nomadseason

Monthly climate in Otaru, Japan

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Otaru features a humid continental climate (Dfb). Temperatures typically range between -4 °C (25 °F) and 21 °C (70 °F) through the year, but rarely can drop to -13 °C (8 °F) or can rise to as high as 29 °C (85 °F). The average annual precipitation amounts to about 1412 mm (55.6 inches) and receives 200 rainy days on the 1 mm (0.04 inches) threshold annually. Otaru enjoys an average of 2910 hours of sunshine throughout the year, and daylight varies from 9 hours 1 minutes to 15 hours 18 minutes per day.

Monthly average temperatures in Otaru, Japan

The warmest months in Otaru are July, August and September, with daily mean temperatures ranging from 18 to 21 °C (65 - 70 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -4 to -2 °C (25 - 29 °F) throughout the day. On average each year, Otaru experiences 8 days above 25 °C (77.0 °F) and 112 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Otaru. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum4°C
(40°F)		6°C
(44°F)		12°C
(54°F)		17°C
(63°F)		26°C
(80°F)		24°C
(75°F)		28°C
(82°F)		29°C
(85°F)		26°C
(80°F)		22°C
(71°F)		15°C
(59°F)		11°C
(52°F)
Mean maximum3°C
(37°F)		5°C
(41°F)		9°C
(48°F)		13°C
(56°F)		20°C
(68°F)		20°C
(69°F)		26°C
(79°F)		27°C
(81°F)		24°C
(76°F)		20°C
(68°F)		15°C
(58°F)		8°C
(46°F)
Average high-2°C
(28°F)		-2°C
(29°F)		3°C
(38°F)		7°C
(45°F)		13°C
(56°F)		17°C
(62°F)		22°C
(71°F)		23°C
(74°F)		20°C
(68°F)		14°C
(58°F)		7°C
(46°F)		0°C
(32°F)
Daily mean-4°C
(25°F)		-3°C
(26°F)		1°C
(34°F)		5°C
(40°F)		11°C
(51°F)		14°C
(58°F)		20°C
(68°F)		21°C
(70°F)		18°C
(65°F)		12°C
(54°F)		5°C
(42°F)		-2°C
(29°F)
Average low-6°C
(22°F)		-5°C
(23°F)		-1°C
(30°F)		2°C
(36°F)		8°C
(47°F)		12°C
(54°F)		18°C
(64°F)		19°C
(67°F)		16°C
(61°F)		10°C
(51°F)		4°C
(39°F)		-3°C
(26°F)
Mean minimum-11°C
(12°F)		-10°C
(13°F)		-6°C
(21°F)		-2°C
(28°F)		5°C
(41°F)		8°C
(47°F)		14°C
(57°F)		15°C
(59°F)		12°C
(54°F)		5°C
(41°F)		-2°C
(28°F)		-8°C
(17°F)
Minimum-12°C
(10°F)		-13°C
(8°F)		-7°C
(19°F)		-3°C
(26°F)		3°C
(38°F)		6°C
(44°F)		9°C
(49°F)		14°C
(58°F)		10°C
(50°F)		4°C
(39°F)		-5°C
(23°F)		-10°C
(15°F)

Compare climate in Otaru with other places

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

Monthly average precipitation in Otaru, Japan

Otaru usually has the most precipitation in August, October and November, with an average of 17 rainy days and 163 mm (6.4 inches) of precipitation per month. The driest months in Otaru are January, April and May. On average, 85 mm (3.3 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Otaru. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)87 (3.4)99 (3.9)95 (3.7)76 (3.0)90 (3.6)112 (4.4)101 (4.0)169 (6.7)117 (4.6)152 (6.0)167 (6.6)147 (5.8)
Average precipitation days (≥ 1 mm)202216111312121414172227

Monthly sunshine hours in Otaru, Japan

The sunniest months in Otaru are May, June and July, when the sun shines an average of 10 hours 3 minutes a day. Least sunny months in Otaru: January, November and December receive an average of 5 hours 4 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Otaru. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours127186242287309295320294272235177162
Mean daily daylight hours9h 22m10h 30m11h 56m13h 24m14h 40m15h 18m14h 59m13h 52m12h 28m11h 0m9h 42m9h 1m

Solar UV radiation in Otaru, Japan

Otaru experiences the highest level of ultraviolet (UV) radiation in May, July 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 Otaru UV Index data.

Average daily maximum UV levels by month for Otaru. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)2357999108532