Climate in Alentejo

Average daytime and nighttime temperatures

All climate diagrams on this site result from the collected data from five measuring weather stations in Alentejo.
All data correspond to the average monthly values of the last 20 years.

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Alentejo is one of the warmest regions in Portugal with an average daily high temperature of 23 degrees. For 6 months, the average temperatures are over 25 degrees. Pleasant water temperatures of up to 19 degrees even invite you to bathe in the warm season. Due to the warmer temperatures, the best time for traveling is from July to August. Less attractive are the cold months from November to March.
Overview: Climate in Portugal
Daylengths and sun positions in Portugal
Compare climate with other regions or countries
Sunshine hours per day
The number of hours of sunshine refers to the time when the sun is actually visible. That is, without any obstruction of visibility by clouds, fog or mountains. With 12 hours per day, July is the sunniest month in the region of Alentejo. In December, the sun shines the least.
Rain days per month
A rain day is a day on which at least 0.1 mm precipitation (=0.1 liter) per square meter falls. This can be rain, snow, hail or even dew. So it does not have to rain the whole day. With 8 rain days, November offers the most rain days, while July has the fewest.
Precipitation amount in mm/day
The amount of precipitation is measured in millimeters per square meter. Thus, at two mm/day, two liters of water fall on one square meter within 24 hours. With only 0.1 mm, the least amount of rain falls in July. October, on the other hand, has the most rain.
Water temperatures in °C
Water temperature depends not only on solar radiation within the same region, but also on ocean currents. For example, depending on the season, cold or warm water masses are moved from other areas. The warmest water temperatures in Alentejo are in August, when the water is 19 °C.
Relative humidity in %
Warm air can absorb more moisture than cold air. The relative humidity indicates how much moisture can be physically contained in the air. At high humidity, a person feels uncomfortable and perceives this as oppressive. In general, a relative humidity of 40-60% feels pleasant. With humidity averaging 81%, December is the most uncomfortable. In August, on the other hand, it is easier to endure.
Absolute humidity in g/m³
In warm months, there is also a higher absolute humidity almost everywhere. At a temperature of 25°C, air can absorb up to 23 grams of water per cubic meter. At 20°C, it is only 17.3 grams. A relative humidity of 40% at 25°C thus corresponds to an absolute humidity of 9.2 grams of water. From a proportion of approx. 13.5 grams, humans perceive the air as muggy. This limit is reached for 4 months in Alentejo, although these are average values, and a month is rarely completely or not at all humid.
The "Humidex" (humidity index) is an index of well-being in warmer areas, calculated from the air temperature, relative humidity and dew point. The index corresponds approximately to the temperature felt. At high temperatures, the body transports heat away by sweating. At high humidity, the ambient air can only absorb a small amount of sweat and thus one feels uncomfortable. An index of 20-29 is considered comfortable. Up to 39, people perceive the air as slightly uncomfortable, and above 40, as very uncomfortable. Values above 45 are dangerous in the long run and often lead to heat stroke.
Climate charts for other regions in Portugal

Map of Alentejo

Most important cities in the region »Alentejo«

The region has a west-east extension of about 160 km and over 240 km from north to south.

It consists of the four regions Beja, Portalegre, Santarém and Évora.

CityPopulationGeo position
Évora55,62038° 34' 0"N7° 54' 0"W
Monsanto50,00039° 27' 43"N8° 42' 42"W
Beja34,76038° 0' 54"N7° 51' 48"W
Santarém29,38539° 13' 60"N8° 40' 60"W
Entroncamento19,88739° 28' 0"N8° 28' 0"W
Tomar19,16839° 36' 7"N8° 24' 33"W
Portalegre15,58139° 17' 38"N7° 25' 52"W
Torres Novas14,52639° 28' 52"N8° 32' 22"W
Samora Correia14,15438° 56' 14"N8° 52' 18"W
Abrantes13,64639° 28' 0"N8° 11' 60"W
Montemor-o-Novo12,85438° 38' 53"N8° 12' 52"W
Ourém12,72939° 38' 30"N8° 35' 31"W
Rio Maior12,06439° 20' 14"N8° 56' 21"W
Fátima11,79839° 37' 15"N8° 39' 9"W
Almeirim11,55739° 12' 33"N8° 36' 59"W
Vendas Novas11,24838° 40' 37"N8° 27' 29"W
Santo André11,21339° 3' 19"N8° 14' 39"W
Ponte de Sôr11,06239° 14' 59"N8° 0' 36"W
Vale da Amoreira10,82839° 4' 11"N7° 41' 55"W
Cartaxo10,50239° 9' 37"N8° 47' 15"W
Elvas9,90438° 52' 53"N7° 9' 46"W
Moura9,36038° 8' 24"N7° 26' 55"W
Estremoz9,35038° 50' 40"N7° 35' 9"W
Benavente8,93238° 58' 45"N8° 48' 27"W
Coruche8,77638° 57' 34"N8° 31' 31"W
Campo Maior8,23539° 1' 4"N7° 3' 54"W
Alpiarça7,94639° 15' 26"N8° 34' 55"W
Reguengos de Monsaraz7,21738° 25' 31"N7° 32' 6"W
Fazendas de Almeirim6,63539° 10' 32"N8° 34' 9"W
Serpa6,58637° 56' 45"N7° 35' 51"W

Data basis: German Weather Service, individual values averaged and supplemented by own elements. Data on cities and inhabitants:, United Nations Statistics Division and own research.
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