Cascais weather in October
Temperature, sea and sunshine in October: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in October
Fair
Best time to visit: June – September
What is the weather like in Cascais in October?
In October, Cascais is warm: daytime highs average 22 °C, and nights cool down to about 16 °C. The sea averages 18.5 °C – bracing, so a wetsuit helps for longer swims. Expect around 6 hours of sunshine a day. Rain is frequent, with about 9 rainy days and 75 mm in total. All in all, October is a so-so month for a holiday in Cascais.
October compared
How the weather changes from September to November. Tap a month to open it.
| SeptemberSep | OctoberOct | NovemberNov | |
|---|---|---|---|
| Score | 76 | 44 | 19 |
| Day | 25° | 22° | 17° |
| Night | 18° | 16° | 13° |
| Sea | 19° | 19° | 17° |
| Sun | 8 h | 6 h | 5 h |
| Rain days | 4 | 9 | 10 |
More details for October
- Daylight
- 11 h 16 min07:46 – 19:01
- UV index
- 4 · moderateclear sky, noon (estimate)All months
- Muggy days
- 2 daysdew point 18 °C or more
- Wind
- 22 km/haverage daily peak
- Cloud cover
- 51 %on average
- Hot days
- 0 days30 °C or more
- Time zone
- UTC+1Europe/Lisbon
How the score comes together
- Temperatureweight 35 %43 %
- Seaweight 25 %21 %
- Sunshineweight 20 %55 %
- Few rainy daysweight 20 %64 %
Each factor is rated from 0 to 100 % and weighted for the travel style “Sun, sea & sand”.
What to pack in October
- Wetsuit for longer swims
- Sunscreen
- Rain jacket or umbrella
Cascais in October: quick answers
Is Cascais hot in October?
Warm rather than hot: in October, daytime highs in Cascais average 22 °C and nights cool to about 16 °C.
Can you swim in Cascais in October?
Only if you don't mind cold water: in October the sea averages just 18.5 °C. Comfortable swimming temperatures are not reached at any time of year.
Does it rain much in Cascais in October?
Rain is frequent, with about 9 rainy days and 75 mm in total.
Cascais month by month
The whole year in CascaisAll destinations: PortugalWhere to go in OctoberSea temperature in October
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0)