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Monthly climate in Hachimantai, Japan

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Hachimantai features a humid continental climate (Dfb). Temperatures typically range between -4 °C (24 °F) and 22 °C (72 °F) through the year, but rarely can drop to -20 °C (-4 °F) or can rise to as high as 33 °C (92 °F). The average annual precipitation amounts to about 1296 mm (51.0 inches) and receives 167 rainy days on the 1 mm (0.04 inches) threshold annually. Hachimantai enjoys an average of 2772 hours of sunshine throughout the year, and daylight varies from 9 hours 22 minutes to 14 hours 56 minutes per day.

Monthly average temperatures in Hachimantai, Japan

The warmest months in Hachimantai are July, August and September, with daily mean temperatures ranging from 18 to 22 °C (64 - 72 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -4 to -1 °C (24 - 30 °F) throughout the day. On average each year, Hachimantai experiences 34 days above 25 °C (77.0 °F) and 121 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Hachimantai. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum5°C
(41°F)		8°C
(46°F)		17°C
(63°F)		23°C
(73°F)		29°C
(85°F)		29°C
(84°F)		32°C
(90°F)		33°C
(92°F)		31°C
(88°F)		26°C
(78°F)		18°C
(65°F)		12°C
(55°F)
Mean maximum4°C
(40°F)		6°C
(44°F)		14°C
(58°F)		20°C
(68°F)		26°C
(78°F)		25°C
(77°F)		30°C
(87°F)		31°C
(88°F)		27°C
(82°F)		23°C
(73°F)		16°C
(62°F)		9°C
(49°F)
Average high-1°C
(31°F)		0°C
(33°F)		6°C
(43°F)		11°C
(53°F)		18°C
(65°F)		21°C
(70°F)		25°C
(77°F)		26°C
(78°F)		22°C
(72°F)		16°C
(60°F)		9°C
(48°F)		2°C
(35°F)
Daily mean-4°C
(24°F)		-4°C
(26°F)		2°C
(35°F)		7°C
(44°F)		13°C
(56°F)		17°C
(63°F)		21°C
(71°F)		22°C
(72°F)		18°C
(64°F)		11°C
(53°F)		5°C
(41°F)		-1°C
(30°F)
Average low-9°C
(17°F)		-8°C
(18°F)		-2°C
(28°F)		2°C
(37°F)		9°C
(48°F)		13°C
(56°F)		18°C
(65°F)		19°C
(66°F)		14°C
(58°F)		7°C
(46°F)		1°C
(35°F)		-4°C
(24°F)
Mean minimum-16°C
(4°F)		-15°C
(5°F)		-10°C
(13°F)		-3°C
(26°F)		2°C
(37°F)		8°C
(47°F)		14°C
(57°F)		14°C
(57°F)		7°C
(45°F)		1°C
(34°F)		-5°C
(24°F)		-11°C
(13°F)
Minimum-18°C
(1°F)		-20°C
(-4°F)		-17°C
(1°F)		-10°C
(15°F)		2°C
(35°F)		5°C
(42°F)		12°C
(55°F)		10°C
(50°F)		3°C
(38°F)		0°C
(33°F)		-12°C
(11°F)		-12°C
(10°F)

Compare climate in Hachimantai with other places

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

Monthly average precipitation in Hachimantai, Japan

Hachimantai usually has the most precipitation in July, August and October, with an average of 15 rainy days and 151 mm (5.9 inches) of precipitation per month. The driest months in Hachimantai are January, February and November. On average, 71 mm (2.8 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Hachimantai. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)62 (2.4)84 (3.3)98 (3.9)119 (4.7)100 (3.9)113 (4.4)155 (6.1)145 (5.7)114 (4.5)152 (6.0)66 (2.6)87 (3.4)
Average precipitation days (≥ 1 mm)111514171313181613111115

Monthly sunshine hours in Hachimantai, Japan

The sunniest months in Hachimantai are May, June and July, when the sun shines an average of 9 hours 0 minutes a day. Least sunny months in Hachimantai: January, November and December receive an average of 5 hours 45 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Hachimantai. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours152199250258287271269254241210194181
Mean daily daylight hours9h 40m10h 40m11h 56m13h 15m14h 22m14h 56m14h 39m13h 40m12h 25m11h 7m9h 58m9h 22m

Solar UV radiation in Hachimantai, Japan

Hachimantai 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 Hachimantai UV Index data.

Average daily maximum UV levels by month for Hachimantai. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)346891110119643