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Monthly climate in Saku, Japan

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Saku features a humid continental climate (Dfb). Temperatures typically range between 0 °C (31 °F) and 23 °C (75 °F) through the year, but rarely can drop to -11 °C (12 °F) or can rise to as high as 34 °C (94 °F). The average annual precipitation amounts to about 1645 mm (64.8 inches) and receives 175 rainy days on the 1 mm (0.04 inches) threshold annually. Saku enjoys an average of 2905 hours of sunshine throughout the year, and daylight varies from 9 hours 43 minutes to 14 hours 34 minutes per day.

Monthly average temperatures in Saku, Japan

The warmest months in Saku are July, August and September, with daily mean temperatures ranging from 19 to 23 °C (66 - 75 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 0 to 2 °C (31 - 36 °F) throughout the day. On average each year, Saku experiences 54 days above 25 °C (77.0 °F) and 101 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Saku. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum11°C
(51°F)		17°C
(64°F)		21°C
(71°F)		27°C
(81°F)		30°C
(87°F)		29°C
(85°F)		33°C
(92°F)		34°C
(94°F)		29°C
(85°F)		26°C
(79°F)		20°C
(68°F)		19°C
(66°F)
Mean maximum9°C
(49°F)		13°C
(56°F)		19°C
(66°F)		23°C
(74°F)		28°C
(83°F)		26°C
(79°F)		30°C
(87°F)		32°C
(90°F)		28°C
(82°F)		25°C
(78°F)		18°C
(65°F)		13°C
(56°F)
Average high4°C
(39°F)		5°C
(42°F)		10°C
(51°F)		15°C
(59°F)		20°C
(69°F)		23°C
(73°F)		26°C
(79°F)		28°C
(83°F)		23°C
(74°F)		17°C
(63°F)		12°C
(55°F)		7°C
(44°F)
Daily mean-0°C
(31°F)		1°C
(33°F)		5°C
(41°F)		9°C
(49°F)		15°C
(59°F)		18°C
(65°F)		22°C
(72°F)		23°C
(75°F)		19°C
(66°F)		13°C
(56°F)		7°C
(45°F)		2°C
(36°F)
Average low-4°C
(26°F)		-3°C
(27°F)		0°C
(32°F)		4°C
(40°F)		10°C
(50°F)		14°C
(57°F)		19°C
(66°F)		20°C
(68°F)		15°C
(60°F)		9°C
(49°F)		3°C
(37°F)		-2°C
(29°F)
Mean minimum-8°C
(18°F)		-8°C
(18°F)		-5°C
(24°F)		-2°C
(28°F)		2°C
(37°F)		10°C
(50°F)		15°C
(60°F)		16°C
(60°F)		10°C
(51°F)		3°C
(38°F)		-3°C
(28°F)		-5°C
(23°F)
Minimum-11°C
(12°F)		-10°C
(15°F)		-6°C
(22°F)		-4°C
(26°F)		1°C
(33°F)		8°C
(46°F)		14°C
(58°F)		12°C
(53°F)		8°C
(47°F)		2°C
(36°F)		-3°C
(26°F)		-7°C
(19°F)

Compare climate in Saku with other places

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

Monthly average precipitation in Saku, Japan

Saku usually has the most precipitation in June, July and October, with an average of 21 rainy days and 244 mm (9.6 inches) of precipitation per month. The driest months in Saku are January, February and November. On average, 45 mm (1.8 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Saku. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)48 (1.9)49 (1.9)106 (4.2)105 (4.1)142 (5.6)193 (7.6)287 (11.3)190 (7.5)185 (7.3)253 (9.9)38 (1.5)50 (2.0)
Average precipitation days (≥ 1 mm)88111217202622201768

Monthly sunshine hours in Saku, Japan

The sunniest months in Saku are April, May and August, when the sun shines an average of 9 hours 10 minutes a day. Least sunny months in Saku: 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 Saku. 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 58m10h 50m11h 57m13h 7m14h 5m14h 34m14h 20m13h 29m12h 22m11h 14m10h 14m9h 43m

Solar UV radiation in Saku, Japan

Saku 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 Saku UV Index data.

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