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Monthly climate in Yamagata, Japan

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Yamagata features a humid subtropical climate (Cfa). Temperatures typically range between 4 °C (39 °F) and 27 °C (82 °F) through the year, but rarely can drop to -8 °C (18 °F) or can rise to as high as 38 °C (100 °F). The average annual precipitation amounts to about 2542 mm (100.1 inches) and receives 159 rainy days on the 1 mm (0.04 inches) threshold annually. Yamagata enjoys an average of 3022 hours of sunshine throughout the year, and daylight varies from 9 hours 47 minutes to 14 hours 29 minutes per day.

Monthly average temperatures in Yamagata, Japan

The warmest months in Yamagata are July, August and September, with daily mean temperatures ranging from 23 to 27 °C (74 - 82 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 4 to 6 °C (39 - 43 °F) throughout the day. On average each year, Yamagata experiences 100 days above 25 °C (77.0 °F) and 29 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Yamagata. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum16°C
(60°F)		20°C
(68°F)		23°C
(74°F)		27°C
(82°F)		30°C
(87°F)		31°C
(89°F)		37°C
(100°F)		38°C
(100°F)		35°C
(95°F)		31°C
(88°F)		22°C
(72°F)		18°C
(65°F)
Mean maximum13°C
(56°F)		15°C
(60°F)		20°C
(69°F)		25°C
(78°F)		29°C
(85°F)		29°C
(85°F)		34°C
(94°F)		36°C
(97°F)		33°C
(91°F)		29°C
(84°F)		22°C
(72°F)		16°C
(61°F)
Average high8°C
(46°F)		9°C
(48°F)		14°C
(57°F)		18°C
(65°F)		23°C
(73°F)		26°C
(79°F)		29°C
(85°F)		32°C
(89°F)		27°C
(81°F)		22°C
(72°F)		17°C
(62°F)		10°C
(51°F)
Daily mean4°C
(39°F)		4°C
(40°F)		9°C
(48°F)		13°C
(56°F)		18°C
(65°F)		22°C
(71°F)		26°C
(78°F)		27°C
(82°F)		23°C
(74°F)		18°C
(64°F)		12°C
(53°F)		6°C
(43°F)
Average low0°C
(33°F)		1°C
(34°F)		4°C
(40°F)		9°C
(48°F)		14°C
(57°F)		18°C
(65°F)		23°C
(73°F)		24°C
(76°F)		20°C
(69°F)		14°C
(58°F)		8°C
(46°F)		3°C
(37°F)
Mean minimum-4°C
(24°F)		-4°C
(26°F)		-0°C
(32°F)		2°C
(35°F)		7°C
(44°F)		14°C
(57°F)		20°C
(68°F)		20°C
(69°F)		15°C
(59°F)		8°C
(48°F)		2°C
(36°F)		-2°C
(29°F)
Minimum-8°C
(18°F)		-7°C
(20°F)		-1°C
(31°F)		-0°C
(32°F)		5°C
(42°F)		12°C
(53°F)		18°C
(65°F)		18°C
(64°F)		12°C
(54°F)		6°C
(43°F)		1°C
(33°F)		-5°C
(23°F)

Compare climate in Yamagata with other places

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

Monthly average precipitation in Yamagata, Japan

Yamagata usually has the most precipitation in July, August and September, with an average of 18 rainy days and 371 mm (14.6 inches) of precipitation per month. The driest months in Yamagata are January, February and November. On average, 75 mm (2.9 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Yamagata. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)71 (2.8)79 (3.1)179 (7.1)223 (8.8)229 (9.0)245 (9.7)493 (19.4)322 (12.7)298 (11.7)234 (9.2)74 (2.9)94 (3.7)
Average precipitation days (≥ 1 mm)1191312121322181614712

Monthly sunshine hours in Yamagata, Japan

The sunniest months in Yamagata are April, May and August, when the sun shines an average of 9 hours 30 minutes a day. Least sunny months in Yamagata: January, February and December receive an average of 6 hours 51 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Yamagata. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours180228265279294273262299246239236215
Mean daily daylight hours10h 3m10h 53m11h 58m13h 5m14h 1m14h 29m14h 15m13h 26m12h 22m11h 15m10h 17m9h 47m

Solar UV radiation in Yamagata, Japan

Yamagata experiences the highest level of ultraviolet (UV) radiation in May, July and August, when the maximum UV index can reach values of 11 - 11, which corresponds to the Extreme category of sun exposure. January, November 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 Yamagata UV Index data.

Average daily maximum UV levels by month for Yamagata. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)468101111111110753