Month guide · Cacém, Portugal
Cacém in May: weather and what to expect
In May, Cacém averages highs of 19°C and lows of 14°C, with about 7 rainy days and 48 mm of rain. Highs are 2°C warmer than in April and 3°C cooler than in June. Crowds in the Lisbon area are high.
Is May a good time to visit?
Good for
No verdicts for Cacém 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 3°C over the month. A day above 25°C happens in roughly 1 May in 2; nights below 10°C in about 1 in 5.
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 Cacém |
|---|---|---|---|
| Marinhais, Alentejo | 24°C | 8 | 60 km |
| Poceirão, Alentejo | 24°C | 7 | 44 km |
| Benavente, Alentejo | 24°C | 8 | 49 km |
| Salvaterra de Magos, Alentejo | 24°C | 8 | 52 km |
| Samora Correia, Alentejo | 23°C | 7 | 41 km |
The nearest towns with a warmer May. Distances are in a straight line.
How May is changing
Town-level · ERA5-LandMay highs are 1.1°C warmer than in 1991-2000, and May rainfall is down about 40% (2016-2025 against 1991-2000). Days above 20°C in May went from 7.9 to 15 a year on average.
Questions about Cacém in May
How warm is Cacém in May?
Average highs are 19°C and lows 14°C. April averages 17°C and June 22°C.
Does it rain much in Cacém in May?
About 7 days have at least 1 mm of rain, with 48 mm in total over the month.
Is Cacém busy in May?
In May 2025, nights booked through online platforms in the Lisbon area were about 75% of the busiest month, which we count as high. The figure is for the whole region and leaves out hotels.
How long are the days in Cacém in May?
About 14 h 15 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