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Monthly climate in Muroran, Japan

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Muroran features a humid continental climate (Dfb). Temperatures typically range between -1 °C (30 °F) and 21 °C (70 °F) through the year, but rarely can drop to -10 °C (14 °F) or can rise to as high as 27 °C (82 °F). The average annual precipitation amounts to about 1284 mm (50.6 inches) and receives 155 rainy days on the 1 mm (0.04 inches) threshold annually. Muroran enjoys an average of 2896 hours of sunshine throughout the year, and daylight varies from 9 hours 7 minutes to 15 hours 12 minutes per day.

Monthly average temperatures in Muroran, Japan

The warmest months in Muroran are July, August and September, with daily mean temperatures ranging from 19 to 21 °C (66 - 70 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -1 to 1 °C (30 - 35 °F) throughout the day. On average each year, Muroran experiences 3 days above 25 °C (77.0 °F) and 80 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Muroran. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum8°C
(47°F)		6°C
(43°F)		10°C
(50°F)		15°C
(59°F)		22°C
(73°F)		20°C
(69°F)		26°C
(79°F)		27°C
(82°F)		27°C
(81°F)		23°C
(73°F)		17°C
(62°F)		13°C
(56°F)
Mean maximum7°C
(44°F)		5°C
(41°F)		8°C
(46°F)		12°C
(54°F)		17°C
(63°F)		18°C
(65°F)		24°C
(76°F)		26°C
(79°F)		24°C
(76°F)		21°C
(69°F)		16°C
(61°F)		11°C
(52°F)
Average high1°C
(33°F)		0°C
(33°F)		4°C
(39°F)		7°C
(45°F)		12°C
(54°F)		16°C
(61°F)		20°C
(68°F)		22°C
(72°F)		20°C
(69°F)		16°C
(61°F)		10°C
(50°F)		3°C
(38°F)
Daily mean-1°C
(30°F)		-1°C
(30°F)		2°C
(36°F)		6°C
(42°F)		10°C
(50°F)		14°C
(58°F)		19°C
(66°F)		21°C
(70°F)		19°C
(67°F)		14°C
(58°F)		8°C
(46°F)		1°C
(35°F)
Average low-3°C
(27°F)		-3°C
(27°F)		0°C
(33°F)		4°C
(39°F)		8°C
(48°F)		13°C
(55°F)		18°C
(64°F)		20°C
(68°F)		18°C
(64°F)		13°C
(55°F)		6°C
(43°F)		-0°C
(31°F)
Mean minimum-8°C
(17°F)		-8°C
(18°F)		-3°C
(26°F)		1°C
(34°F)		6°C
(42°F)		10°C
(50°F)		15°C
(59°F)		17°C
(63°F)		14°C
(58°F)		8°C
(46°F)		0°C
(33°F)		-6°C
(22°F)
Minimum-9°C
(16°F)		-10°C
(14°F)		-5°C
(23°F)		-0°C
(32°F)		5°C
(41°F)		9°C
(48°F)		13°C
(55°F)		16°C
(61°F)		13°C
(56°F)		6°C
(43°F)		-3°C
(28°F)		-6°C
(21°F)

Compare climate in Muroran with other places

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

Monthly average precipitation in Muroran, Japan

Muroran usually has the most precipitation in July, August and September, with an average of 14 rainy days and 153 mm (6.0 inches) of precipitation per month. The driest months in Muroran are January, February and March. On average, 68 mm (2.7 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Muroran. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)66 (2.6)59 (2.3)81 (3.2)86 (3.4)99 (3.9)126 (5.0)128 (5.0)194 (7.7)137 (5.4)127 (5.0)95 (3.8)86 (3.4)
Average precipitation days (≥ 1 mm)13139111011141513121321

Monthly sunshine hours in Muroran, Japan

The sunniest months in Muroran are May, June and July, when the sun shines an average of 9 hours 42 minutes a day. Least sunny months in Muroran: January, November and December receive an average of 5 hours 22 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Muroran. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours142194252284299294298276264234182169
Mean daily daylight hours9h 27m10h 32m11h 56m13h 22m14h 35m15h 12m14h 53m13h 49m12h 27m11h 2m9h 46m9h 7m

Solar UV radiation in Muroran, Japan

Muroran experiences the highest level of ultraviolet (UV) radiation in May, June and August, when the maximum UV index can reach values of 9 - 10, which corresponds to the Very High 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 3. For more detailed information, check out our hourly Muroran UV Index data.

Average daily maximum UV levels by month for Muroran. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)23579109108632