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Monthly climate in Nagaoka, Japan

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Nagaoka features a humid subtropical climate (Cfa). Temperatures typically range between 2 °C (37 °F) and 27 °C (82 °F) through the year, but rarely can drop to -10 °C (14 °F) or can rise to as high as 40 °C (105 °F). The average annual precipitation amounts to about 1885 mm (74.2 inches) and receives 211 rainy days on the 1 mm (0.04 inches) threshold annually. Nagaoka enjoys an average of 2892 hours of sunshine throughout the year, and daylight varies from 9 hours 36 minutes to 14 hours 41 minutes per day.

Monthly average temperatures in Nagaoka, Japan

The warmest months in Nagaoka are July, August and September, with daily mean temperatures ranging from 23 to 27 °C (73 - 82 °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, Nagaoka experiences 96 days above 25 °C (77.0 °F) and 41 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Nagaoka. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum13°C
(55°F)		18°C
(64°F)		22°C
(71°F)		27°C
(80°F)		33°C
(92°F)		34°C
(93°F)		40°C
(105°F)		40°C
(104°F)		38°C
(100°F)		33°C
(91°F)		25°C
(77°F)		20°C
(68°F)
Mean maximum10°C
(50°F)		13°C
(55°F)		20°C
(68°F)		24°C
(76°F)		30°C
(86°F)		30°C
(86°F)		35°C
(95°F)		38°C
(101°F)		33°C
(92°F)		29°C
(84°F)		22°C
(72°F)		15°C
(60°F)
Average high5°C
(42°F)		6°C
(44°F)		12°C
(53°F)		16°C
(62°F)		23°C
(73°F)		26°C
(79°F)		30°C
(86°F)		32°C
(89°F)		27°C
(81°F)		21°C
(70°F)		15°C
(59°F)		8°C
(47°F)
Daily mean2°C
(37°F)		3°C
(38°F)		7°C
(45°F)		12°C
(53°F)		18°C
(64°F)		21°C
(71°F)		26°C
(79°F)		27°C
(82°F)		23°C
(73°F)		17°C
(63°F)		11°C
(52°F)		5°C
(41°F)
Average low-0°C
(32°F)		-0°C
(32°F)		3°C
(38°F)		7°C
(45°F)		13°C
(55°F)		17°C
(63°F)		23°C
(73°F)		24°C
(75°F)		19°C
(67°F)		13°C
(56°F)		7°C
(45°F)		2°C
(36°F)
Mean minimum-5°C
(23°F)		-5°C
(23°F)		-2°C
(29°F)		1°C
(34°F)		7°C
(45°F)		13°C
(56°F)		20°C
(68°F)		19°C
(67°F)		13°C
(56°F)		7°C
(46°F)		0°C
(33°F)		-3°C
(27°F)
Minimum-10°C
(14°F)		-7°C
(20°F)		-4°C
(24°F)		-1°C
(30°F)		6°C
(44°F)		11°C
(51°F)		19°C
(66°F)		16°C
(61°F)		12°C
(54°F)		7°C
(45°F)		-1°C
(30°F)		-5°C
(23°F)

Compare climate in Nagaoka with other places

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

Monthly average precipitation in Nagaoka, Japan

Nagaoka usually has the most precipitation in July, August and December, with an average of 20 rainy days and 225 mm (8.8 inches) of precipitation per month. The driest months in Nagaoka are April, May and June. On average, 111 mm (4.4 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Nagaoka. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)165 (6.5)138 (5.4)130 (5.1)114 (4.5)110 (4.3)108 (4.3)283 (11.2)186 (7.3)151 (5.9)158 (6.2)139 (5.5)204 (8.0)
Average precipitation days (≥ 1 mm)212218141413181716151825

Monthly sunshine hours in Nagaoka, Japan

The sunniest months in Nagaoka are May, June and August, when the sun shines an average of 9 hours 43 minutes a day. Least sunny months in Nagaoka: January, February and December receive an average of 5 hours 40 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Nagaoka. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours142195245274303291280299253219208178
Mean daily daylight hours9h 53m10h 47m11h 57m13h 9m14h 10m14h 41m14h 25m13h 32m12h 23m11h 12m10h 9m9h 36m

Solar UV radiation in Nagaoka, Japan

Nagaoka 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 4. For more detailed information, check out our hourly Nagaoka UV Index data.

Average daily maximum UV levels by month for Nagaoka. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)3479101011119643