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Monthly climate in Ryugasaki, Japan

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Ryugasaki features a humid subtropical climate (Cfa). Temperatures typically range between 5 °C (40 °F) and 28 °C (82 °F) through the year, but rarely can drop to -6 °C (22 °F) or can rise to as high as 37 °C (99 °F). The average annual precipitation amounts to about 1481 mm (58.3 inches) and receives 144 rainy days on the 1 mm (0.04 inches) threshold annually. Ryugasaki enjoys an average of 2997 hours of sunshine throughout the year, and daylight varies from 9 hours 44 minutes to 14 hours 33 minutes per day.

Monthly average temperatures in Ryugasaki, Japan

The warmest months in Ryugasaki are July, August and September, with daily mean temperatures ranging from 24 to 28 °C (75 - 82 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 5 to 7 °C (40 - 45 °F) throughout the day. On average each year, Ryugasaki experiences 99 days above 25 °C (77.0 °F) and 28 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Ryugasaki. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum17°C
(63°F)		21°C
(70°F)		24°C
(76°F)		29°C
(84°F)		33°C
(92°F)		33°C
(92°F)		36°C
(98°F)		37°C
(99°F)		35°C
(96°F)		33°C
(91°F)		24°C
(75°F)		21°C
(70°F)
Mean maximum15°C
(60°F)		17°C
(64°F)		22°C
(72°F)		26°C
(79°F)		30°C
(87°F)		30°C
(86°F)		34°C
(94°F)		36°C
(97°F)		33°C
(92°F)		29°C
(85°F)		22°C
(73°F)		19°C
(66°F)
Average high9°C
(49°F)		11°C
(52°F)		15°C
(59°F)		19°C
(66°F)		24°C
(75°F)		26°C
(79°F)		29°C
(85°F)		32°C
(89°F)		27°C
(81°F)		22°C
(72°F)		17°C
(63°F)		12°C
(53°F)
Daily mean5°C
(40°F)		6°C
(43°F)		10°C
(51°F)		14°C
(58°F)		19°C
(67°F)		22°C
(72°F)		26°C
(79°F)		28°C
(82°F)		24°C
(75°F)		18°C
(65°F)		13°C
(56°F)		7°C
(45°F)
Average low0°C
(33°F)		2°C
(35°F)		6°C
(42°F)		10°C
(50°F)		15°C
(60°F)		19°C
(67°F)		23°C
(74°F)		25°C
(77°F)		21°C
(70°F)		15°C
(60°F)		9°C
(49°F)		3°C
(38°F)
Mean minimum-4°C
(25°F)		-3°C
(27°F)		-0°C
(32°F)		4°C
(39°F)		9°C
(48°F)		16°C
(61°F)		19°C
(67°F)		20°C
(69°F)		16°C
(61°F)		10°C
(50°F)		3°C
(38°F)		-2°C
(29°F)
Minimum-6°C
(22°F)		-4°C
(25°F)		-2°C
(28°F)		1°C
(34°F)		6°C
(43°F)		14°C
(58°F)		18°C
(64°F)		17°C
(63°F)		13°C
(57°F)		7°C
(45°F)		1°C
(33°F)		-4°C
(26°F)

Compare climate in Ryugasaki with other places

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

Monthly average precipitation in Ryugasaki, Japan

Ryugasaki usually has the most precipitation in July, September and October, with an average of 16 rainy days and 209 mm (8.2 inches) of precipitation per month. The driest months in Ryugasaki are January, February and December. On average, 50 mm (2.0 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Ryugasaki. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)47 (1.8)42 (1.7)128 (5.0)112 (4.4)125 (4.9)144 (5.7)218 (8.6)108 (4.3)171 (6.7)238 (9.4)86 (3.4)62 (2.4)
Average precipitation days (≥ 1 mm)58121112151914171498

Monthly sunshine hours in Ryugasaki, Japan

The sunniest months in Ryugasaki are April, May and August, when the sun shines an average of 9 hours 24 minutes a day. Least sunny months in Ryugasaki: January, October and December receive an average of 6 hours 46 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Ryugasaki. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours188235260279289271258295245216230225
Mean daily daylight hours9h 59m10h 51m11h 57m13h 6m14h 4m14h 33m14h 18m13h 28m12h 22m11h 14m10h 15m9h 44m

Solar UV radiation in Ryugasaki, Japan

Ryugasaki experiences the highest level of ultraviolet (UV) radiation in June, 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 5. For more detailed information, check out our hourly Ryugasaki UV Index data.

Average daily maximum UV levels by month for Ryugasaki. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)3579101111109753