nomadseason

Monthly climate in Nagasaki, Japan

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Nagasaki features a humid subtropical climate (Cfa). Temperatures typically range between 8 °C (47 °F) and 28 °C (82 °F) through the year, but rarely can drop to 0 °C (32 °F) or can rise to as high as 33 °C (93 °F). The average annual precipitation amounts to about 2254 mm (88.7 inches) and receives 135 rainy days on the 1 mm (0.04 inches) threshold annually. Nagasaki enjoys an average of 2991 hours of sunshine throughout the year, and daylight varies from 10 hours 1 minutes to 14 hours 15 minutes per day.

Monthly average temperatures in Nagasaki, Japan

The warmest months in Nagasaki are July, August and September, with daily mean temperatures ranging from 25 to 28 °C (77 - 82 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 8 to 10 °C (47 - 51 °F) throughout the day. On average each year, Nagasaki experiences 81 days above 25 °C (77.0 °F) and 0 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Nagasaki. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum18°C
(65°F)		17°C
(63°F)		20°C
(68°F)		23°C
(73°F)		25°C
(77°F)		27°C
(81°F)		32°C
(89°F)		33°C
(93°F)		32°C
(90°F)		28°C
(83°F)		23°C
(74°F)		22°C
(71°F)
Mean maximum16°C
(60°F)		15°C
(60°F)		18°C
(65°F)		21°C
(70°F)		24°C
(75°F)		26°C
(79°F)		30°C
(86°F)		32°C
(90°F)		30°C
(86°F)		27°C
(80°F)		22°C
(72°F)		18°C
(65°F)
Average high10°C
(51°F)		11°C
(51°F)		14°C
(58°F)		17°C
(64°F)		21°C
(70°F)		24°C
(76°F)		27°C
(82°F)		29°C
(85°F)		27°C
(80°F)		23°C
(73°F)		17°C
(64°F)		12°C
(54°F)
Daily mean8°C
(47°F)		9°C
(48°F)		12°C
(54°F)		15°C
(60°F)		19°C
(67°F)		22°C
(73°F)		26°C
(79°F)		28°C
(82°F)		25°C
(77°F)		20°C
(69°F)		15°C
(60°F)		10°C
(51°F)
Average low7°C
(44°F)		7°C
(44°F)		10°C
(50°F)		13°C
(56°F)		17°C
(63°F)		21°C
(70°F)		25°C
(77°F)		26°C
(79°F)		23°C
(74°F)		19°C
(66°F)		14°C
(57°F)		9°C
(48°F)
Mean minimum2°C
(37°F)		2°C
(36°F)		6°C
(42°F)		9°C
(48°F)		13°C
(56°F)		18°C
(65°F)		22°C
(72°F)		24°C
(75°F)		20°C
(68°F)		15°C
(58°F)		9°C
(48°F)		4°C
(39°F)
Minimum-0°C
(32°F)		0°C
(33°F)		5°C
(41°F)		7°C
(46°F)		12°C
(54°F)		18°C
(64°F)		21°C
(70°F)		21°C
(69°F)		19°C
(66°F)		14°C
(57°F)		8°C
(46°F)		2°C
(36°F)

Compare climate in Nagasaki with other places

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

Monthly average precipitation in Nagasaki, Japan

Nagasaki usually has the most precipitation in June, July and August, with an average of 15 rainy days and 347 mm (13.7 inches) of precipitation per month. The driest months in Nagasaki are January, November and December. On average, 78 mm (3.1 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Nagasaki. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)61 (2.4)106 (4.2)157 (6.2)143 (5.6)229 (9.0)272 (10.7)442 (17.4)326 (12.8)225 (8.9)117 (4.6)81 (3.2)92 (3.6)
Average precipitation days (≥ 1 mm)8101291114181414898

Monthly sunshine hours in Nagasaki, Japan

The sunniest months in Nagasaki are April, May and August, when the sun shines an average of 9 hours 22 minutes a day. Least sunny months in Nagasaki: January, February 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 Nagasaki. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours167225261281279259271301260259232190
Mean daily daylight hours10h 14m11h 0m11h 58m12h 59m13h 49m14h 15m14h 2m13h 18m12h 20m11h 20m10h 28m10h 1m

Solar UV radiation in Nagasaki, Japan

Nagasaki experiences the highest level of ultraviolet (UV) radiation in April, July and August, when the maximum UV index can reach values of 11 - 12, which corresponds to the Extreme category of sun exposure. January, February and December are in the Moderate / High exposure category. In these months, the maximum values of the UV index do not exceed 6. For more detailed information, check out our hourly Nagasaki UV Index data.

Average daily maximum UV levels by month for Nagasaki. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)468111111121211864