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Monthly climate in Castro Marim, Portugal

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Castro Marim features a hot-summer Mediterranean climate (Csa). Temperatures typically range between 11 °C (52 °F) and 26 °C (79 °F) through the year, but rarely can drop to 2 °C (35 °F) or can rise to as high as 39 °C (103 °F). The average annual precipitation amounts to about 331 mm (13.0 inches) and receives 43 rainy days on the 1 mm (0.04 inches) threshold annually. Castro Marim enjoys an average of 3911 hours of sunshine throughout the year, and daylight varies from 9 hours 38 minutes to 14 hours 39 minutes per day.

Monthly average temperatures in Castro Marim, Portugal

The warmest months in Castro Marim are July, August and September, 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 11 to 13 °C (52 - 55 °F) throughout the day. On average each year, Castro Marim experiences 119 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 Castro Marim. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum21°C
(69°F)		22°C
(72°F)		24°C
(76°F)		28°C
(82°F)		35°C
(94°F)		38°C
(101°F)		37°C
(99°F)		39°C
(103°F)		35°C
(95°F)		33°C
(92°F)		25°C
(77°F)		21°C
(70°F)
Mean maximum19°C
(66°F)		21°C
(70°F)		23°C
(73°F)		25°C
(78°F)		31°C
(88°F)		32°C
(90°F)		35°C
(96°F)		37°C
(99°F)		33°C
(91°F)		31°C
(89°F)		23°C
(74°F)		19°C
(67°F)
Average high15°C
(59°F)		17°C
(62°F)		18°C
(65°F)		20°C
(68°F)		25°C
(77°F)		27°C
(82°F)		31°C
(88°F)		32°C
(90°F)		29°C
(84°F)		25°C
(77°F)		19°C
(66°F)		16°C
(62°F)
Daily mean11°C
(52°F)		13°C
(55°F)		14°C
(58°F)		16°C
(61°F)		20°C
(68°F)		22°C
(73°F)		25°C
(78°F)		26°C
(79°F)		24°C
(75°F)		20°C
(68°F)		15°C
(59°F)		13°C
(55°F)
Average low8°C
(46°F)		9°C
(49°F)		11°C
(51°F)		12°C
(55°F)		15°C
(60°F)		17°C
(63°F)		20°C
(67°F)		20°C
(69°F)		19°C
(67°F)		16°C
(60°F)		12°C
(54°F)		10°C
(50°F)
Mean minimum4°C
(39°F)		6°C
(43°F)		6°C
(44°F)		9°C
(48°F)		11°C
(51°F)		14°C
(57°F)		16°C
(61°F)		16°C
(61°F)		15°C
(59°F)		11°C
(52°F)		8°C
(46°F)		6°C
(43°F)
Minimum2°C
(35°F)		3°C
(37°F)		4°C
(40°F)		8°C
(46°F)		8°C
(47°F)		13°C
(55°F)		15°C
(58°F)		15°C
(60°F)		13°C
(56°F)		8°C
(46°F)		6°C
(42°F)		4°C
(39°F)

Compare climate in Castro Marim with other places

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

Monthly average precipitation in Castro Marim, Portugal

Castro Marim usually has the most precipitation in March, April and November, with an average of 7 rainy days and 54 mm (2.1 inches) of precipitation per month. The driest months in Castro Marim are June, July and August. On average, 3 mm (0.1 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Castro Marim. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)22 (0.9)38 (1.5)54 (2.1)55 (2.2)19 (0.8)5 (0.2)2 (0.1)1 (0.0)19 (0.8)25 (1.0)54 (2.1)37 (1.4)
Average precipitation days (≥ 1 mm)3461041001374

Monthly sunshine hours in Castro Marim, Portugal

The sunniest months in Castro Marim are May, June and July, when the sun shines an average of 13 hours 34 minutes a day. Least sunny months in Castro Marim: January, November and December receive an average of 7 hours 25 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Castro Marim. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours201245306356407413427399350322242238
Mean daily daylight hours9h 54m10h 49m11h 58m13h 10m14h 10m14h 39m14h 24m13h 31m12h 22m11h 11m10h 9m9h 38m

Solar UV radiation in Castro Marim, Portugal

Castro Marim experiences the highest level of ultraviolet (UV) radiation in May, June and August, 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 Castro Marim UV Index data.

Average daily maximum UV levels by month for Castro Marim. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)3579101110109743