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Monthly climate in Onomichi, Japan

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Onomichi features a humid subtropical climate (Cfa). Temperatures typically range between 6 °C (43 °F) and 29 °C (85 °F) through the year, but rarely can drop to -5 °C (24 °F) or can rise to as high as 38 °C (100 °F). The average annual precipitation amounts to about 1454 mm (57.3 inches) and receives 108 rainy days on the 1 mm (0.04 inches) threshold annually. Onomichi enjoys an average of 3129 hours of sunshine throughout the year, and daylight varies from 9 hours 52 minutes to 14 hours 24 minutes per day.

Monthly average temperatures in Onomichi, Japan

The warmest months in Onomichi are July, August and September, with daily mean temperatures ranging from 25 to 29 °C (77 - 85 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 6 to 8 °C (43 - 46 °F) throughout the day. On average each year, Onomichi experiences 113 days above 25 °C (77.0 °F) and 10 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Onomichi. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum15°C
(59°F)		20°C
(69°F)		23°C
(73°F)		26°C
(79°F)		31°C
(89°F)		32°C
(90°F)		38°C
(100°F)		37°C
(99°F)		35°C
(95°F)		32°C
(89°F)		24°C
(75°F)		20°C
(69°F)
Mean maximum14°C
(58°F)		16°C
(61°F)		21°C
(70°F)		25°C
(77°F)		29°C
(85°F)		30°C
(87°F)		34°C
(94°F)		36°C
(98°F)		34°C
(93°F)		29°C
(85°F)		23°C
(73°F)		17°C
(63°F)
Average high10°C
(50°F)		10°C
(51°F)		15°C
(59°F)		19°C
(67°F)		24°C
(75°F)		27°C
(80°F)		30°C
(86°F)		33°C
(91°F)		28°C
(83°F)		23°C
(74°F)		18°C
(64°F)		12°C
(53°F)
Daily mean6°C
(43°F)		6°C
(44°F)		10°C
(51°F)		15°C
(59°F)		20°C
(68°F)		23°C
(74°F)		27°C
(81°F)		29°C
(85°F)		25°C
(77°F)		19°C
(67°F)		13°C
(56°F)		8°C
(46°F)
Average low2°C
(37°F)		3°C
(37°F)		6°C
(43°F)		10°C
(51°F)		15°C
(60°F)		19°C
(67°F)		24°C
(76°F)		26°C
(79°F)		22°C
(71°F)		16°C
(60°F)		9°C
(48°F)		4°C
(40°F)
Mean minimum-2°C
(29°F)		-1°C
(30°F)		1°C
(34°F)		3°C
(38°F)		9°C
(48°F)		15°C
(60°F)		21°C
(70°F)		22°C
(72°F)		15°C
(60°F)		9°C
(48°F)		2°C
(37°F)		1°C
(33°F)
Minimum-5°C
(24°F)		-3°C
(26°F)		-0°C
(32°F)		2°C
(36°F)		7°C
(46°F)		13°C
(56°F)		19°C
(66°F)		20°C
(68°F)		14°C
(58°F)		8°C
(46°F)		1°C
(35°F)		-0°C
(32°F)

Compare climate in Onomichi with other places

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

Monthly average precipitation in Onomichi, Japan

Onomichi usually has the most precipitation in July, August and September, with an average of 13 rainy days and 218 mm (8.6 inches) of precipitation per month. The driest months in Onomichi are January, November and December. On average, 39 mm (1.5 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Onomichi. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)40 (1.6)54 (2.1)93 (3.7)117 (4.6)107 (4.2)149 (5.9)314 (12.4)166 (6.5)174 (6.9)164 (6.4)31 (1.2)45 (1.8)
Average precipitation days (≥ 1 mm)5698912171112946

Monthly sunshine hours in Onomichi, Japan

The sunniest months in Onomichi are May, June and August, when the sun shines an average of 9 hours 51 minutes a day. Least sunny months in Onomichi: January, February and December receive an average of 6 hours 59 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Onomichi. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours184231267284304292284309260250238221
Mean daily daylight hours10h 7m10h 55m11h 58m13h 2m13h 57m14h 24m14h 10m13h 23m12h 21m11h 17m10h 21m9h 52m

Solar UV radiation in Onomichi, Japan

Onomichi experiences the highest level of ultraviolet (UV) radiation in May, July and August, when the maximum UV index can reach values of 11 - 12, which corresponds to the Extreme category of sun exposure. January, February 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 Onomichi UV Index data.

Average daily maximum UV levels by month for Onomichi. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)458101111121210764