Sea Temperature in Cascais in September

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Complete information on the sea temperature range in the Atlantic Ocean in Cascais in September. Historical daily data. Climate details for September. Tips on swimming conditions and beach relaxation in Cascais. We find every spot where you can swim and tell you what the water temperature is there today and throughout the year.

Cascais Climate and Swimming Opportunities in September

Cascais lies within the Lisbon metropolitan area in Portugal. The average daytime temperature in Cascais in September is 23°C (73°F), while the nighttime average is 15°C (60°F). There are typically five rainy days during the month, with a total precipitation of 30 mm (1.2 inches). The daylight duration in September in Cascais is 12 hours, with an average of 8 hours of sunshine per day. The average wind speed in September is 13 km/h (8 mph), and the humidity level is around 69%.

The water temperature in Cascais in September ranges from 18°C to 20°C (64°F to 68°F). At the beginning of the month, the average temperature is around 19°C (66°F), shifting to 19°C (66°F) by mid-September and reaching 19°C (66°F) in the last ten days. Overall, the average sea temperature in Cascais for September is 19°C (66°F). Very comfortable swimming conditions. The water is fresh but not too cold, and the air temperature is pleasant.

Frequently Asked Questions About Water Temperatures in September in Cascais