C
(55°F)		6°C
(44°F)		0°C
(33°F)
Average low-5°C
(24°F)		-5°C
(23°F)		-1°C
(31°F)		3°C
(38°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)		3°C
(38°F)		-2°C
(28°F)
Mean minimum-11°C
(13°F)		-11°C
(12°F)		-8°C
(18°F)		-2°C
(29°F)		4°C
(39°F)		9°C
(49°F)		14°C
(57°F)		15°C
(59°F)		10°C
(50°F)		4°C
(40°F)		-2°C
(29°F)		-8°C
(18°F)
Minimum-14°C
(7°F)		-15°C
(4°F)		-12°C
(12°F)		-6°C
(21°F)		2°C
(37°F)		7°C
(45°F)		12°C
(54°F)		12°C
(54°F)		7°C
(44°F)		3°C
(37°F)		-3°C
(26°F)		-10°C
(15°F)

Compare climate in Iwaizumi with other places

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

Monthly average precipitation in Iwaizumi, Japan

Iwaizumi usually has the most precipitation in July, August and October, with an average of 16 rainy days and 192 mm (7.6 inches) of precipitation per month. The driest months in Iwaizumi are January, November and December. On average, 52 mm (2.1 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Iwaizumi. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)49 (1.9)67 (2.6)102 (4.0)119 (4.7)106 (4.2)108 (4.3)178 (7.0)199 (7.8)157 (6.2)200 (7.9)45 (1.8)63 (2.5)
Average precipitation days (≥ 1 mm)9101215131318181412811

Monthly sunshine hours in Iwaizumi, Japan

The sunniest months in Iwaizumi are May, June and July, when the sun shines an average of 9 hours 9 minutes a day. Least sunny months in Iwaizumi: January, November and December receive an average of 6 hours 10 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Iwaizumi. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours161215260266295280267255243214209198
Mean daily daylight hours9h 40m10h 40m11h 56m13h 15m14h 22m14h 56m14h 39m13h 40m12h 25m11h 7m9h 58m9h 23m

Solar UV radiation in Iwaizumi, Japan

Iwaizumi experiences the highest level of ultraviolet (UV) radiation in June, July and August, when the maximum UV index can reach values of 10 - 11, which corresponds to the Very High / 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 4. For more detailed information, check out our hourly Iwaizumi UV Index data.

Average daily maximum UV levels by month for Iwaizumi. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)346991110119643