Weather in Porto for September 2025
Until now, September 2025 in Porto is slightly cooler than the historical average by -1.8 °C.
Expect cooler weather in the next days in Porto with the forecast suggesting a temperature of 21.3 °C, lower than the historical average.
In general, the average temperature in Porto at the beginning of September is 22.1 °C. As the month progressed, temperatures tended to moderately fall, reaching an average of 20.7 °C by the end of September.
Porto experiences heavy rainfall in September, with over 20 rainy days and an average total precipitation 86.6 mm.
Is September a good time to visit Porto? check out the best time to travel to Porto page.
New! Chat with our AI weatherman - it’s amazing and free.
Temperatures
Rain 🌧️
More
Porto Weather September
Temperatures trend during September in Porto
September weather in Porto day by day
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. |  Patchy rain possible | 22° /16° | 3.2 mm | 5 | |
| 2 Sept. | Patchy rain possible | 21° /15° | 0.2 mm | 5 | |
| 3 Sept. |  Partly cloudy | 22° /15° | 2 mm | 6 | |
| 4 Sept. |  Sunny | 23° /15° | 1.4 mm | 5 | |
| 5 Sept. | Sunny | 23° /16° | 4.6 mm | 6 | |
| 6 Sept. |  Cloudy | 22° /16° | 1.4 mm | 5 | |
| 7 Sept. | Patchy rain possible | 22° /16° | 4 mm | 5 | |
| 8 Sept. |  Moderate or heavy rain shower | 22° /16° | 2.2 mm | 5 | |
| 9 Sept. | Moderate rain at times | 22° /16° | 4.1 mm | 5 | |
| 10 Sept. | Patchy rain possible | 22° /16° | 1.4 mm | 5 | |
| 11 Sept. | Partly cloudy | 23° /16° | 0.4 mm | 6 | |
| 12 Sept. | Partly cloudy | 23° /16° | 2.2 mm | 6 | |
| 13 Sept. | Sunny | 23° /16° | 13.8 mm | 6 | |
| 14 Sept. | Partly cloudy | 23° /17° | 5.7 mm | 6 | |
| 15 Sept. | Sunny | 22° /17° | 0 mm | 1.5 | |
| 16 Sept. | Sunny | 24° /16° | 0 mm | 1.4 | |
| 17 Sept. | Sunny | 24° /17° | 0 mm | 1.4 | |
| 18 Sept. | Sunny | 25° /18° | 0 mm | 1.4 | |
| 19 Sept. | Patchy rain possible | 26° /19° | 0.2 mm | 1 | |
| 20 Sept. | Sunny | 21° /16° | 0 mm | 5 | |
| 21 Sept. | Sunny | 20° /13° | 0 mm | 5 | |
| 22 Sept. | Partly cloudy | 19° /12° | 0 mm | 5 | |
| 23 Sept. | Sunny | 18° /11° | 0 mm | 4 | |
| 24 Sept. | Sunny | 19° /12° | 0 mm | 5 | |
| 25 Sept. | Partly cloudy | 20° /15° | 0 mm | 5 | |
| 26 Sept. | Sunny | 20° /15° | 0 mm | 5 | |
| 27 Sept. | Partly cloudy | 22° /17° | 0.1 mm | 5 | |
| 28 Sept. | Patchy rain possible | 18° /18° | 3.5 mm | 4 | |
| 29 Sept. | Sunny | 22° /15° | 1.1 mm | 6 | |
| 30 Sept. | Partly cloudy | 24° /15° | 0 mm | 6 | |
| Next | |||||
Porto weather in September vs August vs October
| August | September | October | |
|---|---|---|---|
| Weather | Sunny | Patchy rain possible | Patchy rain possible |
| Temperatures | 24°/17° | 22°/16° | 21°/15° |
| Rainfall | 4 mm | 87 mm | 260 mm |
| Wind | 19.4 km/h | 18.6 km/h | 19.8 km/h |
| Humidity | 71% | 71% | 72% |
| Rainy days | 1 days | 23 days | 27 days |
| Dry days | 30 days | 7 days | 4 days |
Planning a trip to Porto? Discover the best time to visit
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
Where is Porto?Get accurate weather forecasts for Porto, located at latitude 41.15 and longitude -8.611. Stay updated with localized weather information tailored for Porto.