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Monthly climate in Yachimata, Japan

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Yachimata features a humid subtropical climate (Cfa). Temperatures typically range between 5 °C (42 °F) and 28 °C (82 °F) through the year, but rarely can drop to -6 °C (21 °F) or can rise to as high as 36 °C (98 °F). The average annual precipitation amounts to about 1577 mm (62.1 inches) and receives 143 rainy days on the 1 mm (0.04 inches) threshold annually. Yachimata enjoys an average of 2970 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 Yachimata, Japan

The warmest months in Yachimata are July, August and September, with daily mean temperatures ranging from 24 to 28 °C (75 - 82 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 5 to 8 °C (42 - 46 °F) throughout the day. On average each year, Yachimata experiences 94 days above 25 °C (77.0 °F) and 16 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Yachimata. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum17°C
(64°F)		20°C
(68°F)		23°C
(74°F)		27°C
(81°F)		32°C
(90°F)		33°C
(91°F)		36°C
(98°F)		36°C
(97°F)		35°C
(94°F)		31°C
(88°F)		23°C
(75°F)		21°C
(71°F)
Mean maximum15°C
(60°F)		17°C
(62°F)		21°C
(70°F)		25°C
(77°F)		29°C
(85°F)		29°C
(85°F)		33°C
(92°F)		35°C
(96°F)		33°C
(91°F)		29°C
(84°F)		22°C
(72°F)		18°C
(65°F)
Average high9°C
(49°F)		10°C
(51°F)		14°C
(58°F)		18°C
(65°F)		23°C
(74°F)		26°C
(78°F)		29°C
(85°F)		31°C
(89°F)		27°C
(81°F)		22°C
(71°F)		17°C
(63°F)		12°C
(53°F)
Daily mean5°C
(42°F)		6°C
(44°F)		10°C
(51°F)		14°C
(58°F)		19°C
(67°F)		22°C
(72°F)		26°C
(79°F)		28°C
(82°F)		24°C
(75°F)		19°C
(66°F)		14°C
(57°F)		8°C
(46°F)
Average low2°C
(35°F)		2°C
(37°F)		6°C
(44°F)		10°C
(51°F)		16°C
(61°F)		19°C
(67°F)		23°C
(74°F)		25°C
(77°F)		21°C
(71°F)		16°C
(61°F)		10°C
(51°F)		4°C
(40°F)
Mean minimum-3°C
(27°F)		-2°C
(29°F)		1°C
(34°F)		5°C
(41°F)		10°C
(50°F)		16°C
(62°F)		20°C
(68°F)		21°C
(69°F)		17°C
(63°F)		11°C
(52°F)		5°C
(41°F)		-1°C
(31°F)
Minimum-6°C
(21°F)		-3°C
(28°F)		-1°C
(31°F)		2°C
(36°F)		8°C
(47°F)		15°C
(60°F)		18°C
(65°F)		18°C
(64°F)		14°C
(58°F)		9°C
(48°F)		3°C
(37°F)		-3°C
(27°F)

Compare climate in Yachimata with other places

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

Monthly average precipitation in Yachimata, Japan

Yachimata usually has the most precipitation in July, September and October, with an average of 16 rainy days and 221 mm (8.7 inches) of precipitation per month. The driest months in Yachimata are January, February and December. On average, 57 mm (2.2 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Yachimata. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)52 (2.1)46 (1.8)136 (5.4)116 (4.6)128 (5.0)161 (6.3)223 (8.8)102 (4.0)186 (7.3)254 (10.0)101 (4.0)71 (2.8)
Average precipitation days (≥ 1 mm)681311121317141714108

Monthly sunshine hours in Yachimata, Japan

The sunniest months in Yachimata are April, May and August, when the sun shines an average of 9 hours 25 minutes a day. Least sunny months in Yachimata: January, October and December receive an average of 6 hours 39 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Yachimata. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours186228255276288268263302244211223221
Mean daily daylight hours10h 1m10h 52m11h 57m13h 5m14h 2m14h 31m14h 17m13h 27m12h 22m11h 15m10h 16m9h 46m

Solar UV radiation in Yachimata, Japan

Yachimata 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, 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 Yachimata UV Index data.

Average daily maximum UV levels by month for Yachimata. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)3589111111119754