nomadseason

Monthly climate in Shimonoseki, Japan

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Shimonoseki features a humid subtropical climate (Cfa). Temperatures typically range between 8 °C (46 °F) and 27 °C (81 °F) through the year, but rarely can drop to -1 °C (30 °F) or can rise to as high as 32 °C (89 °F). The average annual precipitation amounts to about 1841 mm (72.5 inches) and receives 138 rainy days on the 1 mm (0.04 inches) threshold annually. Shimonoseki enjoys an average of 3096 hours of sunshine throughout the year, and daylight varies from 9 hours 54 minutes to 14 hours 22 minutes per day.

Monthly average temperatures in Shimonoseki, Japan

The warmest months in Shimonoseki 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 8 to 10 °C (46 - 50 °F) throughout the day. On average each year, Shimonoseki experiences 68 days above 25 °C (77.0 °F) and 1 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Shimonoseki. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum17°C
(64°F)		18°C
(65°F)		18°C
(64°F)		22°C
(71°F)		25°C
(77°F)		27°C
(81°F)		31°C
(88°F)		32°C
(89°F)		32°C
(89°F)		27°C
(82°F)		23°C
(74°F)		20°C
(68°F)
Mean maximum14°C
(57°F)		15°C
(59°F)		17°C
(63°F)		20°C
(69°F)		24°C
(75°F)		25°C
(77°F)		30°C
(86°F)		31°C
(89°F)		30°C
(85°F)		26°C
(79°F)		21°C
(70°F)		17°C
(63°F)
Average high9°C
(49°F)		10°C
(50°F)		13°C
(56°F)		16°C
(61°F)		20°C
(68°F)		23°C
(74°F)		27°C
(81°F)		29°C
(84°F)		26°C
(79°F)		22°C
(71°F)		17°C
(63°F)		12°C
(53°F)
Daily mean8°C
(46°F)		8°C
(46°F)		11°C
(52°F)		14°C
(58°F)		18°C
(65°F)		21°C
(71°F)		25°C
(78°F)		27°C
(81°F)		24°C
(76°F)		20°C
(68°F)		15°C
(59°F)		10°C
(50°F)
Average low6°C
(43°F)		6°C
(43°F)		9°C
(49°F)		12°C
(54°F)		16°C
(62°F)		20°C
(68°F)		24°C
(76°F)		26°C
(79°F)		23°C
(73°F)		18°C
(65°F)		13°C
(56°F)		8°C
(47°F)
Mean minimum1°C
(35°F)		1°C
(35°F)		5°C
(41°F)		8°C
(46°F)		13°C
(55°F)		17°C
(64°F)		21°C
(70°F)		23°C
(74°F)		19°C
(67°F)		14°C
(57°F)		9°C
(48°F)		3°C
(37°F)
Minimum-1°C
(30°F)		-1°C
(31°F)		4°C
(39°F)		7°C
(45°F)		12°C
(54°F)		16°C
(62°F)		20°C
(69°F)		21°C
(69°F)		18°C
(65°F)		14°C
(57°F)		8°C
(46°F)		1°C
(34°F)

Compare climate in Shimonoseki with other places

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

Monthly average precipitation in Shimonoseki, Japan

Shimonoseki usually has the most precipitation in July, August and September, with an average of 13 rainy days and 258 mm (10.1 inches) of precipitation per month. The driest months in Shimonoseki are January, November and December. On average, 75 mm (3.0 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Shimonoseki. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)84 (3.3)93 (3.6)165 (6.5)129 (5.1)141 (5.5)194 (7.7)295 (11.6)251 (9.9)226 (8.9)121 (4.7)54 (2.1)89 (3.5)
Average precipitation days (≥ 1 mm)12111210101116131211812

Monthly sunshine hours in Shimonoseki, Japan

The sunniest months in Shimonoseki are May, June and August, when the sun shines an average of 9 hours 48 minutes a day. Least sunny months in Shimonoseki: January, February and December receive an average of 6 hours 50 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Shimonoseki. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours178229262279302295286304255253234215
Mean daily daylight hours10h 8m10h 56m11h 58m13h 2m13h 55m14h 22m14h 9m13h 22m12h 21m11h 18m10h 22m9h 54m

Solar UV radiation in Shimonoseki, Japan

Shimonoseki experiences the highest level of ultraviolet (UV) radiation in May, July and August, 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 exposure category. In these months, the maximum values of the UV index do not exceed 5. For more detailed information, check out our hourly Shimonoseki UV Index data.

Average daily maximum UV levels by month for Shimonoseki. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)458101111121210753