Cascais
September
Weather in Cascais for September 2025
Your guide to Cascais weather in September - trends and predictions
In general, the average temperature in Cascais at the beginning of September is 20.3 °C. As the month progressed, temperatures tended to moderately rise, reaching an average of 21.7 °C by the end of September.
Cascais sees moderate rainfall in September, averaging 8 rainy days.
Is September a good time to visit Cascais? check out the best time to travel to Cascais page.
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Temperatures
Rain 🌧️
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22
Dry days
8
Rainy days
0
Snow days
21°/18°
Temperatures
25 km/h
Avg max wind
77 %
Avg humidity
Cascais in September average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  21° | 2  20° | 3  20° | 4  21° | 5 20° | 6  19° | 7 21° |
| 8 20° | 9 21° | 10  20° | 11 21° | 12 21° | 13 22° | 14 23° |
| 15 23° | 16 23° | 17 22° | 18 21° | 19 21° | 20 20° | 21 21° |
| 22 20° | 23 20° | 24 21° | 25 22° | 26 21° | 27 21° | 28 21° |
| 29 23° | 30 23° |
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Temperatures trend during September in Cascais
See the weather trend as well as the moving average line
September weather day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. | Overcast | 21° /17° | 0 mm | 6 | |
| 2 Sept. | Sunny | 20° /17° | 0.1 mm | 5 | |
| 3 Sept. | Light rain shower | 20° /16° | 2 mm | 5 | |
| 4 Sept. | Light rain | 21° /16° | 5.7 mm | 6 | |
| 5 Sept. | Light rain shower | 20° /17° | 2.1 mm | 5 | |
| 6 Sept. | Cloudy | 19° /17° | 0 mm | 5 | |
| 7 Sept. | Patchy rain possible | 21° /17° | 0.3 mm | 6 | |
| 8 Sept. | Overcast | 20° /17° | 0 mm | 5 | |
| 9 Sept. | Patchy rain possible | 21° /18° | 1.3 mm | 6 | |
| 10 Sept. | Partly cloudy | 20° /18° | 0.2 mm | 5 | |
| 11 Sept. | Sunny | 21° /18° | 0 mm | 6 | |
| 12 Sept. | Sunny | 21° /17° | 0 mm | 6 | |
| 13 Sept. | Sunny | 22° /17° | 0 mm | 6 | |
| 14 Sept. | Sunny | 23° /18° | 0 mm | 6 | |
| 15 Sept. | Cloudy | 23° /18° | 0 mm | 6 | |
| 16 Sept. | Light rain shower | 23° /19° | 4.6 mm | 6 | |
| 17 Sept. | Light rain shower | 22° /18° | 7.9 mm | 6 | |
| 18 Sept. | Patchy rain possible | 21° /17° | 0.2 mm | 6 | |
| 19 Sept. | Sunny | 21° /17° | 0 mm | 6 | |
| 20 Sept. | Patchy rain possible | 20° /17° | 0.4 mm | 5 | |
| 21 Sept. | Light rain | 21° /18° | 1.4 mm | 5 | |
| 22 Sept. | Patchy rain possible | 20° /17° | 0.2 mm | 6 | |
| 23 Sept. | Sunny | 20° /16° | 0 mm | 6 | |
| 24 Sept. | Sunny | 21° /17° | 0 mm | 6 | |
| 25 Sept. | Sunny | 22° /18° | 0.3 mm | 6 | |
| 26 Sept. | Partly cloudy | 21° /18° | 1.5 mm | 6 | |
| 27 Sept. | Sunny | 21° /17° | 0.2 mm | 5 | |
| 28 Sept. | Sunny | 21° /16° | 0 mm | 6 | |
| 29 Sept. | Sunny | 23° /17° | 0 mm | 6 | |
| 30 Sept. | Sunny | 23° /18° | 0 mm | 6 | |
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Important Notice
Our weather forecast for Cascais in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Cascais forecast closer to your planned date for the most up-to-date weather information.
Cascais in September - FAQ
What are the expected maximum and minimum temperatures in Cascais during September?
During September, expect a variety of temperatures with highs around 21° and lows near 18°, suitable for diverse activities and preferences.
How much rainfall should be expected in Cascais during September?
In September, Cascais can expect light to moderate rainfall, totaling 28.42 mm across approximately 8 days. Occasional showers are possible, and planning ahead for them could be helpful.
What are the typical wind conditions in Cascais during September?
The average wind speed in Cascais during September is 25 km/h, suggesting breezy to windy conditions, depending on your activities.
What to pack to Cascais in September?
As you prepare for your trip to Cascais in September, it's important to consider the typical weather patterns for the time of year. Below is a carefully tailored packing list to ensure that your time in Cascais, during September, is comfortable and enjoyable, regardless of the weather conditions.
- Clothing
- Layered Clothing: Light sweaters, long-sleeve shirts, light jackets, and comfortable pants
- Rain Gear: Lightweight, waterproof clothing
- Accessories
- Sunglasses: For sun protection
- Sun Hats: Wide-brimmed hats for sun protection in warm weather
- Umbrellas/Raincoats: For rainy days
September rainfall patterns in Cascais
Explore the daily rainfall trends and prepare for Cascaiss September weather 💧
UV exposure in Cascais during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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