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PortugalThe weather in September in Cascais
It's warm in September in Cascais with an average temperature of 26°C. Temperatures this month range from a low of 25°C to a high of 28°C. At night, you can expect temperatures between 16°C and 19°C.
Looking for great weather? September is a good time to be in Cascais. The temperatures are nice, and there’s not too much rain.
Average temperatures and precipitation
This chart shows the average daily maximum and minimum temperatures (in degrees Celsius) and precipitation (in millimeters) in September for Cascais, Portugal. A low precipitation value usually indicates little to no rainfall on that day in recent years, while a higher value suggests more frequent rainfall.
Temperature records
With 39°C in 2016, Cascais reached the highest temperature in September over the past 10 years. The lowest daytime temperature in this month was 20°C in 2022. The extreme nighttime temperatures ranged from a lowest recorded value of 12°C to a highest value of 25°C.
Water temperature
The water temperature at Cascais is 22°C this month. Pleasant for a swim.
Rainfall amount
In September, there is an average of 28 mm of precipitation, spread over 5 days. The wind speed is around 4 Bft, mostly coming from the West.
Daily weather in September for Cascais
Click on any day in September to get detailed info about the usual weather on that day in Cascais. Check out the historical temperatures and precipitation over the past 10 years on this day.
September weather comparison
| Cascais | New York | |
|---|---|---|
| Average temperature | 26°C | 27°C |
| Max. temperature | 28°C | 31°C |
| Min. temperature | 16°C | -5°C |
| Total precipitation | 28 mm | 57 mm |
| Rainy days | 5 days | 9 days |
Start of September
The month of September starts in Cascais with hot temps, averaging around 28°C during the day and nights around 19°C.
Mid September
By mid-September, daytime temps drop to around 26°C, with nights around 18°C. Not much precipitation expected during this period. It’s mostly dry and sunny.
End of September
By the end of September, the average daytime temperature in Cascais is around 26°C, while nighttime temps are about 17°C. There’s hardly any chance of precipitation. The weather will be mostly dry with plenty of sun.
Find affordable trips to Cascais
UV index
The UV index is a maximum of 8 this month. That's a very high value on the intensity scale of 1 to 11. Unprotected skin can burn within 10-15 minutes.
Check out the climate of Cascais for all months and discover the best travel time
Curious about the weather in other parts of Portugal? Check out the climate and weather for spots like Algarve, Lisbon, Albufeira, or explore other destinations in Portugal.
Temperature charts
These charts show the average temperatures in September in Cascais, Portugal. The temperatures are shown in degrees Celsius and are calculated based on data from the past 10 years.
Daily Temperature in September in Cascais
Temperature in September in Cascais over the years
Precipitation charts
These charts show the average amount of precipitation in September in Cascais, Portugal. Precipitation is always measured as water, even when it falls as snow or hail The amount of precipitation is displayed in millimeters, while snowfall is shown in centimeters.
Daily Precipitation in September in Cascais
Total precipitation in September in Cascais over the years
Daily UV index in September in Cascais
This chart shows the average daily UV index in September in Cascais, with the UV index ranging from 0 to a maximum of 11. The bottom of the chart shows the days of the month. Based on historical data, this chart provides an idea of the daily UV radiation levels you can expect.
Weather experiences in September in Cascais
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Average weather in Cascais by month
Click on a month below to see detailed weather info for Cascais. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.