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Monthly climate in Yaotsu, Japan

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Yaotsu features a humid subtropical climate (Cfa). Temperatures typically range between 3 °C (37 °F) and 26 °C (80 °F) through the year, but rarely can drop to -9 °C (16 °F) or can rise to as high as 37 °C (99 °F). The average annual precipitation amounts to about 2347 mm (92.4 inches) and receives 164 rainy days on the 1 mm (0.04 inches) threshold annually. Yaotsu enjoys an average of 3005 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 Yaotsu, Japan

The warmest months in Yaotsu are July, August and September, with daily mean temperatures ranging from 22 to 26 °C (72 - 80 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 3 to 5 °C (37 - 41 °F) throughout the day. On average each year, Yaotsu experiences 91 days above 25 °C (77.0 °F) and 56 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Yaotsu. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum15°C
(58°F)		18°C
(65°F)		22°C
(72°F)		26°C
(79°F)		30°C
(87°F)		30°C
(86°F)		37°C
(99°F)		37°C
(99°F)		34°C
(94°F)		30°C
(86°F)		22°C
(72°F)		18°C
(66°F)
Mean maximum13°C
(55°F)		14°C
(58°F)		20°C
(67°F)		24°C
(75°F)		28°C
(83°F)		28°C
(83°F)		33°C
(92°F)		35°C
(96°F)		32°C
(89°F)		28°C
(83°F)		21°C
(70°F)		15°C
(60°F)
Average high7°C
(45°F)		8°C
(47°F)		13°C
(56°F)		17°C
(64°F)		22°C
(73°F)		25°C
(77°F)		28°C
(83°F)		31°C
(87°F)		26°C
(80°F)		21°C
(71°F)		16°C
(61°F)		9°C
(49°F)
Daily mean3°C
(37°F)		3°C
(38°F)		8°C
(46°F)		12°C
(54°F)		17°C
(63°F)		21°C
(70°F)		25°C
(77°F)		26°C
(80°F)		22°C
(72°F)		17°C
(62°F)		10°C
(51°F)		5°C
(41°F)
Average low-1°C
(31°F)		-1°C
(31°F)		3°C
(37°F)		7°C
(45°F)		12°C
(54°F)		17°C
(62°F)		22°C
(71°F)		23°C
(73°F)		19°C
(66°F)		13°C
(55°F)		5°C
(42°F)		1°C
(34°F)
Mean minimum-6°C
(22°F)		-5°C
(23°F)		-1°C
(30°F)		0°C
(33°F)		4°C
(40°F)		11°C
(53°F)		18°C
(65°F)		19°C
(66°F)		13°C
(56°F)		6°C
(43°F)		-0°C
(32°F)		-2°C
(28°F)
Minimum-9°C
(16°F)		-8°C
(18°F)		-3°C
(27°F)		-2°C
(29°F)		2°C
(36°F)		9°C
(49°F)		17°C
(63°F)		17°C
(63°F)		10°C
(50°F)		5°C
(41°F)		-1°C
(30°F)		-3°C
(27°F)

Compare climate in Yaotsu with other places

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

Monthly average precipitation in Yaotsu, Japan

Yaotsu usually has the most precipitation in July, August and September, with an average of 20 rainy days and 331 mm (13.0 inches) of precipitation per month. The driest months in Yaotsu are January, November and December. On average, 77 mm (3.0 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Yaotsu. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)72 (2.9)92 (3.6)165 (6.5)207 (8.1)218 (8.6)220 (8.7)483 (19.0)270 (10.6)241 (9.5)219 (8.6)77 (3.0)83 (3.3)
Average precipitation days (≥ 1 mm)1191213131425191713810

Monthly sunshine hours in Yaotsu, Japan

The sunniest months in Yaotsu are April, May and August, when the sun shines an average of 9 hours 26 minutes a day. Least sunny months in Yaotsu: January, February and December receive an average of 6 hours 55 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Yaotsu. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours179232266279293268253295244235238217
Mean daily daylight hours10h 2m10h 53m11h 58m13h 5m14h 1m14h 29m14h 15m13h 26m12h 22m11h 15m10h 17m9h 47m

Solar UV radiation in Yaotsu, Japan

Yaotsu 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, 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 Yaotsu UV Index data.

Average daily maximum UV levels by month for Yaotsu. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)468101111121110754