Weather in Porto for September 2025
In general, the average temperature in Porto at the beginning of September is 21.6 °C. As the month progressed, temperatures tended to slightly increase, reaching an average of 21.7 °C by the end of September.
The climate of Porto in September is notably wet, with an average of 15 rainy days.
Is September a good time to visit Porto? check out the best time to travel to Porto page.
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Porto in September average weather
| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  21° | 2  21° | 3  21° | 4 23° | 5 22° | 6  21° | 7 22° |
| 8  22° | 9 22° | 10 22° | 11 22° | 12  22° | 13 25° | 14 26° |
| 15  24° | 16 25° | 17  23° | 18 23° | 19 21° | 20 20° | 21 20° |
| 22 20° | 23 20° | 24 20° | 25 21° | 26 21° | 27 20° | 28 22° |
| 29 23° | 30 25° |
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Temperatures trend during September in Porto
September weather day by day
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. | Light rain shower | 21° /16° | 1.5 mm | 5 | |
| 2 Sept. | Partly cloudy | 21° /15° | 0.2 mm | 6 | |
| 3 Sept. | Light rain | 21° /14° | 4.8 mm | 6 | |
| 4 Sept. | Light rain shower | 23° /15° | 2.8 mm | 6 | |
| 5 Sept. | Patchy rain possible | 22° /16° | 4.9 mm | 5 | |
| 6 Sept. | Thundery outbreaks possible | 21° /15° | 0.4 mm | 5 | |
| 7 Sept. | Patchy rain possible | 22° /16° | 0.9 mm | 5 | |
| 8 Sept. | Patchy light rain with thunder | 22° /15° | 0.9 mm | 6 | |
| 9 Sept. | Light rain shower | 22° /15° | 7.3 mm | 6 | |
| 10 Sept. | Patchy rain possible | 22° /16° | 1.5 mm | 6 | |
| 11 Sept. | Patchy rain possible | 22° /16° | 0.2 mm | 6 | |
| 12 Sept. | Sunny | 22° /15° | 0 mm | 6 | |
| 13 Sept. | Sunny | 25° /16° | 0 mm | 6 | |
| 14 Sept. | Partly cloudy | 26° /17° | 0 mm | 7 | |
| 15 Sept. | Cloudy | 24° /17° | 0 mm | 6 | |
| 16 Sept. | Light rain shower | 25° /18° | 1.9 mm | 6 | |
| 17 Sept. | Moderate or heavy rain with thunder | 23° /17° | 6.2 mm | 6 | |
| 18 Sept. | Light rain shower | 23° /16° | 2.7 mm | 6 | |
| 19 Sept. | Sunny | 21° /16° | 0 mm | 6 | |
| 20 Sept. | Patchy rain possible | 20° /15° | 2.5 mm | 5 | |
| 21 Sept. | Light rain shower | 20° /15° | 8 mm | 5 | |
| 22 Sept. | Patchy rain possible | 20° /14° | 0.4 mm | 4 | |
| 23 Sept. | Sunny | 20° /13° | 0 mm | 6 | |
| 24 Sept. | Sunny | 20° /14° | 2.2 mm | 5 | |
| 25 Sept. | Sunny | 21° /16° | 3.3 mm | 5 | |
| 26 Sept. | Sunny | 21° /16° | 10.2 mm | 5 | |
| 27 Sept. | Sunny | 20° /15° | 0.5 mm | 5 | |
| 28 Sept. | Sunny | 22° /14° | 0 mm | 6 | |
| 29 Sept. | Sunny | 23° /16° | 0 mm | 7 | |
| 30 Sept. | Sunny | 25° /17° | 0 mm | 7 | |
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Guide for Porto in September
In September, Porto, Portugal experiences pleasant weather with the transition from summer to autumn. At the beginning of the month, Porto typically enjoys warm and sunny days with average temperatures around 22° during the day and 15° at night.
The city experiences a comfortable Mediterranean climate, making it an ideal time to explore the charming streets and beautiful coastline. However, it's advisable to pack a light jacket or sweater for the cooler evenings.
As the month progresses, Porto sees a gradual decrease in temperatures towards the end of September. By the end of the month, the average daytime temperatures tend to hover around 20°, while the nights become cooler with temperatures dropping to around 13°.
Visitors can still expect plenty of sunshine and relatively dry weather, perfect for outdoor activities and sightseeing. It's worth noting that September marks the beginning of the autumn season, so travelers can also witness the stunning fall foliage in and around Porto.
Overall, September offers a delightful climate in Porto, making it an excellent time to visit and enjoy the city's attractions and outdoor spaces.
Porto in September - FAQ
What to pack to Porto in September?
As you prepare for your trip to Porto 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 Porto, 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 Porto
UV exposure in Porto during September
Quick links
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