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Monthly climate in Onagawa Cho, Japan

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Onagawa Cho features a humid subtropical climate (Cfa). Temperatures typically range between 3 °C (39 °F) and 24 °C (75 °F) through the year, but rarely can drop to -4 °C (24 °F) or can rise to as high as 29 °C (85 °F). The average annual precipitation amounts to about 1317 mm (51.8 inches) and receives 128 rainy days on the 1 mm (0.04 inches) threshold annually. Onagawa Cho enjoys an average of 2955 hours of sunshine throughout the year, and daylight varies from 9 hours 31 minutes to 14 hours 47 minutes per day.

Monthly average temperatures in Onagawa Cho, Japan

The warmest months in Onagawa Cho are July, August and September, with daily mean temperatures ranging from 21 to 24 °C (71 - 75 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 3 to 6 °C (39 - 43 °F) throughout the day. On average each year, Onagawa Cho experiences 19 days above 25 °C (77.0 °F) and 18 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Onagawa Cho. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum12°C
(54°F)		12°C
(54°F)		16°C
(62°F)		17°C
(63°F)		24°C
(75°F)		24°C
(76°F)		29°C
(85°F)		29°C
(84°F)		28°C
(82°F)		24°C
(76°F)		19°C
(66°F)		16°C
(62°F)
Mean maximum11°C
(51°F)		10°C
(51°F)		13°C
(55°F)		16°C
(60°F)		20°C
(68°F)		21°C
(70°F)		26°C
(79°F)		28°C
(83°F)		26°C
(79°F)		23°C
(73°F)		18°C
(64°F)		15°C
(59°F)
Average high6°C
(42°F)		6°C
(43°F)		8°C
(47°F)		11°C
(52°F)		15°C
(60°F)		18°C
(65°F)		22°C
(72°F)		25°C
(77°F)		23°C
(73°F)		19°C
(66°F)		14°C
(57°F)		8°C
(48°F)
Daily mean3°C
(39°F)		4°C
(39°F)		6°C
(44°F)		9°C
(49°F)		14°C
(57°F)		17°C
(63°F)		21°C
(71°F)		24°C
(75°F)		22°C
(71°F)		17°C
(63°F)		12°C
(53°F)		6°C
(43°F)
Average low2°C
(35°F)		2°C
(35°F)		4°C
(40°F)		8°C
(46°F)		12°C
(54°F)		16°C
(61°F)		20°C
(69°F)		23°C
(74°F)		20°C
(69°F)		16°C
(60°F)		10°C
(50°F)		4°C
(40°F)
Mean minimum-2°C
(28°F)		-2°C
(29°F)		1°C
(34°F)		4°C
(39°F)		8°C
(47°F)		13°C
(57°F)		17°C
(64°F)		20°C
(69°F)		17°C
(63°F)		11°C
(52°F)		4°C
(40°F)		-0°C
(32°F)
Minimum-4°C
(24°F)		-3°C
(27°F)		-2°C
(29°F)		2°C
(36°F)		7°C
(46°F)		12°C
(55°F)		17°C
(62°F)		19°C
(67°F)		15°C
(59°F)		10°C
(50°F)		2°C
(36°F)		-2°C
(29°F)

Compare climate in Onagawa Cho with other places

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

Monthly average precipitation in Onagawa Cho, Japan

Onagawa Cho usually has the most precipitation in July, August and October, with an average of 13 rainy days and 185 mm (7.3 inches) of precipitation per month. The driest months in Onagawa Cho are January, February and November. On average, 44 mm (1.7 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Onagawa Cho. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)47 (1.8)42 (1.6)107 (4.2)114 (4.5)110 (4.3)96 (3.8)173 (6.8)167 (6.6)141 (5.5)214 (8.4)44 (1.7)63 (2.5)
Average precipitation days (≥ 1 mm)88910111015151211712

Monthly sunshine hours in Onagawa Cho, Japan

The sunniest months in Onagawa Cho are April, May and June, when the sun shines an average of 9 hours 26 minutes a day. Least sunny months in Onagawa Cho: 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 Onagawa Cho. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours177231262276296285251265248216225216
Mean daily daylight hours9h 48m10h 44m11h 57m13h 12m14h 15m14h 47m14h 31m13h 35m12h 24m11h 10m10h 4m9h 31m

Solar UV radiation in Onagawa Cho, Japan

Onagawa Cho experiences the highest level of ultraviolet (UV) radiation in May, July and August, when the maximum UV index can reach values of 10 - 11, which corresponds to the Very High / 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 4. For more detailed information, check out our hourly Onagawa Cho UV Index data.

Average daily maximum UV levels by month for Onagawa Cho. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)3468101010119643