Measurements:
°C
°F
CURRENT WEATHER
23:52
Cascais
70°F
SE 13 mph
Feels like: 70°F
Precip: 27%
World Resorts Portugal Cascais Weather

7 Day Weather Forecast

09.08
tue
DAY
70°F
S 16 mph
precip
27%
NIGHT
70°F
SE 13 mph
precip
27%
09.09
wed
DAY
68°F
S 21 mph
precip
7%
NIGHT
68°F
S 24 mph
precip
15%
09.10
thu
DAY
70°F
S 19 mph
precip
8%
NIGHT
68°F
S 22 mph
precip
11%
09.11
fri
DAY
72°F
S 13 mph
precip
7%
NIGHT
68°F
S 18 mph
precip
14%
09.12
sat
DAY
74°F
S 10 mph
precip
8%
NIGHT
74°F
S 15 mph
precip
5%
09.13
sun
DAY
80°F
SW 1 mph
precip
2%
NIGHT
74°F
S 11 mph
precip
4%
09.14
mon
DAY
76°F
N 9 mph
precip
4%
NIGHT
74°F
SE 6 mph
precip
13%

Cascais Sea Water Temperature in September, °F

Select Year: 2025 2024 2023

The average sea surface temperature in September 2025 for Cascais was 17.0°F. The maximum and minimum values were 15.7°F and 18.6°F respectively.

Cascais on the Weather Map

Best Time to Visit Cascais
The most sunny months:
August 27 days
July 26 days
September 23 days
The most warm months:
August 79.2 °F
July 77.9 °F
September 77.6 °F
Warmest sea temperature:
September 66.3 °F
October 65.9 °F
August 65.6 °F
The most cold months:
January 60.0 °F
February 60.3 °F
March 62.2 °F
The most rainy months:
November 5 days
March 4 days
December 4 days
The most windy months:
July 14 mph
August 13 mph
June 13 mph
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