Month guide · Mértola, Portugal
Mértola in August: weather and what to expect
In August, Mértola is the warmest town in Portugal. August highs in Mértola are now 2.3°C warmer than in 1991-2000. In August, Mértola averages highs of 34°C and lows of 20°C, with about 1 rainy day and 5 mm of rain. Crowds in the Alentejo are at their peak.
Is August a good time to visit?
Good for
No verdicts for Mértola in August yet. They only use climate values that are precise enough to judge with.
Not ideal for
- Outdoor activity at middayAverage highs of 34°C
Daily highs through August
Town-level · ERA5-Land 1991-2020Highs fall about 2°C over the month. A day above 40°C happens in roughly 1 August in 3.
August in detail
Town-level · ERA5-LandCrowds, holidays and daylight
Public holidays in August 2027
- 15 Aug Assumption Day
Local (municipal) holidays are not included.
Warmer in August
Where is warm in August →No town in Portugal with precise enough data has a warmer average August high than Mértola.
How August is changing
Town-level · ERA5-LandAugust highs are 2.3°C warmer than in 1991-2000, and August rainfall is down about 85% (2016-2025 against 1991-2000).
Questions about Mértola in August
Is August a good time to visit Mértola?
It is less suited to outdoor activity at midday (average highs of 34°C).
How warm is Mértola in August?
Average highs are 34°C and lows 20°C. July averages 34°C and September 30°C.
Does it rain much in Mértola in August?
About 1 day has at least 1 mm of rain, with 5 mm in total over the month.
Is Mértola busy in August?
In August 2025, nights booked through online platforms in the Alentejo were the busiest month of the year, which we count as peak. The figure is for the whole region and leaves out hotels.
How long are the days in Mértola in August?
About 13 h 40 min from sunrise to sunset in the middle of the month.
Sources
Climate: ERA5-Land, Copernicus Climate Change Service (C3S) Climate Data Store, contains modified Copernicus information (CC BY 4.0). Crowds: Eurostat, nights spent in short-stay accommodation booked through online platforms (tour_ce_omn12) (CC BY 4.0). Place names and populations: GeoNames (CC BY 4.0). Climate averages cover 1991-2020. Daylight: calculated from the town's coordinates. Full methodology