Spring (March–May): Average 14.2–18.3°C, mild and comfortable climate. Rainfall decreases gradually from March to May, with plenty of sunshine. Popular activities: Coastal walks, outdoor picnics, visiting Cascais Old Town. Recommended clothing: Light jacket, long-sleeved shirts, comfortable shoes.
Summer (June–August): Average 19.7–21.8°C, hot and dry climate, especially in July and August with minimal rainfall. Popular activities: Swimming, sunbathing, water sports, exploring the nearby Sintra mountains. Recommended clothing: Light and breathable clothing, hat, sunglasses, sunscreen.
Autumn (September–November): Average 16.3–20.0°C, pleasant climate, but rainfall increases gradually, especially in October. Popular activities: Visiting Cascais beaches, enjoying local seafood, admiring the autumn scenery. Recommended clothing: Comfortable long-sleeved shirts, light jacket, warm clothing.
Winter (December–February): Average 12.8–13.6°C, mild climate, but with more rainfall, especially in December. Popular activities: Exploring Cascais indoor attractions, enjoying the warm atmosphere of cafes. Recommended clothing: Warm jacket, scarf, gloves.
Cascais climatological average
Annual average temperature: approx. 17.2°C / Annual rainfall: approx. 628 mm / Summer humidity: 60%–70% / Rainiest month: December
Cascais monthly average temperature and precipitation
Month
Air temperature (°C)
Precipitation (mm)
January
12.8°C
67.2
February
13.6°C
51.5
March
14.2°C
100.3
April
16.3°C
36.6
May
18.3°C
6
June
19.7°C
26
July
21.8°C
4.6
August
21.3°C
0.1
September
20°C
53.5
October
19.3°C
106.7
November
16.3°C
68.4
December
13.2°C
108
Cascais weather for the next seven days
10/21
Tuesday
Patchy rain nearby
21.7°C/19.3°C
10/22
Wednesday
Patchy rain nearby
21°C/19.4°C
10/23
Thursday
Cloudy
21.1°C/19.5°C
10/24
Friday
Partly Cloudy
20.8°C/19.3°C
10/25
Saturday
Moderate rain
19.1°C/17.5°C
10/26
Sunday
Moderate rain
17.9°C/17.1°C
10/27
Monday
Patchy rain nearby
21.6°C/17°C
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