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Monthly climate in Rio Maior, Portugal

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Rio Maior features a warm-summer Mediterranean climate (Csb). Temperatures typically range between 10 °C (51 °F) and 21 °C (70 °F) through the year, but rarely can drop to -1 °C (30 °F) or can rise to as high as 40 °C (105 °F). The average annual precipitation amounts to about 552 mm (21.7 inches) and receives 74 rainy days on the 1 mm (0.04 inches) threshold annually. Rio Maior enjoys an average of 3810 hours of sunshine throughout the year, and daylight varies from 9 hours 27 minutes to 14 hours 51 minutes per day.

Monthly average temperatures in Rio Maior, Portugal

The warmest months in Rio Maior are July, August and September, with daily mean temperatures ranging from 21 to 21 °C (69 - 70 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 10 to 12 °C (51 - 54 °F) throughout the day. On average each year, Rio Maior experiences 69 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 Rio Maior. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum20°C
(69°F)		24°C
(76°F)		27°C
(82°F)		28°C
(83°F)		35°C
(95°F)		38°C
(101°F)		38°C
(101°F)		40°C
(105°F)		35°C
(95°F)		35°C
(95°F)		25°C
(77°F)		19°C
(66°F)
Mean maximum18°C
(65°F)		21°C
(71°F)		24°C
(75°F)		26°C
(78°F)		31°C
(88°F)		32°C
(89°F)		34°C
(93°F)		34°C
(94°F)		33°C
(91°F)		29°C
(85°F)		22°C
(72°F)		18°C
(65°F)
Average high14°C
(58°F)		16°C
(62°F)		17°C
(63°F)		19°C
(66°F)		23°C
(73°F)		24°C
(75°F)		26°C
(79°F)		27°C
(81°F)		26°C
(79°F)		23°C
(73°F)		17°C
(63°F)		15°C
(60°F)
Daily mean10°C
(51°F)		12°C
(54°F)		13°C
(56°F)		15°C
(59°F)		18°C
(64°F)		19°C
(67°F)		21°C
(70°F)		21°C
(70°F)		21°C
(69°F)		18°C
(65°F)		14°C
(57°F)		12°C
(54°F)
Average low7°C
(45°F)		9°C
(48°F)		10°C
(50°F)		11°C
(53°F)		14°C
(57°F)		15°C
(60°F)		17°C
(63°F)		17°C
(63°F)		16°C
(62°F)		14°C
(58°F)		11°C
(52°F)		9°C
(49°F)
Mean minimum1°C
(35°F)		4°C
(40°F)		6°C
(43°F)		7°C
(45°F)		10°C
(49°F)		13°C
(56°F)		14°C
(58°F)		15°C
(59°F)		13°C
(56°F)		10°C
(50°F)		6°C
(44°F)		4°C
(39°F)
Minimum-1°C
(30°F)		2°C
(36°F)		5°C
(41°F)		6°C
(43°F)		8°C
(47°F)		11°C
(53°F)		14°C
(57°F)		14°C
(58°F)		12°C
(54°F)		8°C
(46°F)		5°C
(41°F)		1°C
(35°F)

Compare climate in Rio Maior with other places

Compare temperature, precipitation, sunshine, UV index in Rio Maior, Portugal with other places around the world.

Monthly average precipitation in Rio Maior, Portugal

Rio Maior usually has the most precipitation in March, April and November, with an average of 10 rainy days and 81 mm (3.2 inches) of precipitation per month. The driest months in Rio Maior are June, July and August. On average, 9 mm (0.4 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Rio Maior. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)41 (1.6)53 (2.1)74 (2.9)82 (3.2)39 (1.5)16 (0.6)6 (0.2)6 (0.2)27 (1.1)58 (2.3)88 (3.5)64 (2.5)
Average precipitation days (≥ 1 mm)57912551136119

Monthly sunshine hours in Rio Maior, Portugal

The sunniest months in Rio Maior are May, June and July, when the sun shines an average of 13 hours 27 minutes a day. Least sunny months in Rio Maior: January, February and December receive an average of 6 hours 53 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Rio Maior. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours180227305351407409420394349312232218
Mean daily daylight hours9h 45m10h 43m11h 58m13h 14m14h 19m14h 51m14h 34m13h 37m12h 23m11h 7m10h 1m9h 27m

Solar UV radiation in Rio Maior, Portugal

Rio Maior experiences the highest level of ultraviolet (UV) radiation in May, June and July, when the maximum UV index can reach values of 10 - 11, which corresponds to the Very High / 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 4. For more detailed information, check out our hourly Rio Maior UV Index data.

Average daily maximum UV levels by month for Rio Maior. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)356910111098643