Cascais Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Cascais.
Climate overview of Cascais
The climate in Cascais, Lisbon Region, Portugal, is remarkably consistent, with temperatures year-round averaging 19°C (66°F). The warmest month is August at 22°C (72°F), and the coolest is January at 16°C (61°F).
The city receives around 624 mm (25 in) of rainfall per year. It experiences a distinct dry season from June to September. November is the wettest month and July the driest. Sunshine peaks in July, when the city sees around 12.8 hours of sunshine per day.
Cascais Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Cascais - and find the best time to visit.
Monthly Temperature in Cascais
In Cascais temperatures are generally consistent throughout the year. On average, daytime temperatures range from a comfortable 22°C (72°F) in August to a moderate 16°C (61°F) in January.
Nighttime temperatures range from 18°C (64°F) in August to 12°C (54°F) in January.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Cascais
On average, Cascais receives a reasonable amount of rainfall, with an annual precipitation of 624 mm (25 in). The seasons in Cascais bring significant changes in precipitation. The wettest month, November, receives moderate rainfall, with an average of 95 mm (3.7 in) of precipitation. This rainfall is distributed across 13 rainy days.
In contrast, the driest month, July, experiences much less rainfall, totaling 3.1 mm (0.1 in) over 2 rainy days. These distinct seasonal differences provide diverse experiences throughout the year. For more details, please visit our Cascais Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Sunshine Hours in Cascais
In Cascais, summer days are longer and more sunny, with daily sunshine hours peaking at 12.8 hours in July. As the darker season arrives, the brightness of the sun becomes less. December sees a soft sun for only 5.4 hours per average day.
Visit our detailed sunshine hours page for more information.
Monthly hours of sunshine
Daily hours of sunshine
Daily percentage of sunshine
Humidity in Cascais by Month
The relative humidity is high throughout the year in Cascais.
The city experiences its highest humidity in January, reaching 82%. In July, the humidity drops to its lowest level at 71%. What does this mean? Read our detailed page on humidity levels for further details.
Relative humidity over the year
Best Time to Visit Cascais
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
- Best overall: June, July, August, September and October
- Warmest weather: July, August and September
- Most sunshine: July
- Fewest rainy days: July and August
- Seasonal pattern: A distinct dry season from June to September
Frequently asked questions about the climate in Cascais
What is the best time to visit Cascais?
June, July, August, September and October typically offer the most optimal weather in Cascais. In contrast, January, February, March, April and December tend to have less optimal conditions. Cascais has a distinct dry season from June to September.
What temperatures can I expect in Cascais?
Daytime highs range from 16°C (61°F) in January to 22°C (72°F) in August. Nighttime lows range from 12°C (54°F) to 18°C (64°F). Temperatures stay relatively stable year-round.
How much rain does Cascais get?
Annual rainfall is around 624 mm (25 in). November is the wettest month with 95 mm (3.7 in), while July is the driest with 3.1 mm (0.1 in).
How sunny is Cascais?
Cascais receives around 3,091 hours of sunshine per year. July is the sunniest month with 385 hours, while December is the cloudiest with just 162 hours. Overall, Cascais enjoys abundant sunshine.
Cascais 3-Day Forecast
Cascais on the map
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