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Monthly climate in Kumamoto, Japan

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Kumamoto features a humid subtropical climate (Cfa). Temperatures typically range between 6 °C (44 °F) and 27 °C (82 °F) through the year, but rarely can drop to -3 °C (27 °F) or can rise to as high as 34 °C (94 °F). The average annual precipitation amounts to about 2024 mm (79.7 inches) and receives 141 rainy days on the 1 mm (0.04 inches) threshold annually. Kumamoto enjoys an average of 3015 hours of sunshine throughout the year, and daylight varies from 10 hours 1 minutes to 14 hours 14 minutes per day.

Monthly average temperatures in Kumamoto, Japan

The warmest months in Kumamoto are July, August and September, with daily mean temperatures ranging from 24 to 27 °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 8 °C (44 - 47 °F) throughout the day. On average each year, Kumamoto experiences 97 days above 25 °C (77.0 °F) and 6 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Kumamoto. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum17°C
(63°F)		19°C
(66°F)		22°C
(72°F)		26°C
(79°F)		28°C
(83°F)		30°C
(87°F)		34°C
(93°F)		34°C
(94°F)		34°C
(93°F)		30°C
(87°F)		24°C
(76°F)		22°C
(71°F)
Mean maximum15°C
(60°F)		16°C
(61°F)		20°C
(69°F)		24°C
(75°F)		27°C
(81°F)		29°C
(84°F)		32°C
(91°F)		34°C
(94°F)		32°C
(89°F)		28°C
(83°F)		23°C
(73°F)		18°C
(65°F)
Average high9°C
(49°F)		10°C
(51°F)		15°C
(59°F)		19°C
(66°F)		23°C
(73°F)		26°C
(78°F)		29°C
(84°F)		30°C
(87°F)		27°C
(81°F)		23°C
(74°F)		17°C
(63°F)		11°C
(52°F)
Daily mean6°C
(44°F)		7°C
(45°F)		11°C
(52°F)		15°C
(59°F)		19°C
(67°F)		23°C
(73°F)		26°C
(79°F)		27°C
(82°F)		24°C
(76°F)		19°C
(67°F)		13°C
(56°F)		8°C
(47°F)
Average low3°C
(39°F)		4°C
(39°F)		7°C
(46°F)		11°C
(52°F)		16°C
(61°F)		20°C
(68°F)		24°C
(75°F)		25°C
(77°F)		22°C
(71°F)		16°C
(61°F)		10°C
(50°F)		5°C
(41°F)
Mean minimum-1°C
(30°F)		-1°C
(31°F)		2°C
(36°F)		5°C
(41°F)		10°C
(50°F)		16°C
(61°F)		21°C
(69°F)		22°C
(72°F)		16°C
(62°F)		10°C
(51°F)		4°C
(39°F)		1°C
(33°F)
Minimum-3°C
(27°F)		-2°C
(29°F)		1°C
(34°F)		3°C
(38°F)		8°C
(46°F)		15°C
(58°F)		18°C
(64°F)		19°C
(67°F)		14°C
(57°F)		9°C
(49°F)		2°C
(36°F)		-0°C
(32°F)

Compare climate in Kumamoto with other places

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

Monthly average precipitation in Kumamoto, Japan

Kumamoto usually has the most precipitation in June, July and August, with an average of 15 rainy days and 308 mm (12.1 inches) of precipitation per month. The driest months in Kumamoto are January, November and December. On average, 74 mm (2.9 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Kumamoto. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)63 (2.5)105 (4.2)143 (5.6)135 (5.3)207 (8.1)280 (11.0)406 (16.0)238 (9.4)171 (6.7)117 (4.6)76 (3.0)84 (3.3)
Average precipitation days (≥ 1 mm)8111491215171414999

Monthly sunshine hours in Kumamoto, Japan

The sunniest months in Kumamoto are April, May and August, when the sun shines an average of 9 hours 15 minutes a day. Least sunny months in Kumamoto: January, November and December receive an average of 7 hours 3 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Kumamoto. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours188236264280278248260293250253235225
Mean daily daylight hours10h 15m11h 0m11h 59m12h 59m13h 49m14h 14m14h 2m13h 18m12h 20m11h 20m10h 28m10h 1m

Solar UV radiation in Kumamoto, Japan

Kumamoto experiences the highest level of ultraviolet (UV) radiation in May, July and August, when the maximum UV index can reach values of 12 - 13, 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 Kumamoto UV Index data.

Average daily maximum UV levels by month for Kumamoto. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)569111212121311864