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Monthly climate in San Martino in Rio, Italy

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification San Martino in Rio features a humid subtropical climate (Cfa). Temperatures typically range between 3 °C (38 °F) and 26 °C (79 °F) through the year, but rarely can drop to -9 °C (16 °F) or can rise to as high as 39 °C (103 °F). The average annual precipitation amounts to about 846 mm (33.3 inches) and receives 110 rainy days on the 1 mm (0.04 inches) threshold annually. San Martino in Rio enjoys an average of 3785 hours of sunshine throughout the year, and daylight varies from 8 hours 51 minutes to 15 hours 29 minutes per day.

Monthly average temperatures in San Martino in Rio, Italy

The warmest months in San Martino in Rio are June, July and August, with daily mean temperatures ranging from 24 to 26 °C (75 - 79 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 3 to 7 °C (38 - 44 °F) throughout the day. On average each year, San Martino in Rio experiences 99 days above 25 °C (77.0 °F) and 36 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in San Martino in Rio. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum15°C
(58°F)		20°C
(69°F)		24°C
(75°F)		27°C
(81°F)		32°C
(90°F)		39°C
(103°F)		37°C
(99°F)		39°C
(103°F)		34°C
(93°F)		28°C
(83°F)		19°C
(67°F)		15°C
(59°F)
Mean maximum13°C
(56°F)		17°C
(63°F)		22°C
(71°F)		24°C
(76°F)		28°C
(83°F)		33°C
(92°F)		36°C
(96°F)		37°C
(98°F)		31°C
(89°F)		25°C
(77°F)		18°C
(64°F)		13°C
(56°F)
Average high8°C
(46°F)		11°C
(52°F)		15°C
(59°F)		19°C
(66°F)		23°C
(73°F)		29°C
(85°F)		31°C
(88°F)		31°C
(89°F)		26°C
(79°F)		20°C
(68°F)		13°C
(56°F)		8°C
(47°F)
Daily mean3°C
(38°F)		7°C
(44°F)		9°C
(49°F)		14°C
(57°F)		18°C
(65°F)		24°C
(75°F)		26°C
(78°F)		26°C
(79°F)		20°C
(69°F)		15°C
(59°F)		10°C
(50°F)		5°C
(41°F)
Average low-0°C
(32°F)		3°C
(37°F)		4°C
(40°F)		8°C
(48°F)		13°C
(56°F)		18°C
(65°F)		20°C
(69°F)		21°C
(69°F)		16°C
(61°F)		11°C
(52°F)		7°C
(45°F)		2°C
(35°F)
Mean minimum-4°C
(25°F)		-3°C
(27°F)		-2°C
(30°F)		3°C
(37°F)		8°C
(47°F)		14°C
(57°F)		17°C
(62°F)		16°C
(60°F)		10°C
(50°F)		6°C
(42°F)		0°C
(33°F)		-3°C
(28°F)
Minimum-6°C
(21°F)		-8°C
(18°F)		-9°C
(16°F)		-0°C
(32°F)		5°C
(42°F)		12°C
(54°F)		15°C
(59°F)		13°C
(56°F)		8°C
(46°F)		4°C
(40°F)		-1°C
(30°F)		-4°C
(25°F)

Compare climate in San Martino in Rio with other places

Compare temperature, precipitation, sunshine, UV index in San Martino in Rio, Italy with other places around the world.

Monthly average precipitation in San Martino in Rio, Italy

San Martino in Rio usually has the most precipitation in May, September and November, with an average of 12 rainy days and 106 mm (4.2 inches) of precipitation per month. The driest months in San Martino in Rio are January, March and June. On average, 41 mm (1.6 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in San Martino in Rio. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)24 (0.9)62 (2.4)51 (2.0)74 (2.9)111 (4.4)49 (1.9)66 (2.6)58 (2.3)93 (3.7)66 (2.6)114 (4.5)78 (3.1)
Average precipitation days (≥ 1 mm)488101481091071210

Monthly sunshine hours in San Martino in Rio, Italy

The sunniest months in San Martino in Rio are June, July and August, when the sun shines an average of 13 hours 35 minutes a day. Least sunny months in San Martino in Rio: January, November and December receive an average of 6 hours 47 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in San Martino in Rio. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours190229310344390418431399337300224208
Mean daily daylight hours9h 14m10h 25m11h 56m13h 30m14h 49m15h 29m15h 8m13h 57m12h 28m10h 55m9h 34m8h 51m

Solar UV radiation in San Martino in Rio, Italy

San Martino in Rio experiences the highest level of ultraviolet (UV) radiation in June, July and August, when the maximum UV index can reach values of 8 - 9, which corresponds to the Very High category of sun exposure. January, February and December are in the Low / Moderate exposure category. In these months, the maximum values of the UV index do not exceed 3. For more detailed information, check out our hourly San Martino in Rio UV Index data.

Average daily maximum UV levels by month for San Martino in Rio. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)235689986532