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Monthly climate in Tosu, Japan

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Tosu features a humid subtropical climate (Cfa). Temperatures typically range between 6 °C (43 °F) and 28 °C (82 °F) through the year, but rarely can drop to -4 °C (25 °F) or can rise to as high as 36 °C (97 °F). The average annual precipitation amounts to about 2068 mm (81.4 inches) and receives 134 rainy days on the 1 mm (0.04 inches) threshold annually. Tosu enjoys an average of 3001 hours of sunshine throughout the year, and daylight varies from 9 hours 59 minutes to 14 hours 17 minutes per day.

Monthly average temperatures in Tosu, Japan

The warmest months in Tosu are July, August and September, with daily mean temperatures ranging from 24 to 28 °C (76 - 82 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 6 to 7 °C (43 - 46 °F) throughout the day. On average each year, Tosu experiences 112 days above 25 °C (77.0 °F) and 19 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Tosu. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum17°C
(63°F)		21°C
(70°F)		22°C
(73°F)		29°C
(84°F)		30°C
(86°F)		32°C
(90°F)		35°C
(95°F)		36°C
(97°F)		34°C
(94°F)		31°C
(88°F)		25°C
(76°F)		22°C
(72°F)
Mean maximum16°C
(60°F)		18°C
(64°F)		21°C
(70°F)		26°C
(79°F)		29°C
(84°F)		30°C
(87°F)		33°C
(92°F)		35°C
(96°F)		33°C
(91°F)		29°C
(85°F)		23°C
(74°F)		18°C
(65°F)
Average high10°C
(51°F)		11°C
(52°F)		16°C
(60°F)		20°C
(68°F)		24°C
(76°F)		27°C
(81°F)		30°C
(86°F)		32°C
(89°F)		28°C
(82°F)		23°C
(74°F)		18°C
(65°F)		12°C
(53°F)
Daily mean6°C
(43°F)		7°C
(44°F)		11°C
(52°F)		15°C
(59°F)		20°C
(68°F)		23°C
(74°F)		27°C
(80°F)		28°C
(82°F)		24°C
(76°F)		19°C
(66°F)		13°C
(55°F)		7°C
(46°F)
Average low2°C
(36°F)		2°C
(36°F)		6°C
(43°F)		10°C
(50°F)		15°C
(59°F)		19°C
(67°F)		24°C
(75°F)		25°C
(77°F)		21°C
(70°F)		15°C
(59°F)		8°C
(47°F)		3°C
(38°F)
Mean minimum-3°C
(27°F)		-2°C
(28°F)		0°C
(32°F)		3°C
(37°F)		8°C
(47°F)		15°C
(60°F)		21°C
(69°F)		21°C
(70°F)		15°C
(59°F)		8°C
(47°F)		1°C
(35°F)		-1°C
(30°F)
Minimum-4°C
(25°F)		-4°C
(25°F)		-2°C
(29°F)		2°C
(35°F)		6°C
(44°F)		13°C
(56°F)		18°C
(64°F)		19°C
(66°F)		13°C
(55°F)		7°C
(45°F)		-0°C
(31°F)		-2°C
(28°F)

Compare climate in Tosu with other places

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

Monthly average precipitation in Tosu, Japan

Tosu usually has the most precipitation in June, July and August, with an average of 16 rainy days and 338 mm (13.3 inches) of precipitation per month. The driest months in Tosu are January, November and December. On average, 61 mm (2.4 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Tosu. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)54 (2.1)85 (3.4)133 (5.2)124 (4.9)200 (7.9)233 (9.2)450 (17.7)331 (13.0)209 (8.2)120 (4.7)57 (2.2)71 (2.8)
Average precipitation days (≥ 1 mm)791191214191515977

Monthly sunshine hours in Tosu, Japan

The sunniest months in Tosu are April, May and August, when the sun shines an average of 9 hours 19 minutes a day. Least sunny months in Tosu: January, February and December receive an average of 6 hours 48 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Tosu. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours173232260279282259266296251253233213
Mean daily daylight hours10h 12m10h 58m11h 58m13h 0m13h 51m14h 17m14h 4m13h 19m12h 20m11h 19m10h 26m9h 59m

Solar UV radiation in Tosu, Japan

Tosu experiences the highest level of ultraviolet (UV) radiation in April, July and August, when the maximum UV index can reach values of 11 - 12, which corresponds to the Extreme category of sun exposure. January, February and December are in the Moderate / High exposure category. In these months, the maximum values of the UV index do not exceed 6. For more detailed information, check out our hourly Tosu UV Index data.

Average daily maximum UV levels by month for Tosu. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)468111111121211764