Weather in Lisbon for September 2025
In general, the average temperature in Lisbon at the beginning of September is 23.7 °C. As the month progressed, temperatures tended to moderately rise, reaching an average of 25.3 °C by the end of September.
Lisbon sees moderate rainfall in September, averaging 9 rainy days.
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Lisbon in September average weather
| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  25° | 2  23° | 3 22° | 4  25° | 5 24° | 6  23° | 7 24° |
| 8  24° | 9 24° | 10 23° | 11  25° | 12  25° | 13 27° | 14 27° |
| 15 28° | 16 26° | 17 25° | 18 24° | 19 24° | 20 22° | 21 22° |
| 22 23° | 23 24° | 24 24° | 25 25° | 26 24° | 27 24° | 28 26° |
| 29 27° | 30 27° |
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Temperatures trend during September in Lisbon
September weather day by day
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. | Overcast | 25° /17° | 0.1 mm | 6 | |
| 2 Sept. | Patchy rain possible | 23° /16° | 3.5 mm | 5 | |
| 3 Sept. | Light rain shower | 22° /15° | 7.2 mm | 5 | |
| 4 Sept. | Light drizzle | 25° /15° | 5.8 mm | 6 | |
| 5 Sept. | Light rain shower | 24° /17° | 1.7 mm | 6 | |
| 6 Sept. | Cloudy | 23° /16° | 0 mm | 6 | |
| 7 Sept. | Patchy rain possible | 24° /16° | 0.1 mm | 6 | |
| 8 Sept. | Mist | 24° /17° | 0 mm | 6 | |
| 9 Sept. | Light rain shower | 24° /17° | 1.5 mm | 6 | |
| 10 Sept. | Light rain shower | 23° /17° | 0.3 mm | 5 | |
| 11 Sept. | Partly cloudy | 25° /17° | 0 mm | 6 | |
| 12 Sept. | Sunny | 25° /17° | 0 mm | 7 | |
| 13 Sept. | Sunny | 27° /17° | 0 mm | 7 | |
| 14 Sept. | Sunny | 27° /19° | 0 mm | 7 | |
| 15 Sept. | Cloudy | 28° /19° | 0 mm | 7 | |
| 16 Sept. | Light rain shower | 26° /19° | 4.4 mm | 7 | |
| 17 Sept. | Light rain shower | 25° /18° | 5.4 mm | 6 | |
| 18 Sept. | Patchy rain possible | 24° /17° | 0.1 mm | 6 | |
| 19 Sept. | Sunny | 24° /16° | 0 mm | 6 | |
| 20 Sept. | Patchy rain possible | 22° /17° | 0.2 mm | 5 | |
| 21 Sept. | Light rain shower | 22° /18° | 2.4 mm | 5 | |
| 22 Sept. | Partly cloudy | 23° /16° | 0 mm | 6 | |
| 23 Sept. | Sunny | 24° /15° | 0 mm | 6 | |
| 24 Sept. | Sunny | 24° /16° | 0 mm | 6 | |
| 25 Sept. | Sunny | 25° /18° | 0.3 mm | 6 | |
| 26 Sept. | Partly cloudy | 24° /17° | 1.4 mm | 6 | |
| 27 Sept. | Sunny | 24° /16° | 0.1 mm | 6 | |
| 28 Sept. | Sunny | 26° /15° | 0 mm | 7 | |
| 29 Sept. | Sunny | 27° /17° | 0 mm | 7 | |
| 30 Sept. | Sunny | 27° /18° | 0 mm | 7 | |
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Guide for Lisbon in September
In September, Lisbon, Portugal experiences a transition from the warm summer weather to the mild temperatures of early autumn. At the beginning of the month, the weather in Lisbon is generally warm and pleasant, with average temperatures around 25° during the day and 17° at night.
The city enjoys plenty of sunshine, making it an ideal time for outdoor activities and sightseeing. However, occasional light showers can be expected, so it's advisable to carry an umbrella or light rain jacket.
As the month progresses, the temperatures in Lisbon gradually begin to cool down. By the end of September, the average daytime temperatures drop to around 23°, while the evenings become cooler with temperatures around 15°.
The chances of rainfall also decrease towards the end of the month, providing visitors with more opportunities to explore the city and its surroundings without the interruption of rain.
Overall, September in Lisbon offers a pleasant transition from summer to autumn, with comfortable temperatures and decreasing chances of rain as the month progresses, making it an excellent time to visit and enjoy the city's attractions and outdoor spaces.
Lisbon in September - FAQ
What to pack to Lisbon in September?
As you prepare for your trip to Lisbon 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 Lisbon, 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 Lisbon
UV exposure in Lisbon during September
Quick links
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