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Monthly climate in Sasayama, Japan

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Sasayama features a humid subtropical climate (Cfa). Temperatures typically range between 4 °C (40 °F) and 28 °C (82 °F) through the year, but rarely can drop to -8 °C (19 °F) or can rise to as high as 37 °C (99 °F). The average annual precipitation amounts to about 1731 mm (68.1 inches) and receives 132 rainy days on the 1 mm (0.04 inches) threshold annually. Sasayama enjoys an average of 2856 hours of sunshine throughout the year, and daylight varies from 9 hours 50 minutes to 14 hours 26 minutes per day.

Monthly average temperatures in Sasayama, Japan

The warmest months in Sasayama are July, August and September, with daily mean temperatures ranging from 23 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 4 to 6 °C (40 - 44 °F) throughout the day. On average each year, Sasayama experiences 100 days above 25 °C (77.0 °F) and 30 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Sasayama. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum16°C
(60°F)		19°C
(66°F)		23°C
(73°F)		26°C
(78°F)		30°C
(87°F)		32°C
(90°F)		37°C
(98°F)		37°C
(99°F)		34°C
(94°F)		30°C
(87°F)		23°C
(74°F)		21°C
(69°F)
Mean maximum13°C
(56°F)		15°C
(59°F)		21°C
(69°F)		24°C
(75°F)		28°C
(84°F)		30°C
(86°F)		34°C
(94°F)		36°C
(97°F)		32°C
(90°F)		29°C
(84°F)		22°C
(72°F)		16°C
(61°F)
Average high8°C
(46°F)		9°C
(48°F)		14°C
(57°F)		18°C
(65°F)		23°C
(74°F)		26°C
(79°F)		30°C
(85°F)		32°C
(89°F)		27°C
(81°F)		22°C
(71°F)		16°C
(62°F)		10°C
(51°F)
Daily mean4°C
(40°F)		5°C
(41°F)		9°C
(49°F)		13°C
(56°F)		19°C
(66°F)		22°C
(72°F)		26°C
(79°F)		28°C
(82°F)		23°C
(75°F)		18°C
(65°F)		12°C
(54°F)		6°C
(44°F)
Average low1°C
(33°F)		1°C
(34°F)		5°C
(41°F)		9°C
(48°F)		14°C
(58°F)		18°C
(65°F)		23°C
(74°F)		25°C
(76°F)		20°C
(69°F)		15°C
(59°F)		8°C
(46°F)		3°C
(37°F)
Mean minimum-5°C
(24°F)		-4°C
(24°F)		-1°C
(30°F)		2°C
(36°F)		7°C
(44°F)		13°C
(56°F)		20°C
(68°F)		20°C
(69°F)		15°C
(59°F)		9°C
(48°F)		2°C
(35°F)		-3°C
(27°F)
Minimum-6°C
(21°F)		-8°C
(19°F)		-2°C
(29°F)		0°C
(33°F)		5°C
(42°F)		11°C
(52°F)		19°C
(66°F)		18°C
(64°F)		12°C
(53°F)		7°C
(44°F)		0°C
(33°F)		-6°C
(21°F)

Compare climate in Sasayama with other places

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

Monthly average precipitation in Sasayama, Japan

Sasayama usually has the most precipitation in July, August and October, with an average of 15 rainy days and 260 mm (10.2 inches) of precipitation per month. The driest months in Sasayama are January, February and November. On average, 49 mm (1.9 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Sasayama. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)46 (1.8)59 (2.3)111 (4.4)141 (5.6)140 (5.5)147 (5.8)327 (12.9)223 (8.8)205 (8.1)230 (9.1)43 (1.7)60 (2.4)
Average precipitation days (≥ 1 mm)78111010132114141257

Monthly sunshine hours in Sasayama, Japan

The sunniest months in Sasayama are April, May and August, when the sun shines an average of 9 hours 6 minutes a day. Least sunny months in Sasayama: January, February and December receive an average of 6 hours 22 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Sasayama. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours169207249269281260250288231223223203
Mean daily daylight hours10h 5m10h 54m11h 58m13h 3m13h 59m14h 26m14h 12m13h 24m12h 21m11h 16m10h 19m9h 50m

Solar UV radiation in Sasayama, Japan

Sasayama experiences the highest level of ultraviolet (UV) radiation in May, July and August, when the maximum UV index can reach values of 11 - 11, 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 Sasayama UV Index data.

Average daily maximum UV levels by month for Sasayama. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)468101111111110753