Cascais at a glance
- Best time
- Jun – Sep
- Warmest month
- Aug · 26°
- Warmest sea
- Sep · 18.8°
- Sunshine a year
- 3,060 h
- Rain a year
- 565 mm
- Climate
- Mediterranean
- Time zone
- UTC+0 / UTC+1
- Elevation
- 20 m
Climate in Cascais
Cascais has a Mediterranean climate with warm to hot, dry summers and mild, wetter winters. August is the warmest month with average highs of 26 °C, while January is the coolest at 15 °C. With around 3,060 hours of sunshine a year, Cascais is very sunny; July is the sunniest month with 11.6 hours a day.
Weather in October
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. The sun shines for around 7 hours 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.
More details for October
- Daylight
- 11 h 16 min07:46 – 19:01
- UV index
- 4 · moderateclear sky, noon (estimate)
- 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 %70 %
- 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
Sea temperature in Cascais
Monthly sea surface temperature with the range of cooler and warmer years.
8 in 10 years: 17.3 – 19.5 °C
Swimming season: Never above 20 °C
- cold
- fresh
- refreshing
- pleasant
- warm
- very warm
The sea temperature in Cascais ranges from 14.8 °C in February to 18.8 °C in September. Even at its warmest the sea stays below 20 °C, so swimming is bracing at best.
The sea warms up slowly: it is warmest in September, while the air already peaks in August. From December to January the sea is even warmer than the afternoon air. The sea temperature varies from year to year: in September, eight out of ten years were between 18.0 and 19.7 °C.
| Month | Average | Cool year | Warm year | Feels |
|---|---|---|---|---|
| JanuaryJan | 15.4° | 14.8° | 16.2° | cold |
| FebruaryFeb | 14.8° | 13.9° | 15.5° | cold |
| MarchMar | 14.9° | 14.1° | 15.5° | cold |
| AprilApr | 15.7° | 14.9° | 16.8° | cold |
| MayMay | 16.5° | 15.5° | 17.4° | cold |
| JuneJun | 17.8° | 17.1° | 18.6° | fresh |
| JulyJul | 18.2° | 17.7° | 18.9° | fresh |
| AugustAug | 18.6° | 17.8° | 19.6° | fresh |
| SeptemberSep | 18.8° | 18.0° | 19.7° | fresh |
| OctoberOct | 18.5° | 17.3° | 19.5° | fresh |
| NovemberNov | 17.3° | 16.1° | 18.4° | fresh |
| DecemberDec | 16.1° | 15.4° | 16.8° | cold |
Sunshine hours in Cascais
Average hours of bright sunshine per day, next to the length of the day. Tap a month to select it.
In October, the sun shines for about 7.2 of 11.3 hours of daylight in Cascais, 64 % of the day.
Sunshine hours count the time with bright, direct sunshine (WMO definition, estimated from model data); daylight is the time from sunrise to sunset on the 15th of the month.
Rain in Cascais: rainy days and rainfall
A rainy day is a day with at least 1 mm of rain or snow; the amount is what falls in the whole month. Tap a month to select it.
In October, Cascais has about 9 rainy days with 75 mm of rain in total.
Climate through the year
Long-term monthly averages. Tap a month to see its details.
Temperatures through the year
Average daytime high, night-time low and sea temperature per month.
| Month | Score | Day | Night | Sea | Sun | Rain days | Rain mm |
|---|---|---|---|---|---|---|---|
| JanuaryJan | 22 | 15° | 10° | 15.4° | 6.0 h | 9 | 71 |
| FebruaryFeb | 28 | 15° | 10° | 14.8° | 6.8 h | 7 | 52 |
| MarchMar | 28 | 17° | 11° | 14.9° | 7.7 h | 9 | 62 |
| AprilApr | 32 | 18° | 13° | 15.7° | 8.6 h | 9 | 52 |
| MayMay | 48 | 21° | 14° | 16.5° | 9.7 h | 6 | 38 |
| JuneJun | 70 | 24° | 17° | 17.8° | 11.1 h | 2 | 11 |
| JulyJul | 79 | 26° | 18° | 18.2° | 11.6 h | 1 | 2 |
| AugustAug | 81 | 26° | 19° | 18.6° | 10.9 h | 1 | 4 |
| SeptemberSep | 78 | 25° | 18° | 18.8° | 9.3 h | 4 | 31 |
| OctoberOct | 47 | 22° | 16° | 18.5° | 7.2 h | 9 | 75 |
| NovemberNov | 22 | 17° | 13° | 17.3° | 6.0 h | 10 | 85 |
| DecemberDec | 21 | 15° | 11° | 16.1° | 5.7 h | 10 | 83 |
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, GeoNames (CC BY 4.0)
38.70° N, 9.42° W · 20 m · Europe/Lisbon
Best time to visit Cascais
The best time to visit Cascais is from June to September. The sea stays too cool for a classic beach holiday: even in September it only reaches 18.8 °C. For sightseeing, day trips and hiking, conditions are most comfortable from February to December. The wettest month is November with 85 mm of precipitation.
Find your perfect month
Tell us what you like and we rate every month in Cascais for you.
Your best months: July – August
Based on the climate averages; tap a month to see its details.
Which month for what?
Beach & swimming
No month
Sea from 21 °C, warm and mostly dry
Sightseeing & hiking
Feb – Dec
15–28 °C and not too much rain
Cascais month by month
The typical weather for every month at a glance.
