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Monthly climate in Sennan, Japan

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Sennan features a humid subtropical climate (Cfa). Temperatures typically range between 6 °C (44 °F) and 28 °C (83 °F) through the year, but rarely can drop to -1 °C (30 °F) or can rise to as high as 35 °C (95 °F). The average annual precipitation amounts to about 1834 mm (72.2 inches) and receives 137 rainy days on the 1 mm (0.04 inches) threshold annually. Sennan enjoys an average of 3071 hours of sunshine throughout the year, and daylight varies from 9 hours 53 minutes to 14 hours 23 minutes per day.

Monthly average temperatures in Sennan, Japan

The warmest months in Sennan are July, August and September, with daily mean temperatures ranging from 25 to 28 °C (77 - 83 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 6 to 9 °C (44 - 48 °F) throughout the day. On average each year, Sennan experiences 94 days above 25 °C (77.0 °F) and 2 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Sennan. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum17°C
(62°F)		18°C
(65°F)		20°C
(68°F)		23°C
(73°F)		28°C
(82°F)		28°C
(83°F)		34°C
(94°F)		35°C
(95°F)		33°C
(92°F)		29°C
(84°F)		24°C
(75°F)		21°C
(70°F)
Mean maximum14°C
(58°F)		15°C
(59°F)		18°C
(66°F)		22°C
(71°F)		26°C
(79°F)		27°C
(82°F)		32°C
(90°F)		34°C
(93°F)		32°C
(90°F)		27°C
(82°F)		22°C
(73°F)		17°C
(64°F)
Average high9°C
(49°F)		10°C
(49°F)		14°C
(57°F)		18°C
(64°F)		22°C
(72°F)		25°C
(77°F)		29°C
(84°F)		31°C
(88°F)		28°C
(82°F)		22°C
(73°F)		17°C
(63°F)		12°C
(53°F)
Daily mean6°C
(44°F)		7°C
(44°F)		10°C
(51°F)		14°C
(58°F)		19°C
(67°F)		22°C
(72°F)		26°C
(80°F)		28°C
(83°F)		25°C
(77°F)		20°C
(67°F)		14°C
(57°F)		9°C
(48°F)
Average low4°C
(39°F)		4°C
(39°F)		7°C
(45°F)		11°C
(52°F)		16°C
(60°F)		19°C
(67°F)		24°C
(76°F)		26°C
(78°F)		22°C
(72°F)		17°C
(62°F)		11°C
(51°F)		6°C
(43°F)
Mean minimum0°C
(32°F)		0°C
(33°F)		2°C
(36°F)		5°C
(41°F)		10°C
(50°F)		16°C
(61°F)		21°C
(71°F)		22°C
(73°F)		17°C
(63°F)		11°C
(53°F)		5°C
(42°F)		2°C
(37°F)
Minimum-1°C
(30°F)		-1°C
(31°F)		1°C
(34°F)		4°C
(39°F)		8°C
(47°F)		14°C
(58°F)		20°C
(69°F)		20°C
(68°F)		15°C
(60°F)		10°C
(49°F)		4°C
(40°F)		2°C
(35°F)

Compare climate in Sennan with other places

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

Monthly average precipitation in Sennan, Japan

Sennan usually has the most precipitation in July, September and October, with an average of 15 rainy days and 257 mm (10.1 inches) of precipitation per month. The driest months in Sennan are January, February and November. On average, 67 mm (2.6 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Sennan. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)63 (2.5)76 (3.0)115 (4.5)128 (5.1)164 (6.5)199 (7.8)302 (11.9)178 (7.0)203 (8.0)267 (10.5)63 (2.5)76 (3.0)
Average precipitation days (≥ 1 mm)991110101418121512710

Monthly sunshine hours in Sennan, Japan

The sunniest months in Sennan are April, May and August, when the sun shines an average of 9 hours 42 minutes a day. Least sunny months in Sennan: January, February and December receive an average of 6 hours 59 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Sennan. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours184229266282294274272315249240239220
Mean daily daylight hours10h 7m10h 55m11h 58m13h 2m13h 56m14h 23m14h 10m13h 23m12h 21m11h 17m10h 21m9h 53m

Solar UV radiation in Sennan, Japan

Sennan experiences the highest level of ultraviolet (UV) radiation in April, May and August, when the maximum UV index can reach values of 11 - 11, 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 Sennan UV Index data.

Average daily maximum UV levels by month for Sennan. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)458111111111110754