Weather in Portimão for September 2025
So far, September 2025 in Portimão is slightly warmer than the historical average by 0.7 °C.
The forecast for the next days in Portimão predicts temperatures to be around 25 °C, close to the historical average.
In general, the average temperature in Portimão at the beginning of September is 25 °C. As the month progressed, temperatures tended to slightly decrease, reaching an average of 24.7 °C by the end of September.
With an average of 4 rainy days, Portimão experiences minimal rainfall in September.
Is September a good time to visit Portimão? check out the best time to travel to Portimão page.
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Portimão Weather September
Temperatures trend during September in Portimão
September weather in Portimão day by day
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. |  Sunny | 26° /16° | 0 mm | 6 | |
| 2 Sept. |  Light rain shower | 25° /16° | 1.1 mm | 6 | |
| 3 Sept. | Sunny | 25° /15° | 2.3 mm | 6 | |
| 4 Sept. | Light rain shower | 25° /15° | 1.6 mm | 6 | |
| 5 Sept. | Patchy rain possible | 26° /17° | 0 mm | 6 | |
| 6 Sept. |  Cloudy | 24° /16° | 0 mm | 6 | |
| 7 Sept. | Sunny | 24° /15° | 0 mm | 6 | |
| 8 Sept. |  Partly cloudy | 24° /16° | 0 mm | 6 | |
| 9 Sept. | Light rain shower | 24° /17° | 0.2 mm | 6 | |
| 10 Sept. |  Mist | 24° /17° | 0 mm | 6 | |
| 11 Sept. | Sunny | 27° /16° | 0 mm | 6 | |
| 12 Sept. | Sunny | 27° /16° | 0 mm | 7 | |
| 13 Sept. | Sunny | 28° /17° | 0 mm | 7 | |
| 14 Sept. | Sunny | 27° /18° | 0 mm | 7 | |
| 15 Sept. | Sunny | 28° /18° | 0 mm | 1.8 | |
| 16 Sept. | Sunny | 28° /18° | 0 mm | 1.8 | |
| 17 Sept. | Sunny | 27° /20° | 0 mm | 1.7 | |
| 18 Sept. | Sunny | 27° /21° | 0 mm | 1.5 | |
| 19 Sept. | Patchy rain possible | 26° /20° | 0.9 mm | 1.2 | |
| 20 Sept. | Patchy rain possible | 27° /19° | 1.2 mm | 5 | |
| 21 Sept. | Sunny | 27° /16° | 0 mm | 6 | |
| 22 Sept. | Sunny | 22° /14° | 0 mm | 5 | |
| 23 Sept. | Partly cloudy | 21° /14° | 0 mm | 5 | |
| 24 Sept. | Sunny | 24° /13° | 0 mm | 5 | |
| 25 Sept. | Sunny | 23° /15° | 0 mm | 5 | |
| 26 Sept. | Partly cloudy | 25° /15° | 0 mm | 5 | |
| 27 Sept. | Sunny | 25° /17° | 0 mm | 6 | |
| 28 Sept. | Partly cloudy | 23° /18° | 0 mm | 6 | |
| 29 Sept. | Sunny | 26° /17° | 0 mm | 7 | |
| 30 Sept. | Sunny | 27° /18° | 0 mm | 7 | |
| Next | |||||
Portimão weather in September vs August vs October
| August | September | October | |
|---|---|---|---|
| Weather | Sunny | Sunny | Patchy rain possible |
| Temperatures | 29°/18° | 24°/17° | 22°/17° |
| Rainfall | 0 mm | 12 mm | 88 mm |
| Wind | 24.7 km/h | 20.9 km/h | 21.8 km/h |
| Humidity | 62% | 70% | 74% |
| Rainy days | 0 days | 4 days | 14 days |
| Dry days | 31 days | 26 days | 17 days |
Planning a trip to Portimão? Discover the best time to visit
Portimão in September - FAQ
Portimão water temperatures in September
The average water temperature of the Atlantic Ocean near Portimão in September is 17 °C. Temperatures remain fairly consistent throughout the month.
- What is the water temperature in Portimão in September?
- The average water temperature in Portimão in September is 17 °C.
- Can you swim in Portimão 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 Portimão in September?
As you prepare for your trip to Portimão 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 Portimão, during September, is comfortable and enjoyable, regardless of the weather conditions.
- Clothing
- Layered Clothing: Light sweaters, long-sleeve shirts, light jackets, and comfortable pants
- Accessories
- Sunglasses: For sun protection
- Sun Hats: Wide-brimmed hats for sun protection in warm weather
September rainfall patterns in Portimão
UV exposure in Portimão during September
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Where is Portimão?Get accurate weather forecasts for Portimão, located at latitude 37.139 and longitude -8.538. Stay updated with localized weather information tailored for Portimão.