Spring (March–May): Average 57–64°F, 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 67–71°F, 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 61–68°F, 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 55–56°F, 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. 63.0°F / Annual rainfall: approx. 628 mm / Summer humidity: 60%–70% / Rainiest month: December
Cascais monthly average temperature and precipitation
Month
Air temperature (°F)
Precipitation (mm)
January
55°F
67.2
February
56.5°F
51.5
March
57.6°F
100.3
April
61.3°F
36.6
May
64.9°F
6
June
67.5°F
26
July
71.2°F
4.6
August
70.3°F
0.1
September
68°F
53.5
October
66.7°F
106.7
November
61.3°F
68.4
December
55.8°F
108
Cascais weather for the next seven days
10/22
Wednesday
Patchy rain nearby
69.4°F/66.8°F
10/23
Thursday
Partly Cloudy
69°F/63.9°F
10/24
Friday
Partly Cloudy
69.4°F/63.9°F
10/25
Saturday
Moderate rain
69°F/64.2°F
10/26
Sunday
Patchy rain nearby
63.8°F/60.5°F
10/27
Monday
Sunny
65.5°F/57.9°F
10/28
Tuesday
Sunny
68.5°F/57.4°F
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