Month guide · Sines, Portugal
Sines in May: weather and what to expect
In May, Sines averages highs of 21°C and lows of 14°C, with about 7 rainy days and 39 mm of rain. Highs are 2°C warmer than in April and 3°C cooler than in June. Our rules rate it good for walking and cycling. Crowds in the Alentejo are low.
Is May a good time to visit?
Good for
- Walking and cyclingHighs of 21°C with about 7 rainy days
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.
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 Sines |
|---|---|---|---|
| Ferreira do Alentejo, Alentejo | 24°C | 7 | 67 km |
| Ermidas, Alentejo | 24°C | 7 | 43 km |
| Aljustrel, Alentejo | 24°C | 7 | 62 km |
| Odemira, Alentejo | 23°C | 7 | 45 km |
| Alcácer do Sal, Alentejo | 23°C | 7 | 56 km |
The nearest towns with a warmer May. Distances are in a straight line.
How May is changing
Town-level · ERA5-LandMay highs are 1.4°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 2.3 to 4.5 a year on average.
Questions about Sines in May
Is May a good time to visit Sines?
Our rules rate May good for walking and cycling (highs of 21°C with about 7 rainy days).
How warm is Sines in May?
Average highs are 21°C and lows 14°C. April averages 19°C and June 24°C.
Does it rain much in Sines in May?
About 7 days have at least 1 mm of rain, with 39 mm in total over the month.
Is Sines 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 Sines in May?
About 14 h 12 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