Rain returned this weekend and is expected to continue in some regions of mainland Portugal throughout the week, particularly in the North and Center, with temperatures set to rise only from Thursday onward, according to the forecast from the Portuguese Institute for Sea and Atmosphere (IPMA).
The IPMA stated that between September 8 and 14, “the weather will be influenced by the position of the Azores anticyclone.” At the beginning of the week, “the anticyclone is located west of the Azores archipelago, allowing weak frontal systems to pass, leaving precipitation to the north of the Montejunto Estrela system, with low probability of reaching the Alentejo.”
Throughout the week, “the anticyclone will move eastwards and extend into the Bay of Biscay, creating a flow from the north quadrant, temporarily east, over the mainland, blocking the passage of new systems and bringing a rise in temperatures.”
Despite this, on a weekly basis, “the average temperature will still be below what is usual for this time of year,” notes the IPMA.
Thus, “from Thursday, the 11th, temperatures are expected to rise” with maximum temperatures ranging between 24°C and 32°C in the interior North and Center regions. In the South region, it will vary between 28°C and 34°C, and in coastal areas, maximum temperatures will range between 22°C and 31°C.
Meanwhile, the minimum temperature is expected to be between 9°C and 14°C in the interior North and Center regions and between 13°C and 15°C in the South region. In coastal areas, values should range between 14°C and 19°C.
The IPMA also mentioned that in the coming days “the trend is for continued passage of frontal undulations over the North and Center regions, where occasional precipitation is expected until the end of the week.”
Portugal Records Hottest Summer in 94 Years in 2025
Last week, the IPMA revealed that Portugal experienced the hottest summer in 94 years in 2025, marked by three heat waves, with the average temperature being 1.55°C above normal.
According to the preliminary analysis from IPMA, the highest values of average and maximum temperatures since 1931 were recorded, in a year described as “extremely hot and extremely dry.”
“It was the hottest summer since 1931, with an average air temperature of 23.51°C, 1.55°C above the normal value (1991-2020),” indicated the IPMA.
There was also an average maximum air temperature of 30.78°C, the highest in the last nine decades, “with an anomaly of 2.09°C compared to the normal value.”
The average minimum air temperature was 16.25°C – the fourth highest since 1931 – with an increase of 1.02°C compared to normal. The highest was recorded in 1989 (16.31°C).
The three heat waves occurred between June 15 and 20, June 26 and July 9, and July 29 to August 17, the longest in the interior North and Center regions.
There were also 33 new extremes of maximum air temperature and 10 new extremes of minimum air temperature recorded.
The extreme value recorded in Mora (46.6°C) on June 29 corresponds to the new absolute maximum temperature for that month in mainland Portugal.
This summer was also the driest since 1931, with a total precipitation of 10.9 mm, corresponding to only 24% of the normal value for 1991-2020.
