Month guide · Castro Marim, Portugal
Castro Marim in August: weather and what to expect
In August, Castro Marim averages highs of 33°C and lows of 21°C, with almost no rainy days and 3 mm of rain. Highs are about the same as in July and 4°C warmer than in September. Our rules rate it good for beach days. Crowds in the Algarve are at their peak.
Is August a good time to visit?
Good for
- Beach daysHighs of 33°C and almost no rainy days
Not ideal for
- Outdoor activity at middayAverage highs of 33°C
Daily highs through August
Town-level · ERA5-Land 1991-2020Highs fall about 2°C over 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 Castro Marim |
|---|---|---|---|
| Mértola, Alentejo | 34°C | 1 | 51 km |
| Minas de São Domingos, Alentejo | 33°C | 1 | 51 km |
| Serpa, Alentejo | 33°C | 1 | 82 km |
| Aldeia Nova, Alentejo | 33°C | 1 | 78 km |
| Cabeça Gorda, Alentejo | 33°C | 1 | 84 km |
The nearest towns with a warmer August. Distances are in a straight line.
How August is changing
Town-level · ERA5-LandAugust highs are 2.2°C warmer than in 1991-2000 (2016-2025 against 1991-2000). Days above 35°C in August went from 3.9 to 11 a year on average.
Questions about Castro Marim in August
Is August a good time to visit Castro Marim?
Our rules rate August good for beach days (highs of 33°C and almost no rainy days). It is less suited to outdoor activity at midday (average highs of 33°C).
How warm is Castro Marim in August?
Average highs are 33°C and lows 21°C. July averages 33°C and September 29°C.
Does it rain much in Castro Marim in August?
Hardly any days have at least 1 mm of rain, with 3 mm in total over the month.
Is Castro Marim busy in August?
In August 2025, nights booked through online platforms in the Algarve 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 Castro Marim in August?
About 13 h 38 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