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Monthly climate in Soma, Japan

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Soma features a humid subtropical climate (Cfa). Temperatures typically range between 5 °C (40 °F) and 25 °C (77 °F) through the year, but rarely can drop to -3 °C (27 °F) or can rise to as high as 31 °C (88 °F). The average annual precipitation amounts to about 1498 mm (59.0 inches) and receives 136 rainy days on the 1 mm (0.04 inches) threshold annually. Soma enjoys an average of 2941 hours of sunshine throughout the year, and daylight varies from 9 hours 35 minutes to 14 hours 43 minutes per day.

Monthly average temperatures in Soma, Japan

The warmest months in Soma are July, August and September, with daily mean temperatures ranging from 22 to 25 °C (72 - 77 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 5 to 7 °C (40 - 45 °F) throughout the day. On average each year, Soma experiences 34 days above 25 °C (77.0 °F) and 3 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Soma. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum13°C
(56°F)		18°C
(64°F)		18°C
(64°F)		20°C
(69°F)		25°C
(77°F)		27°C
(80°F)		30°C
(86°F)		31°C
(88°F)		30°C
(86°F)		26°C
(78°F)		20°C
(69°F)		17°C
(63°F)
Mean maximum11°C
(52°F)		13°C
(55°F)		14°C
(58°F)		18°C
(65°F)		23°C
(74°F)		23°C
(74°F)		28°C
(83°F)		30°C
(86°F)		27°C
(81°F)		24°C
(75°F)		19°C
(66°F)		15°C
(59°F)
Average high6°C
(44°F)		7°C
(45°F)		10°C
(49°F)		13°C
(55°F)		17°C
(64°F)		20°C
(69°F)		24°C
(75°F)		26°C
(79°F)		23°C
(75°F)		19°C
(67°F)		15°C
(59°F)		9°C
(49°F)
Daily mean5°C
(40°F)		5°C
(41°F)		7°C
(46°F)		11°C
(51°F)		16°C
(60°F)		19°C
(66°F)		23°C
(73°F)		25°C
(77°F)		22°C
(72°F)		18°C
(64°F)		13°C
(55°F)		7°C
(45°F)
Average low3°C
(37°F)		3°C
(37°F)		5°C
(42°F)		8°C
(48°F)		14°C
(57°F)		18°C
(64°F)		22°C
(71°F)		24°C
(75°F)		21°C
(70°F)		16°C
(61°F)		11°C
(51°F)		5°C
(42°F)
Mean minimum-1°C
(31°F)		-0°C
(32°F)		2°C
(36°F)		4°C
(40°F)		9°C
(49°F)		15°C
(59°F)		19°C
(66°F)		21°C
(70°F)		18°C
(64°F)		12°C
(54°F)		6°C
(43°F)		1°C
(35°F)
Minimum-3°C
(27°F)		-1°C
(31°F)		0°C
(33°F)		2°C
(37°F)		7°C
(45°F)		13°C
(56°F)		17°C
(64°F)		20°C
(67°F)		16°C
(62°F)		11°C
(52°F)		4°C
(39°F)		-0°C
(32°F)

Compare climate in Soma with other places

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

Monthly average precipitation in Soma, Japan

Soma usually has the most precipitation in July, September and October, with an average of 15 rainy days and 229 mm (9.0 inches) of precipitation per month. The driest months in Soma are January, February and November. On average, 46 mm (1.8 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Soma. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)52 (2.1)41 (1.6)117 (4.6)115 (4.5)119 (4.7)105 (4.1)239 (9.4)158 (6.2)191 (7.5)257 (10.1)44 (1.7)60 (2.4)
Average precipitation days (≥ 1 mm)87911121218151512611

Monthly sunshine hours in Soma, Japan

The sunniest months in Soma are May, June and August, when the sun shines an average of 9 hours 19 minutes a day. Least sunny months in Soma: January, October and December receive an average of 6 hours 24 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Soma. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours175224262275292279256285242209225211
Mean daily daylight hours9h 51m10h 46m11h 57m13h 10m14h 12m14h 43m14h 27m13h 33m12h 23m11h 11m10h 7m9h 35m

Solar UV radiation in Soma, Japan

Soma experiences the highest level of ultraviolet (UV) radiation in May, July and August, when the maximum UV index can reach values of 10 - 11, which corresponds to the Very High / 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 Soma UV Index data.

Average daily maximum UV levels by month for Soma. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)3579101011119653