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The climate in Portugal

Average daytime and nighttime temperatures

All climate diagrams on this page result from the collected data of 22 weather stations.
Weather stations at an altitude above 690m have not been included.
All data correspond to the average monthly values of the last 20 years.
Back to overview: Portugal
Climate zone: The northern part of Portugal is located in the temperate climatic zone, while the southern part is subtropical.
A beach holiday can also be enjoyed in the warmer season, but water temperatures will not reach much more than 20 °C. The warmest and at the same time rainiest region is Alentejo. The coldest is North.
Duration of daylight and sunshine in Portugal
Compare climate with other regions or countries
Hours of sunshine per daySunshine hours per day in Portugal
Rainy days per monthRainy days per month in Portugal
Precipitation in mm/dayPrecipitation in Portugal
Water temperatureWater temperatures in Portugal
Relative humidity in %Relative humidity in Portugal
Absolute humidity in g/m³Absolute humidity in Portugal

Regions in Portugal

All figures per year. For detailed climate data click on the name of the region.
RegionTemperature
max Ø day
Temperature
min Ø night
Sunshine
hours
Rainy
days
PrecipitationHumidity
Alentejo23.0 °C11.6 °C2,884 h60 591 l72.0 %
Algarve21.9 °C13.8 °C3,212 h43 493 l72.0 %
Azores20.4 °C15.4 °C1,935 h118 989 l78.0 %
Lisbon21.5 °C13.7 °C2,884 h72 756 l72.0 %
Madeira22.4 °C16.8 °C2,373 h55 507 l71.0 %
North19.6 °C9.3 °C2,336 h106 1,208 l77.0 %
Center21.0 °C10.9 °C2,701 h76 821 l77.0 %

Temperature records of the last 73 years

The hottest temperature measured from 1949 to September 2022 was reported by the Evora Airp weather station. In July 2022 the record temperature of 44.2 °C was reported here. The hottest summer from July to September, based on all 21 weather stations in Portugal below 690 metres altitude, was recorded in 1990 with an average temperature of 23.4 °C. This average temperature will normally be measured every 4 to 6 hours, thus also including the nights. Normally, this value is 22.0 degrees Celsius.
The coldest day in these 73 years was reported by the weather station Evora Airp. Here the temperature dropped to -0.1 °C in January 2019. Evora Airp lies at an altitude of 246 meters above sea level. The coldest winter (January to March) was in 1972 with an average temperature of 12.3 °C. In Portugal, it is usual to have about 1.3 degrees more at 13.6 °C for this three-month period.
The most precipitation fell in December 1978. With 20.1 mm per day, the Porto Pedras Rubras weather station recorded the highest monthly average of the last 73 years. Incidentally, the region with the most rainfall for the whole year is around Flores Acores. The driest region is near Porto Santo Airp.

Long-term development of temperatures from 1997 - 2021

In contrast to single record values, a long-term development cannot simply be brought about by all weather stations in the country. Both the number and the locations are constantly changing. A simply calculated average value would give a falsified result. If several measuring stations in particularly cold mountain or coastal regions are added in one year, the average would already decrease as a result of this alone. If a station fails during the summer or winter months, it does not provide any values and falsifies the average again. The subsequent long-term development was therefore reduced to only 1 measuring points in order to have actually comparable data over as long a period as possible.
In the years 1997 to 2021 there were only these 1 weather stations in the whole country, which reported continuous temperature values (Castelo Branco). From these weather reports we have created a long-term development that shows the monthly average temperatures. The hottest month in this entire period was August 2018 with 28.0 °C. January 2000 was the coldest month with an average temperature of 5.9 °C.
The average annual temperature was about 15.6 °C in the years after 1997 and about 16.3 °C in the last years before 2021. It has therefore increased only slightly by about 0.7 °C over the past 25 years. This trend only applies to the selected 1 weather stations in Portugal. A considerably more comprehensive evaluation of the global warming has been provided separately.
Long-term development of temperatures in Portugal

Data basis and methodology

The data of the individual measuring stations are based on the archives of the German Weather Service, individual values averaged and supplemented by own elements. In order to determine a representative national average, average values were first calculated for each part of the country, which were then summarized at the national level. Thus, if a disproportionate number of weather stations are located in a small area, their number does not affect the national average.
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