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Monthly climate in Aya, Japan

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Aya features a humid subtropical climate (Cfa). Temperatures typically range between 6 °C (44 °F) and 27 °C (81 °F) through the year, but rarely can drop to -5 °C (24 °F) or can rise to as high as 35 °C (95 °F). The average annual precipitation amounts to about 2334 mm (91.9 inches) and receives 153 rainy days on the 1 mm (0.04 inches) threshold annually. Aya enjoys an average of 2996 hours of sunshine throughout the year, and daylight varies from 10 hours 4 minutes to 14 hours 11 minutes per day.

Monthly average temperatures in Aya, Japan

The warmest months in Aya are July, August and September, with daily mean temperatures ranging from 24 to 27 °C (76 - 81 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 6 to 8 °C (44 - 47 °F) throughout the day. On average each year, Aya experiences 101 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 Aya. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum21°C
(70°F)		21°C
(70°F)		25°C
(78°F)		26°C
(79°F)		29°C
(85°F)		31°C
(89°F)		34°C
(94°F)		35°C
(95°F)		32°C
(91°F)		31°C
(87°F)		23°C
(74°F)		22°C
(72°F)
Mean maximum18°C
(64°F)		19°C
(66°F)		23°C
(74°F)		24°C
(76°F)		28°C
(83°F)		30°C
(85°F)		33°C
(91°F)		33°C
(92°F)		32°C
(90°F)		29°C
(84°F)		23°C
(73°F)		18°C
(65°F)
Average high11°C
(53°F)		12°C
(54°F)		16°C
(62°F)		20°C
(68°F)		23°C
(74°F)		25°C
(78°F)		29°C
(84°F)		30°C
(87°F)		27°C
(82°F)		23°C
(75°F)		18°C
(65°F)		13°C
(55°F)
Daily mean6°C
(44°F)		8°C
(46°F)		12°C
(53°F)		15°C
(60°F)		19°C
(67°F)		22°C
(72°F)		26°C
(79°F)		27°C
(81°F)		24°C
(76°F)		19°C
(67°F)		14°C
(57°F)		8°C
(47°F)
Average low2°C
(36°F)		3°C
(38°F)		7°C
(45°F)		11°C
(52°F)		15°C
(60°F)		19°C
(67°F)		23°C
(74°F)		24°C
(76°F)		21°C
(71°F)		16°C
(61°F)		9°C
(48°F)		4°C
(39°F)
Mean minimum-3°C
(27°F)		-2°C
(29°F)		1°C
(34°F)		3°C
(38°F)		9°C
(48°F)		16°C
(60°F)		21°C
(70°F)		22°C
(72°F)		16°C
(62°F)		8°C
(48°F)		2°C
(36°F)		-2°C
(29°F)
Minimum-5°C
(24°F)		-3°C
(27°F)		0°C
(33°F)		2°C
(36°F)		6°C
(43°F)		14°C
(57°F)		18°C
(64°F)		21°C
(70°F)		14°C
(57°F)		6°C
(44°F)		-0°C
(32°F)		-2°C
(28°F)

Compare climate in Aya with other places

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

Monthly average precipitation in Aya, Japan

Aya usually has the most precipitation in June, July and September, with an average of 20 rainy days and 342 mm (13.5 inches) of precipitation per month. The driest months in Aya are January, November and December. On average, 71 mm (2.8 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Aya. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)55 (2.2)101 (4.0)176 (6.9)141 (5.6)225 (8.9)321 (12.6)388 (15.3)247 (9.7)319 (12.5)202 (8.0)87 (3.4)71 (2.8)
Average precipitation days (≥ 1 mm)59121012192218191287

Monthly sunshine hours in Aya, Japan

The sunniest months in Aya are March, April and August, when the sun shines an average of 9 hours 9 minutes a day. Least sunny months in Aya: January, February and December receive an average of 7 hours 18 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Aya. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours197233267281264235255294243255234233
Mean daily daylight hours10h 18m11h 1m11h 58m12h 57m13h 47m14h 11m13h 59m13h 16m12h 20m11h 21m10h 31m10h 4m

Solar UV radiation in Aya, Japan

Aya 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 Aya UV Index data.

Average daily maximum UV levels by month for Aya. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)5610101212131311864