Weather in Portimão for September 2026
Yellow High Temperature Warning - See hour by hour.
Until now, September 2026 in Portimão has been significantly warmer than historical averages.
The forecast for the coming days of September 2026 predicts a temperature of 33.2 °C , which is warmer than usual.
In general, the average temperature in Portimão at the beginning of September is 28 °C. As the month progressed, temperatures tended to moderately fall, reaching an average of 26 °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 | 27° /15° | 0 mm | 7 | |
| 2 Sept. | Sunny | 28° /15° | 0.9 mm | 7 | |
| 3 Sept. | Sunny | 29° /17° | 1.7 mm | 7 | |
| 4 Sept. |  Overcast | 27° /17° | 1.2 mm | 5 | |
| 5 Sept. | Sunny | 29° /18° | 0 mm | 7 | |
| 6 Sept. | Sunny | 28° /18° | 0 mm | 6 | |
| 7 Sept. | Sunny | 28° /17° | 0 mm | 7 | |
| 8 Sept. | Sunny | 27° /16° | 0 mm | 6 | |
| 9 Sept. |  Partly cloudy | 25° /17° | 0.1 mm | 6 | |
| 10 Sept. |  Mist | 24° /17° | 0 mm | 6 | |
| 11 Sept. | Sunny | 31° /17° | 0 mm | 7.4 | |
| 12 Sept. | Sunny | 34° /19° | 0 mm | 7.3 | |
| 13 Sept. | Sunny | 35° /20° | 0 mm | 7.1 | |
| 14 Sept. | Sunny | 36° /20° | 0 mm | 7.2 | |
| 15 Sept. | Sunny | 35° /20° | 0 mm | 9 | |
| 16 Sept. | Sunny | 30° /16° | 0 mm | 7 | |
| 17 Sept. | Sunny | 32° /17° | 0 mm | 8 | |
| 18 Sept. | Sunny | 29° /17° | 0 mm | 7 | |
| 19 Sept. | Sunny | 32° /18° | 0 mm | 8 | |
| 20 Sept. | Sunny | 32° /20° | 0 mm | 8 | |
| 21 Sept. | Sunny | 36° /20° | 0 mm | 9 | |
| 22 Sept. | Sunny | 34° /22° | 0 mm | 8 | |
| 23 Sept. | Overcast | 35° /22° | 0 mm | 9 | |
| 24 Sept. | Overcast | 34° /22° | 0 mm | 7 | |
| 25 Sept. | Sunny | 24° /17° | 0.1 mm | 6 | |
| 26 Sept. | Partly cloudy | 24° /18° | 0.1 mm | 6 | |
| 27 Sept. | Partly cloudy | 24° /16° | 0 mm | 6 | |
| 28 Sept. | Sunny | 24° /16° | 0.7 mm | 6 | |
| 29 Sept. | Sunny | 26° /16° | 0 mm | 6 | |
| 30 Sept. | Sunny | 26° /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° | 25°/17° | 23°/17° |
| Rainfall | 0 mm | 9 mm | 70 mm |
| Wind | 24.2 km/h | 21.8 km/h | 20.4 km/h |
| Humidity | 62% | 68% | 74% |
| Rainy days | 0 days | 4 days | 11 days |
| Dry days | 31 days | 26 days | 20 days |
Planning a trip to Portimão? Discover the best time to visit
Portimão in September - FAQ
What are the expected maximum and minimum temperatures in Portimão during September?
How much rainfall should be expected in Portimão during September?
What are the typical wind conditions in Portimão during September?
Portimão water temperatures in September
The average water temperature of the Atlantic Ocean near Portimão in September is 18.5 °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 18.5 °C.
- Can you swim in Portimão in September?
- Refreshing and invigorating. Expect to feel chilled after 10–20 minutes; a shorty wetsuit extends water time, especially at dawn.
September rainfall patterns in Portimão
UV exposure in Portimão during September
What to pack to Portimão in September?
Mild & changeable · highs around 25 °C, occasional showers
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
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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.