Weather in Portugal for September 2025
Until now, September 2025 in Portugal is slightly cooler than the historical average by -0.8 °C.
The forecast for the next days in Portugal predicts temperatures to be around 24 °C, close to the historical average.
In general, the average temperature in Portugal at the beginning of September is 25 °C. As the month progressed, temperatures tended to moderately fall, reaching an average of 23.1 °C by the end of September.
The climate of Portugal in September is notably wet, with an average of 13 rainy days, and a total of 50 mm of precipitation.
Is September a good time to visit Portugal? check out the best time to travel to Portugal page.
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Portugal Weather September
What’s the Weather Like in Portugal This September?
Temperatures trend during September in Portugal
September weather in Portugal day by day
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. |  Patchy rain possible | 25° /17° | 0.1 mm | 6 | |
| 2 Sept. | Patchy rain possible | 25° /16° | 1.4 mm | 6 | |
| 3 Sept. |  Sunny | 24° /16° | 2.9 mm | 6 | |
| 4 Sept. | Sunny | 26° /16° | 2.4 mm | 6 | |
| 5 Sept. |  Partly cloudy | 25° /17° | 0.8 mm | 6 | |
| 6 Sept. | Partly cloudy | 25° /17° | 0 mm | 6 | |
| 7 Sept. | Patchy rain possible | 25° /17° | 1.2 mm | 6 | |
| 8 Sept. | Patchy rain possible | 24° /17° | 0.3 mm | 6 | |
| 9 Sept. | Partly cloudy | 25° /17° | 0.6 mm | 6 | |
| 10 Sept. | Partly cloudy | 25° /18° | 0.1 mm | 6 | |
| 11 Sept. | Partly cloudy | 25° /17° | 0.1 mm | 6 | |
| 12 Sept. | Sunny | 25° /17° | 4.2 mm | 6 | |
| 13 Sept. | Sunny | 25° /18° | 6.6 mm | 6 | |
| 14 Sept. | Sunny | 25° /18° | 8.4 mm | 6 | |
| 15 Sept. | Sunny | 28° /18° | 0 mm | 1.7 | |
| 16 Sept. | Sunny | 28° /16° | 0 mm | 1.7 | |
| 17 Sept. | Sunny | 29° /18° | 0 mm | 1.6 | |
| 18 Sept. | Sunny | 29° /20° | 0 mm | 1.5 | |
| 19 Sept. | Patchy rain possible | 28° /21° | 1.7 mm | 1.1 | |
| 20 Sept. | Sunny | 27° /19° | 0 mm | 6 | |
| 21 Sept. | Sunny | 22° /17° | 0 mm | 5 | |
| 22 Sept. | Partly cloudy | 19° /15° | 0 mm | 5 | |
| 23 Sept. | Sunny | 20° /15° | 0 mm | 5 | |
| 24 Sept. | Sunny | 21° /14° | 0 mm | 5 | |
| 25 Sept. | Sunny | 21° /14° | 0 mm | 5 | |
| 26 Sept. | Partly cloudy | 23° /16° | 0 mm | 5 | |
| 27 Sept. | Sunny | 23° /16° | 0 mm | 5 | |
| 28 Sept. | Sunny | 23° /16° | 0 mm | 5 | |
| 29 Sept. | Sunny | 25° /16° | 0.1 mm | 6 | |
| 30 Sept. | Sunny | 26° /17° | 0 mm | 7 | |
| Next | |||||
Portugal weather in September vs August vs October
| August | September | October | |
|---|---|---|---|
| Weather | Sunny | Sunny | Patchy rain possible |
| Temperatures | 27°/18° | 25°/17° | 23°/17° |
| Rainfall | 0 mm | 50 mm | 68 mm |
| Wind | 25.1 km/h | 21.6 km/h | 20.5 km/h |
| Humidity | 66% | 68% | 69% |
| Rainy days | 0 days | 13 days | 16 days |
| Dry days | 31 days | 17 days | 15 days |
Planning a trip to Portugal? Discover the best time to visit
Guide for Portugal in September
In September, Portugal experiences a transition from the warm summer weather to the cooler temperatures of autumn.
At the beginning of the month, the southern region, including popular destinations like the Algarve, typically enjoys warm and sunny days with temperatures averaging around 25° during the day and 17° at night.
The northern region, including Porto and the Douro Valley, experiences similar temperatures but with a slightly higher chance of rainfall.
As the month progresses, Portugal begins to feel the effects of the changing season. By the end of September, temperatures start to decrease gradually. In the southern region, daytime temperatures may drop to around 22° while nighttime temperatures can fall to around 14°.
In the northern region, temperatures may also decrease slightly, with daytime averages around 20° and nighttime temperatures around 12°. Additionally, there is a higher likelihood of rainfall in the northern areas as autumn sets in.
Overall, September in Portugal offers a pleasant transition from summer to autumn, with warm temperatures at the beginning of the month giving way to cooler, more comfortable weather by the end.
Portugal in September - FAQ
Portugal water temperatures in September
The average water temperature of the Atlantic Ocean near Portugal in September is 17.1 °C. Temperatures remain fairly consistent throughout the month.
- What is the water temperature in Portugal in September?
- The average water temperature in Portugal in September is 17.1 °C.
- Can you swim in Portugal in September?
- Brisk: quick dips and active swimming are fine, but pack a 2–3 mm spring suit if you plan longer sessions or early-morning outings.
What to pack to Portugal in September?
As you prepare for your trip to Portugal 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 Portugal, 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
- Footwear
- Waterproof Shoes
- 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 Portugal
UV exposure in Portugal during September
Quick links
Where is Portugal?Get accurate weather forecasts for Portugal, located at latitude 38.717 and longitude -9.133. Stay updated with localized weather information tailored for Portugal.