The temperatures in Cascais in August are comfortable with low of 18°C and and high up to 28°C.
There shouldn't be any rainy days in in Cascais during August. Having said that, the days are very hot in August so hanging out outside is more recomanded during the after noons and evening time.
Our weather forecast can give you a great sense of what weather to expect in Cascais in August 2025.
If you’re planning to visit Cascais in the near future, we highly recommend that you review the 14 day weather forecast for Cascais before you arrive.
Temperatures
28° / 18°
Rainy Days
0
Snowy Days
0
Dry Days
31
Rainfall
3
mm
Sun Hours
11.8
Hrs
