Temperatures in September
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.
Max and Min Temperatures per Day
This chart shows the daily maximum and minimum temperatures in degrees Celsius for Cascais in September. The red line indicates the max temperatures, and the blue line shows the minimums.
Start of September
The month of September starts in Cascais with hot temperatures, averaging around 28°C during the day and nights close to 19°C. There’s little chance of precipitation. The weather is mostly sunny and dry.
Since temperatures can differ between day and night, it’s a good idea to dress in layers.
Mid-September
By mid-September, the average daytime temperature drops to around 26°C, with nights close to 18°C. Not much precipitation expected during this period. It’s mostly dry with sunshine.
Temperatures vary between day and night, so it’s smart to wear layers.
End of September
By the end of September, the average daytime temperature in Cascais will be around 26°C, with nights close to 17°C. Barely any chance of precipitation. The weather will mostly be dry with lots of sunshine.
As it gets cooler in the evening, it’s best to wear layers.
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Water temperature
The water temperature at Cascais is 22°C this month. Pleasant for a swim.
Precipitation in September
In September, there is an average of 28 mm of precipitation, spread over 4 days. The wind speed is around 4 Bft, mostly coming from the West.
The precipitation chance averages 15% per day this month. Though that seems low, there are also a few days with a higher chance of precipitation.
Precipitation Chance
This chart shows the daily precipitation chance (in percentages) in September for Cascais. 0% means it never rained on that day in the past 10 years, and 100% means it rained every day. All values in between represent the average chance of precipitation on that day.
Cascais in September |
London | ||
|---|---|---|---|
 Average Temperature |
26°C | 20°C | |
 High Temp |
28°C | 22°C | |
| Low Temp |
25°C | 17°C | |
 Total Precipitation |
28 mm | 44 mm | |
| Rainy Days |
4 days | 8 days | |
August
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.
Is September a good time to visit Cascais?
Want nice weather? Then September is a great time to be in Cascais. You’ll have pleasant temperatures and not too much rain this month.
Temperature records for Cascais in September
With 39°C, Cascais hit the highest temperature in the last 10 years in September 2016. The lowest daytime temperature in this month was 20°C in 2022. The extreme night temperatures ranged from a low of 12°C to a high of 25°C.
Check out the climate of Cascais for all months and discover the best travel time
Curious about the climate in other parts of Portugal? Check out the weather and climate in places like Algarve, Lisbon, Albufeira, or have a look at other destinations in Portugal.
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Daily Temperature in September in Cascais
This chart shows the average daily temperatures, both day and night, for each day in September in Cascais, measured in degrees Celsius. The red line represents the maximum temperatures, while the blue line shows the minimums. The days of the month are displayed at the bottom of the chart. The data, based on historical observations, gives an overview of the average daily temperatures during this month.
Daily Precipitation in September in Cascais
The chart below shows the average daily precipitation in September for Cascais, measured in millimetres over the past years. Precipitation is always measured as water, even if it’s snow or hail. The days of the month are shown at the bottom of the chart.
A low average precipitation means that the chance of rain on that day is usually small, while a higher average suggests that rain is more likely. But it’s still an average, so each day can be different. Based on historical weather data for September, you can expect around 4 days of rain in Cascais.
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.
Temperature in September in Cascais Over the Years
This chart shows the average temperature in September in Cascais, measured in degrees Celsius, over the past years.
Total Precipitation in September in Cascais Over the Years
This chart shows the average precipitation in September in Cascais, measured in millimetres over the past years. Precipitation is always measured as water, even if it’s snow or hail.
Daily climate in September for Cascais
Click on a specific day in September for detailed info on the typical weather on that day in Cascais. Check out the historical temperatures and precipitation over the past 10 years on this day.
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.
