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Monthly climate in Tomakomai, Japan

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Tomakomai features a humid continental climate (Dfb). Temperatures typically range between -4 °C (25 °F) and 20 °C (69 °F) through the year, but rarely can drop to -14 °C (7 °F) or can rise to as high as 28 °C (83 °F). The average annual precipitation amounts to about 1280 mm (50.4 inches) and receives 148 rainy days on the 1 mm (0.04 inches) threshold annually. Tomakomai enjoys an average of 2936 hours of sunshine throughout the year, and daylight varies from 9 hours 5 minutes to 15 hours 14 minutes per day.

Monthly average temperatures in Tomakomai, Japan

The warmest months in Tomakomai are July, August and September, with daily mean temperatures ranging from 18 to 20 °C (64 - 69 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -4 to -1 °C (25 - 30 °F) throughout the day. On average each year, Tomakomai experiences 8 days above 25 °C (77.0 °F) and 111 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Tomakomai. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum6°C
(44°F)		6°C
(43°F)		11°C
(53°F)		17°C
(62°F)		23°C
(73°F)		24°C
(75°F)		28°C
(83°F)		28°C
(83°F)		26°C
(80°F)		23°C
(74°F)		16°C
(62°F)		12°C
(55°F)
Mean maximum4°C
(39°F)		5°C
(41°F)		9°C
(48°F)		13°C
(56°F)		20°C
(68°F)		19°C
(67°F)		26°C
(79°F)		27°C
(81°F)		24°C
(76°F)		21°C
(70°F)		15°C
(60°F)		9°C
(49°F)
Average high-2°C
(29°F)		-1°C
(30°F)		4°C
(39°F)		8°C
(47°F)		13°C
(56°F)		17°C
(62°F)		21°C
(70°F)		22°C
(73°F)		20°C
(69°F)		15°C
(59°F)		8°C
(47°F)		1°C
(34°F)
Daily mean-4°C
(25°F)		-4°C
(26°F)		1°C
(34°F)		5°C
(42°F)		11°C
(51°F)		14°C
(58°F)		19°C
(66°F)		20°C
(69°F)		18°C
(64°F)		12°C
(54°F)		6°C
(42°F)		-1°C
(30°F)
Average low-7°C
(20°F)		-6°C
(21°F)		-2°C
(29°F)		2°C
(36°F)		8°C
(46°F)		12°C
(54°F)		17°C
(62°F)		18°C
(65°F)		15°C
(59°F)		9°C
(49°F)		3°C
(38°F)		-4°C
(26°F)
Mean minimum-12°C
(10°F)		-12°C
(11°F)		-8°C
(19°F)		-2°C
(28°F)		4°C
(40°F)		8°C
(47°F)		13°C
(56°F)		14°C
(57°F)		10°C
(51°F)		4°C
(39°F)		-3°C
(27°F)		-9°C
(16°F)
Minimum-14°C
(8°F)		-14°C
(7°F)		-9°C
(16°F)		-4°C
(24°F)		4°C
(39°F)		6°C
(44°F)		10°C
(50°F)		13°C
(55°F)		8°C
(47°F)		3°C
(38°F)		-6°C
(21°F)		-10°C
(13°F)

Compare climate in Tomakomai with other places

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

Monthly average precipitation in Tomakomai, Japan

Tomakomai usually has the most precipitation in August, September and October, with an average of 14 rainy days and 164 mm (6.5 inches) of precipitation per month. The driest months in Tomakomai are January, February and December. On average, 55 mm (2.2 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Tomakomai. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)49 (1.9)53 (2.1)89 (3.5)93 (3.7)90 (3.6)128 (5.1)121 (4.7)206 (8.1)145 (5.7)143 (5.6)102 (4.0)62 (2.4)
Average precipitation days (≥ 1 mm)91012131112141515141211

Monthly sunshine hours in Tomakomai, Japan

The sunniest months in Tomakomai are May, June and July, when the sun shines an average of 9 hours 59 minutes a day. Least sunny months in Tomakomai: January, November and December receive an average of 5 hours 25 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Tomakomai. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours145197250285305302311287266231181171
Mean daily daylight hours9h 25m10h 31m11h 56m13h 23m14h 37m15h 14m14h 55m13h 50m12h 27m11h 1m9h 45m9h 5m

Solar UV radiation in Tomakomai, Japan

Tomakomai experiences the highest level of ultraviolet (UV) radiation in June, 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 Tomakomai UV Index data.

Average daily maximum UV levels by month for Tomakomai. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)23578109108532