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Monthly climate in Minamata, Japan

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Minamata features a humid subtropical climate (Cfa). Temperatures typically range between 7 °C (44 °F) and 28 °C (82 °F) through the year, but rarely can drop to -4 °C (25 °F) or can rise to as high as 35 °C (96 °F). The average annual precipitation amounts to about 2286 mm (90.0 inches) and receives 153 rainy days on the 1 mm (0.04 inches) threshold annually. Minamata enjoys an average of 3085 hours of sunshine throughout the year, and daylight varies from 10 hours 3 minutes to 14 hours 12 minutes per day.

Monthly average temperatures in Minamata, Japan

The warmest months in Minamata 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 7 to 8 °C (44 - 47 °F) throughout the day. On average each year, Minamata experiences 115 days above 25 °C (77.0 °F) and 10 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Minamata. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum20°C
(68°F)		20°C
(69°F)		26°C
(78°F)		27°C
(82°F)		30°C
(87°F)		31°C
(89°F)		35°C
(96°F)		35°C
(96°F)		34°C
(94°F)		32°C
(89°F)		25°C
(77°F)		24°C
(75°F)
Mean maximum17°C
(63°F)		18°C
(64°F)		22°C
(72°F)		25°C
(78°F)		29°C
(84°F)		30°C
(86°F)		34°C
(93°F)		35°C
(95°F)		33°C
(92°F)		29°C
(85°F)		24°C
(75°F)		19°C
(67°F)
Average high11°C
(52°F)		12°C
(54°F)		16°C
(62°F)		20°C
(69°F)		24°C
(76°F)		27°C
(80°F)		30°C
(86°F)		32°C
(89°F)		29°C
(84°F)		24°C
(76°F)		18°C
(65°F)		12°C
(54°F)
Daily mean7°C
(44°F)		8°C
(46°F)		12°C
(54°F)		16°C
(61°F)		20°C
(68°F)		23°C
(74°F)		27°C
(80°F)		28°C
(82°F)		25°C
(77°F)		20°C
(68°F)		14°C
(57°F)		8°C
(47°F)
Average low3°C
(38°F)		4°C
(39°F)		8°C
(46°F)		12°C
(53°F)		16°C
(61°F)		20°C
(68°F)		24°C
(75°F)		25°C
(77°F)		22°C
(71°F)		16°C
(61°F)		9°C
(49°F)		4°C
(40°F)
Mean minimum-2°C
(28°F)		-1°C
(30°F)		2°C
(36°F)		5°C
(41°F)		9°C
(49°F)		16°C
(61°F)		21°C
(71°F)		22°C
(72°F)		17°C
(62°F)		10°C
(50°F)		3°C
(38°F)		-0°C
(32°F)
Minimum-4°C
(25°F)		-3°C
(27°F)		1°C
(34°F)		4°C
(39°F)		7°C
(45°F)		14°C
(58°F)		18°C
(65°F)		21°C
(71°F)		14°C
(57°F)		9°C
(48°F)		1°C
(34°F)		-1°C
(30°F)

Compare climate in Minamata with other places

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

Monthly average precipitation in Minamata, Japan

Minamata usually has the most precipitation in June, July and August, with an average of 19 rainy days and 350 mm (13.8 inches) of precipitation per month. The driest months in Minamata are January, November and December. On average, 82 mm (3.2 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Minamata. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)61 (2.4)105 (4.1)149 (5.9)143 (5.6)234 (9.2)342 (13.5)465 (18.3)242 (9.5)228 (9.0)131 (5.2)96 (3.8)90 (3.5)
Average precipitation days (≥ 1 mm)710141012182217161098

Monthly sunshine hours in Minamata, Japan

The sunniest months in Minamata are April, May and August, when the sun shines an average of 9 hours 28 minutes a day. Least sunny months in Minamata: January, February and December receive an average of 7 hours 7 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Minamata. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours188236267285281256273304263261240224
Mean daily daylight hours10h 17m11h 1m11h 59m12h 58m13h 47m14h 12m14h 0m13h 16m12h 20m11h 21m10h 30m10h 3m

Solar UV radiation in Minamata, Japan

Minamata experiences the highest level of ultraviolet (UV) radiation in May, July and August, when the maximum UV index can reach values of 12 - 13, 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 Minamata UV Index data.

Average daily maximum UV levels by month for Minamata. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)569111212121311864