22January15° · Sea 15° · 6 h
In January, Cascais is cool: daytime highs average 15 °C, and nights cool down to about 10 °C. The sea averages 15.4 °C – swimming is only for the hardy. Expect around 6 hours of sunshine a day. Rain is frequent, with about 9 rainy days and 71 mm in total. All in all, January is not an ideal month for a holiday in Cascais.
Cascais in January28February15° · Sea 15° · 7 h
In February, Cascais is cool: daytime highs average 15 °C, and nights cool down to about 10 °C. The sea averages 14.8 °C – swimming is only for the hardy. The sun shines for around 7 hours a day. Rain falls on about 7 days, adding up to 52 mm. All in all, February is not an ideal month for a holiday in Cascais.
Cascais in February28March17° · Sea 15° · 8 h
In March, Cascais is mild: daytime highs average 17 °C, and nights cool down to about 11 °C. The sea averages 14.9 °C – swimming is only for the hardy. The sun shines for around 8 hours a day. Rain is frequent, with about 9 rainy days and 62 mm in total. All in all, March is not an ideal month for a holiday in Cascais.
Cascais in March32April18° · Sea 16° · 9 h
In April, Cascais is mild: daytime highs average 18 °C, and nights cool down to about 13 °C. The sea averages 15.7 °C – swimming is only for the hardy. The sun shines for around 9 hours a day. Rain falls on about 9 days, adding up to 52 mm. All in all, April is not an ideal month for a holiday in Cascais.
Cascais in April48May21° · Sea 17° · 10 h
In May, Cascais is mild: daytime highs average 21 °C, and nights cool down to about 14 °C. The sea averages 16.5 °C – swimming is only for the hardy. With around 10 hours of sunshine a day, there is plenty of sun. Rain falls on about 6 days, adding up to 38 mm. All in all, May is a so-so month for a holiday in Cascais.
Cascais in May70June24° · Sea 18° · 11 h
In June, Cascais is warm: daytime highs average 24 °C, and nights cool down to about 17 °C. The sea averages 17.8 °C – bracing, so a wetsuit helps for longer swims. With around 11 hours of sunshine a day, there is plenty of sun. Rain is rare: about 2 days bring 11 mm in total. All in all, June is a good month for a holiday in Cascais.
Cascais in June79July26° · Sea 18° · 12 h
In July, Cascais is warm: daytime highs average 26 °C, and nights cool down to about 18 °C. The sea averages 18.2 °C – bracing, so a wetsuit helps for longer swims. With around 12 hours of sunshine a day, there is plenty of sun. It hardly ever rains. All in all, July is a good month for a holiday in Cascais.
Cascais in July81August26° · Sea 19° · 11 h
In August, Cascais is warm: daytime highs average 26 °C, and nights cool down to about 19 °C. The sea averages 18.6 °C – bracing, so a wetsuit helps for longer swims. With around 11 hours of sunshine a day, there is plenty of sun. It hardly ever rains. All in all, August is an excellent month for a holiday in Cascais.
Cascais in August78September25° · Sea 19° · 9 h
In September, Cascais is warm: daytime highs average 25 °C, and nights cool down to about 18 °C. The sea averages 18.8 °C – bracing, so a wetsuit helps for longer swims. With around 9 hours of sunshine a day, there is plenty of sun. Rain is rare: about 4 days bring 31 mm in total. All in all, September is a good month for a holiday in Cascais.
Cascais in September47October22° · Sea 19° · 7 h
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. The sun shines for around 7 hours 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.
Cascais in October22November17° · Sea 17° · 6 h
In November, Cascais is mild: daytime highs average 17 °C, and nights cool down to about 13 °C. The sea averages 17.3 °C – bracing, so a wetsuit helps for longer swims. Expect around 6 hours of sunshine a day. Rain is frequent, with about 10 rainy days and 85 mm in total. All in all, November is not an ideal month for a holiday in Cascais.
Cascais in November21December15° · Sea 16° · 6 h
In December, Cascais is cool: daytime highs average 15 °C, and nights cool down to about 11 °C. The sea averages 16.1 °C – swimming is only for the hardy. Expect around 6 hours of sunshine a day. Rain is frequent, with about 10 rainy days and 83 mm in total. All in all, December is not an ideal month for a holiday in Cascais.
Cascais in DecemberPlanning a trip to Cascais
Getting there
Flying from
- Nonstop flight
- about 2 h 25 min
- Distance
- 1,580 km
- Time zone
- UTC+1
Estimated from the straight-line distance: 30 minutes for take-off and landing plus 830 km/h cruising speed.
Frequently asked questions about Cascais
When is the best time to visit Cascais?
The best time to visit Cascais is from June to September. That is when the holiday weather score, which combines temperature, sea, sunshine and rain, is highest.
How warm is the sea in Cascais?
The sea temperature in Cascais ranges from 14.8 °C in February to 18.8 °C in September. Even at its warmest the sea stays below 20 °C, so swimming is bracing at best.
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.
What is the warmest month in Cascais?
August is the warmest month, with average highs of 26 °C and nights around 19 °C. January is the coolest month at 15 °C.
When does it rain most in Cascais?
The wettest month is November with 85 mm of precipitation. The driest month is July with 2 mm.
How many hours of sunshine does Cascais get?
Cascais gets around 3,060 hours of sunshine a year. The sunniest month is July with 11.6 hours a day; in December there are 5.7 hours a day.
What time zone is Cascais in?
Cascais uses the time zone Europe/Lisbon: UTC+0 in January and UTC+1 in July.
How long is the flight from London to Cascais?
A nonstop flight from London to Cascais takes about 2 h 25 min, for a straight-line distance of about 1,580 km.
Near Cascais
Other destinations close by.