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Cascais Weather in October
With daytime temperatures of 21°C (70°F) and nighttime lows of 17°C (63°F), October in Cascais brings pleasant temperatures during the day. Do keep in mind that quite a bit of rainfall is typical. Around 82 mm (3.2 in) falls on average.
Rainfall in Cascais in October
Historically, October sees about 11 days of rain, with a monthly average of 82 mm (3.2 in). When it rains this month, it tends to come down fairly heavily. Showers can be substantial even if they don't last all day.
Temperature in Cascais in October
Weather in Cascais is at its excellent in October. Highs reach 21°C (70°F), while nights settle around 17°C (63°F). Temperatures can feel cooler in the morning and evening, so layering is often the best approach. With overnight lows of 17°C (63°F), evenings can feel noticeably cooler than the daytime. An extra layer is a good idea, though the cool air makes for a good night's sleep.
Sunshine in Cascais in October
Expect a lot of sunshine this month, with about 233 hours of sun. These sunny conditions add to the overall experience.If you're inclined towards comfortable temperatures and drier conditions, October is a good time to visit Cascais.
Cascais Temperature in October
Min Temperature
17°C (63°F)
Max Temperature
21°C (70°F)
Chance of Rain
36%
Precipitation
82 mm (3.2 in)
Rainy days
11 days
Humidity
76%
Sunshine
233 hours
Percentage Sunshine
68%
Cascais Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Cascais - and find the best time to visit.
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Cascais typically drop from around 24°C (75°F) at the start of October to approximately 20°C (68°F) by the end. Nights are pleasant, with lows typically ranging from 13°C (55°F) to 16°C (61°F).
Average temperatures in October
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in October
Historical weather records for Cascais in October
Browse day-by-day weather records for Cascais spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Cascais historical weather extremes in October
According to our 49 years of weather records for Cascais, the following extremes were recorded between 1976 and 2025.
- On October 18, 1995, temperatures climbed to 36°C (97°F), marking the warmest October day on record.
- The coldest October day was on October 31, 2018, with a maximum of 11°C (52°F).
- The coldest night in October in Cascais was on October 20, 1998, with a minimum of 7°C (45°F).
Best Places in Portugal in October
Find out more about the weather in Portugal and which places have the best travel conditions in this month. See all of Portugal in October →
perfect weather
pleasant
tolerable
unpleasant
poor
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).
What to Wear in Cascais in October
Pleasant temperatures in October mean you can pack light but flexibel pieces. Think cotton t-shirts, comfortable walking shorts, and one warmer layer for evenings. A light sweater or denim jacket works well. Prepare for significant rainfall with proper waterproof clothing and shoes. Don't forget sun protection, sunglasses, sunscreen, and a hat. These are all good ideas with this much sunshine.
What To Do in Cascais in October
We rated the following activities from 1 (least suitable) to 10 (best) to do.
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Cycling9/10 -
Walking9/10 -
Barbeque8/10 -
Camping8/10 -
Outdoor sports9/10
Cascais 3-Day Forecast
More climate data for Cascais
Temperature Rainfall Sunshine Humidity
See the full Cascais climate overview or explore weather in Portugal.
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Where to go in October - average daytime high across popular destinations.
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