SeasonMapCascais weather in October
Portugal
October in Cascais: nice, a little rain, with clean air — a great time to visit.
#6 of 12 months in Cascais · #557 of 1383 destinations to visit in October · comfort 79/100 (tier B)
Updated September 2026 · climate normals from ERA5 reanalysis
Traveller notes on Cascais in October
Other months in Cascais
Cascais's forum calls July hot and sunny but not especially humid, typically mid-20s to low-30s°C with a regular Atlantic breeze that helps take the edge off. Regulars flag the sea itself as genuinely cold year-round despite the warm air, and note evenings can turn cool enough for a light jacket even after a hot day.
Add your own note from Cascais's card on the map.
Cascais climate normals — October
| Daytime high | 23°C / 73°F | 😎 nice |
|---|---|---|
| Nighttime low | 17°C / 62°F | |
| Feels like (high) | 22°C / 72°F | |
| Sea temperature | 20°C / 67°F | 🌊 fresh |
| Rainfall | 59 mm / 2.3 in | 🌦 some rain |
| Rainy days | 8 days | |
| Humidity | 79% | 💦 very humid |
| Dew point | 14°C / 58°F | |
| Sunshine | 8.9 h/day | |
| Daylight | 11.2 h | |
| Wind | 21 km/h / 13 mph | |
| Air quality (US AQI) | 48 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Crowds in Cascais in October
How busy the place itself is — school and mass holidays, the months an editor tagged, and how sought-after the weather makes them. Never part of the comfort score.
Shoulder seasonschool holidays in 4 of the markets that fill it, an ordinary month(estimated)
Peak crowdsBusyShoulder seasonQuiet
Best months for Cascais's weather
Ranked by this destination's own climate comfort score across the year — a different thing from how busy it gets (see Crowds above).
Fair weatherCascais's best weather comes in June, July and September — separate windows, not one continuous season.
Best weatherFair weatherToughest weather
What's on in Cascais in October
Recurring seasonal events, natural spectacles, closures and holidays — curated and sourced.
- Season
Sea at its warmest
20 Jul – 5 Oct · usuallySea warm enoughThe Atlantic upwelling keeps this coast cold well into summer and it only comes round in August and September. The bay beaches are always a little warmer than Guincho.
- Season
Winter swell season
1 Oct – 31 MarSurf seasonThe Atlantic lows that make winter here grey are the same ones that make it the serious surf half of the year, at Guincho and around the point at Carcavelos.
Nearby, and something's on
Within 300 km of Cascais — a day trip or a short hop — with something on this month. Never part of the comfort score.
Where is Cascais?
Cascais in October — FAQ
- Is October a good time to visit Cascais?
- October in Cascais: nice, a little rain, with clean air — a great time to visit. It ranks #6 of 12 months for Cascais on SeasonMap's comfort score (79/100).
- What is the weather like in Cascais in October?
- In October, Cascais averages a daily high of 22.5°C and a low of 16.6°C, with about 58.5 mm of rain over roughly 7.9 rainy days.
- What is the air quality in Cascais in October?
- Cascais has a mean US Air Quality Index of about 48 in October.
Other months in Cascais
Compare Cascais in October
Warmer or cooler than Cascais in October
Similar destinations in Southern Europe — October
Within 300 km: Lisbon's Grape harvest around 1 Sep – 15 Oct, and Évora's Alentejo grape harvest around 15 Aug – 5 Oct.