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Monthly climate in Osaki, Japan

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Osaki features a humid subtropical climate (Cfa). Temperatures typically range between 8 °C (46 °F) and 28 °C (82 °F) through the year, but rarely can drop to -4 °C (26 °F) or can rise to as high as 35 °C (96 °F). The average annual precipitation amounts to about 2380 mm (93.7 inches) and receives 163 rainy days on the 1 mm (0.04 inches) threshold annually. Osaki enjoys an average of 3116 hours of sunshine throughout the year, and daylight varies from 10 hours 7 minutes to 14 hours 9 minutes per day.

Monthly average temperatures in Osaki, Japan

The warmest months in Osaki are July, August and September, with daily mean temperatures ranging from 25 to 28 °C (78 - 82 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 8 to 10 °C (46 - 50 °F) throughout the day. On average each year, Osaki experiences 114 days above 25 °C (77.0 °F) and 9 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Osaki. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum22°C
(71°F)		22°C
(72°F)		25°C
(77°F)		27°C
(81°F)		30°C
(86°F)		31°C
(88°F)		34°C
(94°F)		35°C
(96°F)		33°C
(91°F)		31°C
(88°F)		26°C
(79°F)		23°C
(74°F)
Mean maximum19°C
(66°F)		19°C
(67°F)		23°C
(74°F)		26°C
(78°F)		29°C
(84°F)		30°C
(86°F)		33°C
(93°F)		34°C
(93°F)		32°C
(90°F)		30°C
(86°F)		24°C
(76°F)		20°C
(67°F)
Average high12°C
(55°F)		13°C
(56°F)		17°C
(63°F)		21°C
(70°F)		24°C
(76°F)		26°C
(79°F)		30°C
(86°F)		31°C
(88°F)		29°C
(84°F)		25°C
(77°F)		19°C
(67°F)		14°C
(57°F)
Daily mean8°C
(46°F)		9°C
(48°F)		13°C
(55°F)		16°C
(62°F)		20°C
(69°F)		23°C
(74°F)		27°C
(80°F)		28°C
(82°F)		25°C
(78°F)		21°C
(70°F)		15°C
(59°F)		10°C
(50°F)
Average low4°C
(39°F)		5°C
(41°F)		9°C
(48°F)		12°C
(54°F)		16°C
(62°F)		20°C
(69°F)		24°C
(76°F)		25°C
(77°F)		23°C
(73°F)		18°C
(64°F)		11°C
(52°F)		6°C
(43°F)
Mean minimum-2°C
(29°F)		-1°C
(31°F)		2°C
(37°F)		6°C
(42°F)		10°C
(50°F)		17°C
(62°F)		22°C
(72°F)		23°C
(74°F)		18°C
(65°F)		11°C
(51°F)		4°C
(40°F)		-1°C
(31°F)
Minimum-4°C
(26°F)		-2°C
(29°F)		1°C
(34°F)		4°C
(40°F)		7°C
(46°F)		15°C
(59°F)		19°C
(66°F)		22°C
(73°F)		16°C
(61°F)		9°C
(48°F)		3°C
(37°F)		-1°C
(30°F)

Compare climate in Osaki with other places

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

Monthly average precipitation in Osaki, Japan

Osaki usually has the most precipitation in June, July and September, with an average of 21 rainy days and 358 mm (14.1 inches) of precipitation per month. The driest months in Osaki are January, November and December. On average, 77 mm (3.0 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Osaki. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)55 (2.2)105 (4.2)178 (7.0)142 (5.6)251 (9.9)408 (16.0)378 (14.9)229 (9.0)289 (11.4)170 (6.7)95 (3.8)79 (3.1)
Average precipitation days (≥ 1 mm)69131013202520201287

Monthly sunshine hours in Osaki, Japan

The sunniest months in Osaki are April, July and August, when the sun shines an average of 9 hours 33 minutes a day. Least sunny months in Osaki: January, February and December receive an average of 7 hours 16 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Osaki. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours196234268288279248279311269262244232
Mean daily daylight hours10h 20m11h 3m11h 59m12h 56m13h 44m14h 9m13h 56m13h 14m12h 19m11h 22m10h 32m10h 7m

Solar UV radiation in Osaki, Japan

Osaki experiences the highest level of ultraviolet (UV) radiation in May, July and August, when the maximum UV index can reach values of 12 - 13, which corresponds to the Extreme category of sun exposure. January, February and December are in the Moderate / High exposure category. In these months, the maximum values of the UV index do not exceed 6. For more detailed information, check out our hourly Osaki UV Index data.

Average daily maximum UV levels by month for Osaki. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)5610101212121311865