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Monthly climate in Kusatsu, Japan

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Kusatsu features a humid continental climate (Dfb). Temperatures typically range between -2 °C (29 °F) and 23 °C (74 °F) through the year, but rarely can drop to -12 °C (11 °F) or can rise to as high as 34 °C (93 °F). The average annual precipitation amounts to about 1643 mm (64.7 inches) and receives 201 rainy days on the 1 mm (0.04 inches) threshold annually. Kusatsu enjoys an average of 2905 hours of sunshine throughout the year, and daylight varies from 9 hours 41 minutes to 14 hours 36 minutes per day.

Monthly average temperatures in Kusatsu, Japan

The warmest months in Kusatsu are July, August and September, with daily mean temperatures ranging from 19 to 23 °C (66 - 74 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -2 to 1 °C (29 - 35 °F) throughout the day. On average each year, Kusatsu experiences 53 days above 25 °C (77.0 °F) and 110 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Kusatsu. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum9°C
(49°F)		17°C
(63°F)		21°C
(70°F)		27°C
(81°F)		30°C
(87°F)		30°C
(87°F)		33°C
(91°F)		34°C
(93°F)		29°C
(85°F)		26°C
(80°F)		20°C
(68°F)		18°C
(65°F)
Mean maximum8°C
(46°F)		12°C
(53°F)		18°C
(65°F)		22°C
(72°F)		28°C
(83°F)		26°C
(79°F)		30°C
(87°F)		32°C
(90°F)		28°C
(82°F)		25°C
(77°F)		18°C
(65°F)		12°C
(55°F)
Average high2°C
(36°F)		4°C
(39°F)		9°C
(49°F)		14°C
(58°F)		20°C
(69°F)		23°C
(73°F)		26°C
(79°F)		28°C
(82°F)		23°C
(73°F)		17°C
(63°F)		12°C
(53°F)		5°C
(42°F)
Daily mean-2°C
(29°F)		-1°C
(31°F)		4°C
(39°F)		9°C
(48°F)		15°C
(59°F)		18°C
(65°F)		22°C
(72°F)		23°C
(74°F)		19°C
(66°F)		13°C
(55°F)		7°C
(44°F)		1°C
(35°F)
Average low-5°C
(23°F)		-4°C
(24°F)		-1°C
(31°F)		3°C
(38°F)		9°C
(49°F)		14°C
(57°F)		18°C
(66°F)		20°C
(68°F)		15°C
(60°F)		9°C
(49°F)		2°C
(36°F)		-2°C
(28°F)
Mean minimum-10°C
(14°F)		-9°C
(15°F)		-6°C
(21°F)		-3°C
(27°F)		1°C
(35°F)		9°C
(49°F)		15°C
(60°F)		15°C
(60°F)		10°C
(50°F)		3°C
(38°F)		-3°C
(26°F)		-6°C
(22°F)
Minimum-12°C
(11°F)		-11°C
(12°F)		-8°C
(19°F)		-5°C
(24°F)		-0°C
(32°F)		6°C
(43°F)		14°C
(58°F)		11°C
(52°F)		7°C
(44°F)		1°C
(34°F)		-4°C
(24°F)		-8°C
(17°F)

Compare climate in Kusatsu with other places

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

Monthly average precipitation in Kusatsu, Japan

Kusatsu usually has the most precipitation in July, August and October, with an average of 21 rainy days and 224 mm (8.8 inches) of precipitation per month. The driest months in Kusatsu are January, February and November. On average, 66 mm (2.6 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Kusatsu. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)74 (2.9)74 (2.9)111 (4.4)112 (4.4)139 (5.5)168 (6.6)278 (10.9)177 (7.0)168 (6.6)217 (8.5)50 (2.0)76 (3.0)
Average precipitation days (≥ 1 mm)161414151618252219171015

Monthly sunshine hours in Kusatsu, Japan

The sunniest months in Kusatsu are April, May and August, when the sun shines an average of 9 hours 10 minutes a day. Least sunny months in Kusatsu: January, October and December receive an average of 6 hours 34 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Kusatsu. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours183231260278286266236278228209226218
Mean daily daylight hours9h 57m10h 49m11h 57m13h 7m14h 6m14h 36m14h 21m13h 30m12h 23m11h 13m10h 12m9h 41m

Solar UV radiation in Kusatsu, Japan

Kusatsu 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 Kusatsu UV Index data.

Average daily maximum UV levels by month for Kusatsu. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)46891111111110753