Cascais Temperature by Month
The average annual maximum temperature in Cascais, Lisbon Region, Portugal is 19°C (66°F), with little variation between seasons. This page covers monthly averages, day-night differences, and how Cascais compares to cities worldwide.
Cascais Monthly Temperatures
The temperature in Cascais changes very little across the seasons, maintaining a similar climate throughout the year. Maximum daytime temperatures range from a moderate 16°C (61°F) in February to a comfortable 22°C (72°F) in August. Nighttime lows range from 18°C (64°F) in August to 12°C (54°F) in February.
The chart below illustrates the average maximum day and minimum night temperatures in Cascais by month:
Daily lows are most common between 4 AM and 6 AM. By 3 PM temperatures reach their daily high, driven by peak solar heating. August, the warmest month of the year, receives 355 hours of sunshine.
The chart below shows the average temperature throughout the year:
Daily Historical Temperatures
50-year average (1976-2025)
Average high and low temperatures for each day of the month based on long-term records.
Average temperatures in July
Historical Cascais Temperatures: 1976-2026
Browse day-by-day temperature records for Cascais spanning 51 years. Select any month and year to see actual high and low temperatures recorded on each day.
Temperature: Cascais vs Portugal
The map below shows the annual temperature across Portugal. You can also select individual months if you want to compare a specific time of year.
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Cascais vs World: Temperature Compared
Cascais's average annual maximum temperature is 19°C (66°F). To put that in context, here's how it compares to a few well-known destinations:
Athens, Greece sits at 23°C (73°F) on average, with hot dry summers and mild winters characteristic of the Mediterranean.
On the cooler end, Oslo, Norway averages just 10°C (50°F) annually, with pleasant summers but long, cold winters.
San Francisco, USA averages 19°C (66°F) annually, but with little seasonal variation — summers are often cool and foggy, winters mild.
Perth, Australia averages 25°C (77°F) annually, with a classic Mediterranean climate — hot dry summers and mild wet winters.
What Does the Temperature Feel Like in Cascais?
Temperature alone doesn't tell the whole story — humidity plays a big role in how warm or cold it actually feels. High humidity in summer makes the heat feel more intense, particularly once temperatures climb above 25°C. In winter, the same humidity can make cold air feel sharper than the thermometer suggests.
In Cascais, February is the coolest month, with average highs of 16°C (61°F) and humidity around 77% — considered high. For a full picture, see our humidity page.
Climate temperature data is typically calculated as a 30-year average. This smooths out year-to-year variability and gives a more reliable picture of what a place is actually like, rather than what happened in any single unusual year.
The readings come from a range of sources — land-based weather stations, ocean buoys, ships, and satellites. That data is collected by weather services around the world, then pooled, quality-checked, and averaged to produce the climate records you see here.
Seasonal temperature shifts influence more than just how warm it feels — they also drive changes in rainfall, cloud cover, and wind patterns throughout the year.
Warmer air holds more moisture, which tends to mean heavier or more frequent rain during the warmer months. When temperatures drop in winter, any precipitation that does fall is more likely to come as snow or sleet, though in Cascais this rarely lasts long on the ground.
For more on Cascais's weather — including monthly rainfall, sunshine hours, and humidity — visit our Cascais climate page.
