Weather in Lisbon for September 2026
In general, the average temperature in Lisbon at the beginning of September is 25 °C. As the month progressed, temperatures tended to slightly decrease, reaching an average of 24.6 °C by the end of September.
The climate of Lisbon in September is notably wet, with an average of 13 rainy days, and a total of 50 mm of precipitation.
Is September a good time to visit Lisbon? check out the best time to travel to Lisbon page.
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Lisbon Weather September
What’s the Weather Like in Lisbon This September?
Temperatures trend during September in Lisbon
September weather in Lisbon day by day
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. |  Patchy rain possible | 25° /17° | 0.1 mm | 6 | |
| 2 Sept. | Patchy rain possible | 25° /16° | 1.4 mm | 6 | |
| 3 Sept. |  Sunny | 24° /16° | 2.9 mm | 6 | |
| 4 Sept. | Sunny | 26° /16° | 2.4 mm | 6 | |
| 5 Sept. |  Partly cloudy | 25° /17° | 0.8 mm | 6 | |
| 6 Sept. | Partly cloudy | 25° /17° | 0 mm | 6 | |
| 7 Sept. | Patchy rain possible | 25° /17° | 1.2 mm | 6 | |
| 8 Sept. | Patchy rain possible | 24° /17° | 0.3 mm | 6 | |
| 9 Sept. | Partly cloudy | 25° /17° | 0.6 mm | 6 | |
| 10 Sept. | Partly cloudy | 25° /18° | 0.1 mm | 6 | |
| 11 Sept. | Partly cloudy | 25° /17° | 0.1 mm | 6 | |
| 12 Sept. | Sunny | 25° /17° | 4.2 mm | 6 | |
| 13 Sept. | Sunny | 25° /18° | 6.6 mm | 6 | |
| 14 Sept. | Sunny | 25° /18° | 8.4 mm | 6 | |
| 15 Sept. | Sunny | 26° /18° | 0.8 mm | 6 | |
| 16 Sept. | Sunny | 26° /18° | 1.8 mm | 7 | |
| 17 Sept. | Sunny | 27° /18° | 2.2 mm | 7 | |
| 18 Sept. | Sunny | 26° /18° | 0 mm | 6 | |
| 19 Sept. | Sunny | 26° /18° | 1.4 mm | 6 | |
| 20 Sept. | Patchy rain possible | 25° /17° | 0.2 mm | 6 | |
| 21 Sept. | Sunny | 24° /17° | 1 mm | 6 | |
| 22 Sept. | Sunny | 25° /16° | 0.2 mm | 6 | |
| 23 Sept. |  Overcast | 24° /15° | 2.7 mm | 6 | |
| 24 Sept. | Patchy rain possible | 24° /16° | 0.5 mm | 6 | |
| 25 Sept. | Sunny | 24° /17° | 0.2 mm | 6 | |
| 26 Sept. | Sunny | 25° /16° | 0.6 mm | 6 | |
| 27 Sept. | Sunny | 24° /16° | 0.4 mm | 6 | |
| 28 Sept. | Sunny | 23° /16° | 0.5 mm | 6 | |
| 29 Sept. | Sunny | 26° /16° | 0.1 mm | 6 | |
| 30 Sept. | Sunny | 26° /17° | 0 mm | 7 | |
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Lisbon weather in September vs August vs October
| August | September | October | |
|---|---|---|---|
| Weather | Sunny | Sunny | Patchy rain possible |
| Temperatures | 27°/18° | 25°/17° | 23°/17° |
| Rainfall | 0 mm | 50 mm | 68 mm |
| Wind | 25.1 km/h | 21.6 km/h | 20.5 km/h |
| Humidity | 66% | 68% | 69% |
| Rainy days | 0 days | 13 days | 16 days |
| Dry days | 31 days | 17 days | 15 days |
Planning a trip to Lisbon? Discover the best time to visit
Lisbon in September - FAQ
Lisbon water temperatures in September
The average water temperature of the Atlantic Ocean near Lisbon in September is 17 °C. At the beginning of September temperatures are around 17.1 °C; by the end of the month they stay fairly steady and reach 17 °C.
- What is the water temperature in Lisbon in September?
- The average water temperature in Lisbon in September is 17 °C.
- Can you swim in Lisbon 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 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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