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Monthly climate in Hayama, Japan

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Hayama features a humid subtropical climate (Cfa). Temperatures typically range between 8 °C (47 °F) and 27 °C (80 °F) through the year, but rarely can drop to 1 °C (34 °F) or can rise to as high as 31 °C (87 °F). The average annual precipitation amounts to about 1843 mm (72.6 inches) and receives 148 rainy days on the 1 mm (0.04 inches) threshold annually. Hayama enjoys an average of 2925 hours of sunshine throughout the year, and daylight varies from 9 hours 48 minutes to 14 hours 29 minutes per day.

Monthly average temperatures in Hayama, Japan

The warmest months in Hayama are July, August and September, with daily mean temperatures ranging from 24 to 27 °C (75 - 80 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 8 to 11 °C (47 - 52 °F) throughout the day. On average each year, Hayama experiences 55 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 Hayama. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum18°C
(64°F)		17°C
(63°F)		19°C
(66°F)		21°C
(70°F)		23°C
(74°F)		26°C
(79°F)		28°C
(83°F)		31°C
(87°F)		29°C
(84°F)		26°C
(79°F)		21°C
(71°F)		21°C
(69°F)
Mean maximum15°C
(59°F)		16°C
(61°F)		17°C
(63°F)		19°C
(67°F)		22°C
(72°F)		24°C
(75°F)		28°C
(82°F)		30°C
(85°F)		28°C
(83°F)		25°C
(77°F)		21°C
(70°F)		18°C
(65°F)
Average high10°C
(50°F)		11°C
(52°F)		13°C
(56°F)		16°C
(61°F)		19°C
(67°F)		22°C
(72°F)		25°C
(78°F)		27°C
(82°F)		25°C
(78°F)		21°C
(70°F)		17°C
(63°F)		13°C
(55°F)
Daily mean8°C
(47°F)		8°C
(47°F)		11°C
(52°F)		14°C
(58°F)		18°C
(65°F)		21°C
(70°F)		25°C
(77°F)		27°C
(80°F)		24°C
(75°F)		20°C
(68°F)		15°C
(60°F)		11°C
(52°F)
Average low6°C
(43°F)		6°C
(44°F)		9°C
(49°F)		12°C
(54°F)		17°C
(63°F)		20°C
(69°F)		24°C
(75°F)		26°C
(78°F)		23°C
(73°F)		18°C
(65°F)		14°C
(57°F)		9°C
(48°F)
Mean minimum3°C
(38°F)		3°C
(38°F)		5°C
(41°F)		8°C
(46°F)		13°C
(56°F)		18°C
(64°F)		21°C
(70°F)		22°C
(73°F)		19°C
(67°F)		14°C
(58°F)		9°C
(48°F)		5°C
(41°F)
Minimum1°C
(34°F)		2°C
(36°F)		3°C
(38°F)		6°C
(43°F)		12°C
(54°F)		16°C
(62°F)		19°C
(66°F)		21°C
(70°F)		18°C
(65°F)		13°C
(56°F)		6°C
(43°F)		3°C
(37°F)

Compare climate in Hayama with other places

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

Monthly average precipitation in Hayama, Japan

Hayama usually has the most precipitation in July, September and October, with an average of 17 rainy days and 246 mm (9.7 inches) of precipitation per month. The driest months in Hayama are January, February and December. On average, 69 mm (2.7 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Hayama. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)64 (2.5)62 (2.4)172 (6.8)141 (5.5)148 (5.8)197 (7.8)226 (8.9)129 (5.1)208 (8.2)303 (11.9)111 (4.4)82 (3.2)
Average precipitation days (≥ 1 mm)6812121113171217171211

Monthly sunshine hours in Hayama, Japan

The sunniest months in Hayama are April, May and August, when the sun shines an average of 9 hours 15 minutes a day. Least sunny months in Hayama: January, February and October 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 Hayama. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours187224254269286262248297239204226225
Mean daily daylight hours10h 3m10h 53m11h 58m13h 4m14h 1m14h 29m14h 15m13h 26m12h 22m11h 16m10h 18m9h 48m

Solar UV radiation in Hayama, Japan

Hayama 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, 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 Hayama UV Index data.

Average daily maximum UV levels by month for Hayama. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)458101111111110754