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Monthly climate in Nambu, Japan

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Nambu features a humid subtropical climate (Cfa). Temperatures typically range between 2 °C (37 °F) and 24 °C (76 °F) through the year, but rarely can drop to -9 °C (16 °F) or can rise to as high as 34 °C (93 °F). The average annual precipitation amounts to about 2972 mm (117.0 inches) and receives 203 rainy days on the 1 mm (0.04 inches) threshold annually. Nambu enjoys an average of 2998 hours of sunshine throughout the year, and daylight varies from 9 hours 48 minutes to 14 hours 28 minutes per day.

Monthly average temperatures in Nambu, Japan

The warmest months in Nambu are July, August and September, with daily mean temperatures ranging from 21 to 24 °C (69 - 76 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 2 to 5 °C (37 - 41 °F) throughout the day. On average each year, Nambu experiences 53 days above 25 °C (77.0 °F) and 49 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Nambu. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum15°C
(60°F)		18°C
(65°F)		22°C
(72°F)		25°C
(77°F)		27°C
(81°F)		29°C
(84°F)		32°C
(91°F)		34°C
(93°F)		32°C
(90°F)		29°C
(84°F)		21°C
(70°F)		18°C
(65°F)
Mean maximum12°C
(54°F)		15°C
(58°F)		19°C
(67°F)		22°C
(72°F)		26°C
(79°F)		26°C
(79°F)		30°C
(87°F)		32°C
(90°F)		29°C
(85°F)		27°C
(80°F)		20°C
(68°F)		15°C
(59°F)
Average high6°C
(44°F)		8°C
(46°F)		12°C
(53°F)		15°C
(60°F)		20°C
(68°F)		22°C
(72°F)		26°C
(79°F)		28°C
(82°F)		24°C
(75°F)		19°C
(67°F)		15°C
(59°F)		9°C
(49°F)
Daily mean2°C
(37°F)		3°C
(38°F)		7°C
(45°F)		11°C
(52°F)		16°C
(61°F)		19°C
(66°F)		23°C
(73°F)		24°C
(76°F)		21°C
(69°F)		15°C
(60°F)		10°C
(50°F)		5°C
(41°F)
Average low-1°C
(31°F)		-1°C
(31°F)		3°C
(37°F)		7°C
(44°F)		12°C
(53°F)		15°C
(60°F)		20°C
(68°F)		21°C
(71°F)		18°C
(64°F)		12°C
(55°F)		6°C
(43°F)		1°C
(35°F)
Mean minimum-6°C
(22°F)		-5°C
(23°F)		-2°C
(28°F)		1°C
(34°F)		5°C
(41°F)		12°C
(54°F)		17°C
(62°F)		18°C
(65°F)		13°C
(56°F)		6°C
(44°F)		1°C
(34°F)		-3°C
(27°F)
Minimum-9°C
(16°F)		-7°C
(19°F)		-4°C
(25°F)		-1°C
(30°F)		3°C
(37°F)		10°C
(50°F)		15°C
(60°F)		16°C
(60°F)		11°C
(52°F)		6°C
(42°F)		-0°C
(32°F)		-5°C
(24°F)

Compare climate in Nambu with other places

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

Monthly average precipitation in Nambu, Japan

Nambu usually has the most precipitation in July, August and October, with an average of 23 rainy days and 418 mm (16.5 inches) of precipitation per month. The driest months in Nambu are January, February and December. On average, 90 mm (3.5 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Nambu. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)76 (3.0)100 (3.9)246 (9.7)254 (10.0)239 (9.4)298 (11.7)550 (21.6)324 (12.8)301 (11.8)381 (15.0)109 (4.3)94 (3.7)
Average precipitation days (≥ 1 mm)81115171721262422201210

Monthly sunshine hours in Nambu, Japan

The sunniest months in Nambu are April, May and August, when the sun shines an average of 9 hours 23 minutes a day. Least sunny months in Nambu: January, October and November receive an average of 7 hours 2 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Nambu. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours193236265274292264239296244217235236
Mean daily daylight hours10h 3m10h 53m11h 58m13h 4m14h 0m14h 28m14h 14m13h 25m12h 22m11h 16m10h 18m9h 48m

Solar UV radiation in Nambu, Japan

Nambu 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, November 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 Nambu UV Index data.

Average daily maximum UV levels by month for Nambu. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)468101111121110754