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Monthly climate in Iki, Japan

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Iki features a humid subtropical climate (Cfa). Temperatures typically range between 9 °C (49 °F) and 27 °C (82 °F) through the year, but rarely can drop to 0 °C (33 °F) or can rise to as high as 31 °C (88 °F). The average annual precipitation amounts to about 1776 mm (69.9 inches) and receives 129 rainy days on the 1 mm (0.04 inches) threshold annually. Iki enjoys an average of 3133 hours of sunshine throughout the year, and daylight varies from 9 hours 56 minutes to 14 hours 20 minutes per day.

Monthly average temperatures in Iki, Japan

The warmest months in Iki are July, August and September, with daily mean temperatures ranging from 25 to 27 °C (77 - 82 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 9 to 11 °C (49 - 52 °F) throughout the day. On average each year, Iki experiences 63 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 Iki. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum19°C
(66°F)		17°C
(63°F)		18°C
(65°F)		21°C
(69°F)		23°C
(73°F)		25°C
(78°F)		29°C
(85°F)		30°C
(87°F)		31°C
(88°F)		26°C
(80°F)		23°C
(73°F)		21°C
(70°F)
Mean maximum16°C
(60°F)		15°C
(60°F)		17°C
(63°F)		19°C
(67°F)		22°C
(71°F)		24°C
(75°F)		28°C
(83°F)		30°C
(86°F)		29°C
(84°F)		25°C
(78°F)		21°C
(71°F)		18°C
(64°F)
Average high11°C
(51°F)		11°C
(52°F)		14°C
(57°F)		16°C
(61°F)		19°C
(67°F)		22°C
(72°F)		26°C
(79°F)		28°C
(83°F)		26°C
(78°F)		22°C
(71°F)		18°C
(64°F)		13°C
(55°F)
Daily mean9°C
(49°F)		9°C
(49°F)		12°C
(54°F)		15°C
(59°F)		18°C
(65°F)		21°C
(71°F)		25°C
(78°F)		27°C
(82°F)		25°C
(77°F)		21°C
(70°F)		16°C
(62°F)		11°C
(52°F)
Average low8°C
(46°F)		8°C
(46°F)		11°C
(52°F)		14°C
(57°F)		18°C
(64°F)		21°C
(70°F)		25°C
(77°F)		27°C
(80°F)		24°C
(76°F)		20°C
(68°F)		15°C
(60°F)		10°C
(50°F)
Mean minimum3°C
(37°F)		3°C
(37°F)		6°C
(44°F)		10°C
(49°F)		14°C
(58°F)		19°C
(67°F)		22°C
(72°F)		24°C
(76°F)		21°C
(70°F)		15°C
(60°F)		10°C
(50°F)		4°C
(39°F)
Minimum0°C
(33°F)		1°C
(34°F)		5°C
(42°F)		8°C
(47°F)		13°C
(56°F)		19°C
(66°F)		20°C
(69°F)		21°C
(70°F)		20°C
(69°F)		14°C
(58°F)		8°C
(47°F)		2°C
(37°F)

Compare climate in Iki with other places

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

Monthly average precipitation in Iki, Japan

Iki usually has the most precipitation in July, August and September, with an average of 13 rainy days and 269 mm (10.6 inches) of precipitation per month. The driest months in Iki are January, February and November. On average, 67 mm (2.7 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Iki. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)76 (3.0)75 (3.0)141 (5.5)117 (4.6)137 (5.4)181 (7.1)312 (12.3)260 (10.2)235 (9.2)108 (4.2)50 (2.0)84 (3.3)
Average precipitation days (≥ 1 mm)11101191011141215989

Monthly sunshine hours in Iki, Japan

The sunniest months in Iki are May, July and August, when the sun shines an average of 9 hours 42 minutes a day. Least sunny months in Iki: January, February and December receive an average of 6 hours 55 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Iki. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours182231265286299289291310261259239216
Mean daily daylight hours10h 10m10h 57m11h 58m13h 1m13h 54m14h 20m14h 7m13h 21m12h 21m11h 18m10h 24m9h 56m

Solar UV radiation in Iki, Japan

Iki experiences the highest level of ultraviolet (UV) radiation in July, August and September, 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 / 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 Iki UV Index data.

Average daily maximum UV levels by month for Iki. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)468101111121211764