Month guide · Sines, Portugal
Sines in August: weather and what to expect
In August, Sines averages highs of 26°C and lows of 18°C, with about 1 rainy day and 4 mm of rain. Highs are about the same as in July and 2°C warmer than in September. Our rules rate it good for beach days, walking and cycling. Crowds in the Alentejo are at their peak.
Is August a good time to visit?
Good for
- Beach daysHighs of 26°C and about 1 rainy day
- Walking and cyclingHighs of 26°C with about 1 rainy day
Not ideal for
Nothing stands out as a weaker fit.
Daily highs through August
Town-level · ERA5-Land 1991-2020Highs stay about the same through the month.
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 →| Place | High | Rain days | From Sines |
|---|---|---|---|
| Ferreira do Alentejo, Alentejo | 32°C | 1 | 67 km |
| Beringel, Alentejo | 32°C | 1 | 78 km |
| Aljustrel, Alentejo | 32°C | 1 | 62 km |
| Ermidas, Alentejo | 32°C | 1 | 43 km |
| Castro Verde, Alentejo | 32°C | 1 | 75 km |
The nearest towns with a warmer August. Distances are in a straight line.
How August is changing
Town-level · ERA5-LandAugust highs are 0.9°C warmer than in 1991-2000, and August rainfall is down about 75% (2016-2025 against 1991-2000). Days above 30°C in August went from 1.9 to 2.9 a year on average.
Questions about Sines in August
Is August a good time to visit Sines?
Our rules rate August good for beach days (highs of 26°C and about 1 rainy day); walking and cycling (highs of 26°C with about 1 rainy day).
How warm is Sines in August?
Average highs are 26°C and lows 18°C. July averages 25°C and September 24°C.
Does it rain much in Sines in August?
About 1 day has at least 1 mm of rain, with 4 mm in total over the month.
Is Sines 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 Sines in August?
About 13 h 41 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