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Monthly climate in Hachijo, Japan

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Hachijo features a humid subtropical climate (Cfa). Temperatures typically range between 13 °C (56 °F) and 28 °C (82 °F) through the year, but rarely can drop to 6 °C (44 °F) or can rise to as high as 30 °C (87 °F). The average annual precipitation amounts to about 2286 mm (90.0 inches) and receives 183 rainy days on the 1 mm (0.04 inches) threshold annually. Hachijo enjoys an average of 3006 hours of sunshine throughout the year, and daylight varies from 9 hours 59 minutes to 14 hours 17 minutes per day.

Monthly average temperatures in Hachijo, Japan

The warmest months in Hachijo are July, August and September, with daily mean temperatures ranging from 26 to 28 °C (80 - 82 °F) throughout the day. The coldest temperatures usually occur in January, February and March, when daily mean temperatures range from 13 to 15 °C (56 - 60 °F) throughout the day. On average each year, Hachijo experiences 91 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 Hachijo. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum20°C
(69°F)		21°C
(70°F)		21°C
(70°F)		23°C
(73°F)		25°C
(78°F)		26°C
(80°F)		30°C
(86°F)		30°C
(87°F)		30°C
(86°F)		28°C
(83°F)		24°C
(76°F)		23°C
(74°F)
Mean maximum19°C
(67°F)		19°C
(67°F)		20°C
(68°F)		21°C
(71°F)		24°C
(75°F)		25°C
(78°F)		28°C
(83°F)		29°C
(85°F)		29°C
(84°F)		27°C
(81°F)		24°C
(75°F)		22°C
(71°F)
Average high15°C
(59°F)		15°C
(58°F)		17°C
(62°F)		19°C
(66°F)		22°C
(71°F)		24°C
(76°F)		27°C
(81°F)		28°C
(83°F)		27°C
(82°F)		24°C
(76°F)		21°C
(70°F)		17°C
(63°F)
Daily mean13°C
(56°F)		13°C
(56°F)		15°C
(60°F)		18°C
(64°F)		21°C
(70°F)		23°C
(74°F)		26°C
(80°F)		28°C
(82°F)		27°C
(80°F)		24°C
(75°F)		20°C
(68°F)		16°C
(61°F)
Average low12°C
(54°F)		12°C
(53°F)		14°C
(58°F)		17°C
(62°F)		20°C
(68°F)		23°C
(73°F)		26°C
(79°F)		27°C
(81°F)		26°C
(79°F)		23°C
(73°F)		19°C
(66°F)		15°C
(59°F)
Mean minimum8°C
(46°F)		8°C
(47°F)		10°C
(51°F)		12°C
(55°F)		17°C
(62°F)		20°C
(68°F)		24°C
(75°F)		25°C
(78°F)		23°C
(74°F)		19°C
(67°F)		15°C
(59°F)		10°C
(51°F)
Minimum6°C
(44°F)		7°C
(45°F)		10°C
(49°F)		11°C
(51°F)		16°C
(61°F)		18°C
(64°F)		23°C
(74°F)		25°C
(77°F)		22°C
(73°F)		18°C
(64°F)		13°C
(56°F)		8°C
(47°F)

Compare climate in Hachijo with other places

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

Monthly average precipitation in Hachijo, Japan

Hachijo usually has the most precipitation in June, September and October, with an average of 18 rainy days and 328 mm (12.9 inches) of precipitation per month. The driest months in Hachijo are January, February and August. On average, 109 mm (4.3 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Hachijo. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)130 (5.1)114 (4.5)201 (7.9)133 (5.2)184 (7.3)338 (13.3)170 (6.7)83 (3.3)311 (12.3)334 (13.1)154 (6.1)133 (5.2)
Average precipitation days (≥ 1 mm)161517121217121019191717

Monthly sunshine hours in Hachijo, Japan

The sunniest months in Hachijo are May, July and August, when the sun shines an average of 9 hours 51 minutes a day. Least sunny months in Hachijo: January, February 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 Hachijo. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours169219257268284246298333267221230208
Mean daily daylight hours10h 13m10h 59m11h 58m12h 59m13h 51m14h 17m14h 4m13h 19m12h 21m11h 19m10h 26m9h 59m

Solar UV radiation in Hachijo, Japan

Hachijo experiences the highest level of ultraviolet (UV) radiation in April, June and July, 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 Hachijo UV Index data.

Average daily maximum UV levels by month for Hachijo. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)469111112121110764