Month guide · Alcácer do Sal, Portugal
Alcácer do Sal in May: weather and what to expect
In May, Alcácer do Sal averages highs of 23°C and lows of 13°C, with about 7 rainy days and 44 mm of rain. Highs are 3°C warmer than in April and 4°C cooler than in June. Crowds in the Alentejo are low.
Is May a good time to visit?
Good for
No verdicts for Alcácer do Sal in May yet. They only use climate values that are precise enough to judge with.
Not ideal for
Nothing stands out as a weaker fit.
Daily highs through May
Town-level · ERA5-Land 1991-2020Highs climb about 5°C over the month.
May in detail
Town-level · ERA5-LandCrowds, holidays and daylight
Public holidays in May 2027
- 1 May Labor Day
- 27 May Corpus Christi
Local (municipal) holidays are not included.
Warmer in May
Where is warm in May →| Place | High | Rain days | From Alcácer do Sal |
|---|---|---|---|
| Ferreira do Alentejo, Alentejo | 24°C | 7 | 49 km |
| Ermidas, Alentejo | 24°C | 7 | 43 km |
| Vendas Novas, Alentejo | 24°C | 8 | 34 km |
| Montemor-o-Novo, Alentejo | 24°C | 8 | 40 km |
| Alvito, Alentejo | 24°C | 8 | 47 km |
The nearest towns with a warmer May. Distances are in a straight line.
How May is changing
Town-level · ERA5-LandMay highs are 2.2°C warmer than in 1991-2000, and May rainfall is down about 40% (2016-2025 against 1991-2000). Days above 25°C in May went from 7.1 to 14 a year on average.
Questions about Alcácer do Sal in May
How warm is Alcácer do Sal in May?
Average highs are 23°C and lows 13°C. April averages 20°C and June 27°C.
Does it rain much in Alcácer do Sal in May?
About 7 days have at least 1 mm of rain, with 44 mm in total over the month.
Is Alcácer do Sal busy in May?
In May 2025, nights booked through online platforms in the Alentejo were about 30% of the busiest month, which we count as low. The figure is for the whole region and leaves out hotels.
How long are the days in Alcácer do Sal in May?
About 14 h 14 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