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Monthly climate in Ashiya, Japan

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Ashiya features a humid subtropical climate (Cfa). Temperatures typically range between 6 °C (43 °F) and 29 °C (84 °F) through the year, but rarely can drop to -2 °C (28 °F) or can rise to as high as 37 °C (98 °F). The average annual precipitation amounts to about 1720 mm (67.7 inches) and receives 125 rainy days on the 1 mm (0.04 inches) threshold annually. Ashiya enjoys an average of 3015 hours of sunshine throughout the year, and daylight varies from 9 hours 51 minutes to 14 hours 26 minutes per day.

Monthly average temperatures in Ashiya, Japan

The warmest months in Ashiya are July, August and September, with daily mean temperatures ranging from 25 to 29 °C (77 - 84 °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 - 48 °F) throughout the day. On average each year, Ashiya experiences 108 days above 25 °C (77.0 °F) and 3 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Ashiya. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum16°C
(61°F)		18°C
(65°F)		21°C
(71°F)		25°C
(77°F)		30°C
(86°F)		31°C
(88°F)		36°C
(97°F)		37°C
(98°F)		35°C
(96°F)		31°C
(87°F)		24°C
(75°F)		20°C
(68°F)
Mean maximum13°C
(57°F)		15°C
(59°F)		20°C
(67°F)		24°C
(75°F)		28°C
(83°F)		30°C
(85°F)		34°C
(94°F)		36°C
(96°F)		33°C
(91°F)		29°C
(84°F)		22°C
(73°F)		17°C
(63°F)
Average high9°C
(48°F)		10°C
(49°F)		14°C
(57°F)		18°C
(65°F)		23°C
(74°F)		26°C
(80°F)		30°C
(86°F)		32°C
(90°F)		28°C
(83°F)		23°C
(73°F)		17°C
(64°F)		11°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
(84°F)		25°C
(77°F)		20°C
(68°F)		14°C
(57°F)		8°C
(48°F)
Average low3°C
(38°F)		3°C
(38°F)		7°C
(44°F)		11°C
(52°F)		16°C
(62°F)		20°C
(69°F)		25°C
(77°F)		26°C
(80°F)		22°C
(73°F)		17°C
(62°F)		10°C
(51°F)		6°C
(42°F)
Mean minimum-0°C
(32°F)		-1°C
(31°F)		2°C
(35°F)		5°C
(41°F)		11°C
(51°F)		16°C
(62°F)		22°C
(72°F)		23°C
(73°F)		17°C
(63°F)		11°C
(52°F)		5°C
(42°F)		2°C
(35°F)
Minimum-2°C
(29°F)		-2°C
(28°F)		1°C
(34°F)		4°C
(39°F)		10°C
(50°F)		15°C
(58°F)		21°C
(69°F)		20°C
(68°F)		15°C
(59°F)		10°C
(50°F)		4°C
(40°F)		0°C
(32°F)

Compare climate in Ashiya with other places

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

Monthly average precipitation in Ashiya, Japan

Ashiya usually has the most precipitation in July, August and October, with an average of 15 rainy days and 254 mm (10.0 inches) of precipitation per month. The driest months in Ashiya are January, February and November. On average, 50 mm (2.0 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Ashiya. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)45 (1.8)57 (2.3)109 (4.3)137 (5.4)154 (6.0)153 (6.0)317 (12.5)210 (8.3)197 (7.8)235 (9.2)47 (1.9)60 (2.3)
Average precipitation days (≥ 1 mm)5610910132014141266

Monthly sunshine hours in Ashiya, Japan

The sunniest months in Ashiya are April, May and August, when the sun shines an average of 9 hours 32 minutes a day. Least sunny months in Ashiya: January, February and December receive an average of 6 hours 51 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Ashiya. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours181224262278292271263307244237234216
Mean daily daylight hours10h 5m10h 54m11h 58m13h 3m13h 58m14h 26m14h 12m13h 24m12h 21m11h 16m10h 20m9h 51m

Solar UV radiation in Ashiya, Japan

Ashiya experiences the highest level of ultraviolet (UV) radiation in April, May 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 Ashiya UV Index data.

Average daily maximum UV levels by month for Ashiya. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)468111111111110753