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Monthly climate in Kosaka, Japan

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Kosaka features a humid continental climate (Dfa). Temperatures typically range between -3 °C (26 °F) and 22 °C (73 °F) through the year, but rarely can drop to -21 °C (-6 °F) or can rise to as high as 33 °C (93 °F). The average annual precipitation amounts to about 1543 mm (60.8 inches) and receives 198 rainy days on the 1 mm (0.04 inches) threshold annually. Kosaka enjoys an average of 2917 hours of sunshine throughout the year, and daylight varies from 9 hours 19 minutes to 14 hours 59 minutes per day.

Monthly average temperatures in Kosaka, Japan

The warmest months in Kosaka are July, August and September, with daily mean temperatures ranging from 18 to 22 °C (65 - 73 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -3 to -1 °C (26 - 30 °F) throughout the day. On average each year, Kosaka experiences 40 days above 25 °C (77.0 °F) and 115 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Kosaka. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum5°C
(41°F)		8°C
(47°F)		16°C
(61°F)		22°C
(72°F)		29°C
(84°F)		29°C
(84°F)		32°C
(90°F)		33°C
(93°F)		33°C
(91°F)		25°C
(78°F)		19°C
(67°F)		12°C
(54°F)
Mean maximum4°C
(39°F)		6°C
(44°F)		13°C
(56°F)		19°C
(67°F)		25°C
(78°F)		25°C
(76°F)		30°C
(86°F)		32°C
(90°F)		29°C
(84°F)		23°C
(73°F)		17°C
(63°F)		9°C
(49°F)
Average high-1°C
(31°F)		0°C
(33°F)		5°C
(42°F)		12°C
(53°F)		18°C
(65°F)		21°C
(71°F)		25°C
(78°F)		26°C
(79°F)		23°C
(73°F)		16°C
(61°F)		9°C
(49°F)		2°C
(35°F)
Daily mean-3°C
(26°F)		-3°C
(28°F)		2°C
(35°F)		7°C
(45°F)		14°C
(57°F)		17°C
(63°F)		22°C
(71°F)		22°C
(73°F)		18°C
(65°F)		12°C
(54°F)		6°C
(42°F)		-1°C
(30°F)
Average low-7°C
(20°F)		-6°C
(22°F)		-2°C
(29°F)		3°C
(37°F)		9°C
(49°F)		13°C
(56°F)		19°C
(66°F)		19°C
(67°F)		14°C
(58°F)		8°C
(47°F)		2°C
(36°F)		-4°C
(25°F)
Mean minimum-14°C
(7°F)		-12°C
(12°F)		-9°C
(16°F)		-3°C
(27°F)		3°C
(38°F)		8°C
(47°F)		14°C
(57°F)		14°C
(57°F)		8°C
(46°F)		2°C
(35°F)		-5°C
(23°F)		-10°C
(14°F)
Minimum-21°C
(-6°F)		-13°C
(9°F)		-12°C
(10°F)		-6°C
(21°F)		2°C
(37°F)		6°C
(43°F)		13°C
(55°F)		11°C
(52°F)		5°C
(41°F)		1°C
(33°F)		-13°C
(9°F)		-11°C
(12°F)

Compare climate in Kosaka with other places

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

Monthly average precipitation in Kosaka, Japan

Kosaka usually has the most precipitation in July, August and October, with an average of 15 rainy days and 171 mm (6.7 inches) of precipitation per month. The driest months in Kosaka are January, March and November. On average, 95 mm (3.8 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Kosaka. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)78 (3.1)108 (4.3)107 (4.2)127 (5.0)116 (4.6)142 (5.6)168 (6.6)179 (7.1)137 (5.4)166 (6.5)100 (4.0)114 (4.5)
Average precipitation days (≥ 1 mm)172117171413181613131623

Monthly sunshine hours in Kosaka, Japan

The sunniest months in Kosaka are May, June and July, when the sun shines an average of 9 hours 39 minutes a day. Least sunny months in Kosaka: January, November and December receive an average of 5 hours 51 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Kosaka. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours156201251268299288300283258225197185
Mean daily daylight hours9h 38m10h 38m11h 56m13h 17m14h 25m14h 59m14h 42m13h 42m12h 25m11h 6m9h 56m9h 19m

Solar UV radiation in Kosaka, Japan

Kosaka experiences the highest level of ultraviolet (UV) radiation in June, July and August, when the maximum UV index can reach values of 10 - 11, which corresponds to the Very High / Extreme category of sun exposure. January, February and December are in the Low / Moderate exposure category. In these months, the maximum values of the UV index do not exceed 4. For more detailed information, check out our hourly Kosaka UV Index data.

Average daily maximum UV levels by month for Kosaka. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)346891010119642