Cascais weather in April
Temperature, sea and sunshine in April: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in April
Poor
Best time to visit: June – September
What is the weather like in Cascais in April?
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 8 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.
April compared
How the weather changes from March to May. Tap a month to open it.
More details for April
- Daylight
- 13 h 10 min07:03 – 20:13
- UV index
- 8 · very highclear sky, noon (estimate)All months
- Muggy days
- 0 daysdew point 18 °C or more
- Wind
- 23 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 %0 %
- Seaweight 25 %0 %
- Sunshineweight 20 %80 %
- Few rainy daysweight 20 %66 %
Each factor is rated from 0 to 100 % and weighted for the travel style “Sun, sea & sand”.
What to pack in April
- Sunscreen
- Sunglasses & sun hat
- A jumper for the evenings
- Rain jacket or umbrella
Cascais in April: quick answers
Is Cascais hot in April?
No. In April, Cascais is mild: daytime highs average 18 °C and nights drop to about 13 °C.
Can you swim in Cascais in April?
Only if you don't mind cold water: in April the sea averages just 15.7 °C. Comfortable swimming temperatures are not reached at any time of year.
Does it rain much in Cascais in April?
Rain falls on about 9 days, adding up to 52 mm.
Cascais month by month
The whole year in CascaisAll destinations: PortugalWhere to go in AprilSea temperature in April
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)