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Monthly climate in Iheya, Japan

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Iheya features a humid subtropical climate (Cfa). Temperatures typically range between 18 °C (64 °F) and 28 °C (83 °F) through the year, but rarely can drop to 11 °C (52 °F) or can rise to as high as 30 °C (87 °F). The average annual precipitation amounts to about 2005 mm (78.9 inches) and receives 168 rainy days on the 1 mm (0.04 inches) threshold annually. Iheya enjoys an average of 3042 hours of sunshine throughout the year, and daylight varies from 10 hours 27 minutes to 13 hours 47 minutes per day.

Monthly average temperatures in Iheya, Japan

The warmest months in Iheya are July, August and September, with daily mean temperatures ranging from 28 to 28 °C (82 - 83 °F) throughout the day. The coldest temperatures usually occur in January, February and March, when daily mean temperatures range from 18 to 19 °C (64 - 67 °F) throughout the day. On average each year, Iheya experiences 131 days above 25 °C (77.0 °F) and 0 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Iheya. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum23°C
(74°F)		24°C
(75°F)		24°C
(75°F)		25°C
(78°F)		27°C
(81°F)		28°C
(83°F)		30°C
(87°F)		30°C
(87°F)		30°C
(86°F)		29°C
(84°F)		26°C
(80°F)		25°C
(77°F)
Mean maximum23°C
(73°F)		22°C
(72°F)		23°C
(73°F)		24°C
(76°F)		26°C
(79°F)		28°C
(82°F)		29°C
(85°F)		30°C
(85°F)		29°C
(85°F)		28°C
(83°F)		26°C
(78°F)		24°C
(75°F)
Average high19°C
(66°F)		19°C
(66°F)		20°C
(69°F)		22°C
(71°F)		24°C
(76°F)		27°C
(80°F)		28°C
(83°F)		29°C
(84°F)		28°C
(83°F)		26°C
(79°F)		24°C
(75°F)		21°C
(69°F)
Daily mean18°C
(64°F)		18°C
(64°F)		19°C
(67°F)		21°C
(70°F)		24°C
(75°F)		26°C
(79°F)		28°C
(83°F)		28°C
(83°F)		28°C
(82°F)		26°C
(78°F)		23°C
(73°F)		20°C
(67°F)
Average low17°C
(63°F)		17°C
(62°F)		18°C
(66°F)		20°C
(68°F)		23°C
(73°F)		25°C
(78°F)		27°C
(82°F)		28°C
(82°F)		27°C
(81°F)		25°C
(77°F)		22°C
(72°F)		19°C
(66°F)
Mean minimum13°C
(56°F)		13°C
(55°F)		15°C
(59°F)		16°C
(61°F)		20°C
(68°F)		23°C
(73°F)		26°C
(79°F)		26°C
(80°F)		25°C
(78°F)		22°C
(71°F)		19°C
(66°F)		15°C
(59°F)
Minimum11°C
(53°F)		11°C
(52°F)		13°C
(56°F)		15°C
(59°F)		19°C
(66°F)		22°C
(72°F)		26°C
(78°F)		25°C
(77°F)		24°C
(76°F)		21°C
(70°F)		18°C
(65°F)		13°C
(56°F)

Compare climate in Iheya with other places

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

Monthly average precipitation in Iheya, Japan

Iheya usually has the most precipitation in May, June and September, with an average of 17 rainy days and 270 mm (10.6 inches) of precipitation per month. The driest months in Iheya are January, February and November. On average, 106 mm (4.2 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Iheya. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)103 (4.1)108 (4.3)132 (5.2)135 (5.3)214 (8.4)392 (15.4)173 (6.8)161 (6.3)204 (8.0)135 (5.3)107 (4.2)141 (5.5)
Average precipitation days (≥ 1 mm)121313121320121520121016

Monthly sunshine hours in Iheya, Japan

The sunniest months in Iheya are May, July and August, when the sun shines an average of 10 hours 0 minutes a day. Least sunny months in Iheya: January, February and December receive an average of 5 hours 51 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Iheya. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours148193261262297263314318292270228191
Mean daily daylight hours10h 38m11h 13m12h 0m12h 47m13h 28m13h 47m13h 38m13h 3m12h 17m11h 29m10h 48m10h 27m

Solar UV radiation in Iheya, Japan

Iheya experiences the highest level of ultraviolet (UV) radiation in May, July and August, when the maximum UV index can reach values of 13 - 13, which corresponds to the Extreme category of sun exposure. January, February and December are in the High / Very High exposure category. In these months, the maximum values of the UV index do not exceed 8. For more detailed information, check out our hourly Iheya UV Index data.

Average daily maximum UV levels by month for Iheya. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)7811121313131312986