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Monthly climate in Nagai, Japan

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Nagai features a humid continental climate (Dfb). Temperatures typically range between -2 °C (28 °F) and 23 °C (74 °F) through the year, but rarely can drop to -16 °C (3 °F) or can rise to as high as 34 °C (93 °F). The average annual precipitation amounts to about 2026 mm (79.8 inches) and receives 220 rainy days on the 1 mm (0.04 inches) threshold annually. Nagai enjoys an average of 2721 hours of sunshine throughout the year, and daylight varies from 9 hours 34 minutes to 14 hours 43 minutes per day.

Monthly average temperatures in Nagai, Japan

The warmest months in Nagai are July, August and September, with daily mean temperatures ranging from 19 to 23 °C (66 - 74 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -2 to 0 °C (28 - 33 °F) throughout the day. On average each year, Nagai experiences 44 days above 25 °C (77.0 °F) and 110 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Nagai. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum6°C
(44°F)		10°C
(50°F)		18°C
(65°F)		24°C
(75°F)		31°C
(88°F)		32°C
(89°F)		33°C
(92°F)		34°C
(93°F)		31°C
(89°F)		26°C
(79°F)		20°C
(69°F)		16°C
(61°F)
Mean maximum5°C
(41°F)		7°C
(46°F)		14°C
(58°F)		21°C
(71°F)		27°C
(80°F)		26°C
(80°F)		31°C
(88°F)		32°C
(91°F)		28°C
(83°F)		24°C
(76°F)		18°C
(64°F)		10°C
(51°F)
Average high0°C
(33°F)		1°C
(35°F)		6°C
(43°F)		12°C
(54°F)		19°C
(67°F)		22°C
(72°F)		26°C
(78°F)		27°C
(81°F)		22°C
(73°F)		17°C
(62°F)		11°C
(51°F)		3°C
(38°F)
Daily mean-2°C
(28°F)		-2°C
(29°F)		2°C
(36°F)		8°C
(46°F)		14°C
(58°F)		18°C
(64°F)		22°C
(72°F)		23°C
(74°F)		19°C
(66°F)		13°C
(55°F)		7°C
(44°F)		0°C
(33°F)
Average low-5°C
(24°F)		-5°C
(24°F)		-1°C
(30°F)		3°C
(38°F)		10°C
(50°F)		14°C
(58°F)		19°C
(67°F)		20°C
(69°F)		15°C
(60°F)		10°C
(49°F)		3°C
(37°F)		-3°C
(27°F)
Mean minimum-10°C
(14°F)		-10°C
(14°F)		-8°C
(17°F)		-3°C
(26°F)		4°C
(39°F)		9°C
(49°F)		15°C
(60°F)		15°C
(60°F)		9°C
(49°F)		3°C
(38°F)		-4°C
(25°F)		-9°C
(16°F)
Minimum-12°C
(10°F)		-16°C
(3°F)		-12°C
(11°F)		-6°C
(22°F)		2°C
(35°F)		6°C
(44°F)		14°C
(57°F)		12°C
(54°F)		7°C
(45°F)		3°C
(37°F)		-10°C
(15°F)		-12°C
(11°F)

Compare climate in Nagai with other places

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

Monthly average precipitation in Nagai, Japan

Nagai usually has the most precipitation in July, August and December, with an average of 21 rainy days and 241 mm (9.5 inches) of precipitation per month. The driest months in Nagai are May, June and November. On average, 124 mm (4.9 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Nagai. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)169 (6.6)167 (6.6)153 (6.0)138 (5.4)120 (4.7)135 (5.3)298 (11.7)221 (8.7)140 (5.5)164 (6.5)118 (4.7)203 (8.0)
Average precipitation days (≥ 1 mm)212220161516202015141625

Monthly sunshine hours in Nagai, Japan

The sunniest months in Nagai are May, June and August, when the sun shines an average of 9 hours 10 minutes a day. Least sunny months in Nagai: January, February and December receive an average of 5 hours 9 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Nagai. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours133181240264289276262278241199200153
Mean daily daylight hours9h 50m10h 46m11h 57m13h 10m14h 12m14h 43m14h 28m13h 34m12h 24m11h 11m10h 7m9h 34m

Solar UV radiation in Nagai, Japan

Nagai experiences the highest level of ultraviolet (UV) radiation in June, July 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 Nagai UV Index data.

Average daily maximum UV levels by month for Nagai. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)3589101111119753