Weather in Lisbon for September 2026
Yellow High Temperature Warning - See hour by hour.
So far, September 2026 in Lisbon shows a warmer trend than usual by 2.2 °C.
The forecast for the next days in Lisbon predicts temperatures to be around 29 °C, close to the historical average.
In general, the average temperature in Lisbon at the beginning of September is 25.7 °C. As the month progressed, temperatures tended to moderately rise, reaching an average of 27.4 °C by the end of September.
With an average of 5 rainy days, Lisbon experiences minimal rainfall in September.
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. |  Sunny | 25° /16° | 1.2 mm | 6 | |
| 3 Sept. | Sunny | 26° /17° | 2.4 mm | 6 | |
| 4 Sept. | Sunny | 27° /17° | 2 mm | 6 | |
| 5 Sept. |  Partly cloudy | 26° /18° | 0.7 mm | 6 | |
| 6 Sept. | Partly cloudy | 25° /17° | 0 mm | 6 | |
| 7 Sept. | Patchy rain possible | 26° /17° | 1 mm | 6 | |
| 8 Sept. | Patchy rain possible | 25° /17° | 0.3 mm | 6 | |
| 9 Sept. | Sunny | 25° /17° | 0.5 mm | 6 | |
| 10 Sept. |  Cloudy | 26° /17° | 0.1 mm | 6 | |
| 11 Sept. | Sunny | 26° /17° | 0.1 mm | 7 | |
| 12 Sept. | Sunny | 26° /17° | 3.5 mm | 6 | |
| 13 Sept. | Sunny | 27° /18° | 5.5 mm | 6 | |
| 14 Sept. | Sunny | 26° /19° | 7 mm | 6 | |
| 15 Sept. | Sunny | 26° /18° | 0.6 mm | 6 | |
| 16 Sept. | Sunny | 26° /17° | 1.5 mm | 7 | |
| 17 Sept. | Sunny | 27° /17° | 1.8 mm | 7 | |
| 18 Sept. | Sunny | 26° /18° | 0 mm | 6 | |
| 19 Sept. | Sunny | 26° /18° | 1.2 mm | 6 | |
| 20 Sept. | Patchy rain possible | 25° /17° | 0.2 mm | 6 | |
| 21 Sept. | Sunny | 33° /22° | 0 mm | 6.5 | |
| 22 Sept. | Sunny | 32° /23° | 0 mm | 6.4 | |
| 23 Sept. | Sunny | 34° /22° | 0 mm | 6.1 | |
| 24 Sept. | Sunny | 31° /20° | 0 mm | 6.2 | |
| 25 Sept. |  Overcast | 27° /18° | 0 mm | 6 | |
| 26 Sept. | Overcast | 26° /18° | 0 mm | 6 | |
| 27 Sept. | Overcast | 23° /18° | 0 mm | 5 | |
| 28 Sept. | Sunny | 25° /16° | 0 mm | 6 | |
| 29 Sept. | Sunny | 29° /16° | 0 mm | 7 | |
| 30 Sept. | Sunny | 31° /20° | 0 mm | 8 | |
| Next | |||||
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 | 42 mm | 61 mm |
| Wind | 24.7 km/h | 22.2 km/h | 20.1 km/h |
| Humidity | 65% | 67% | 69% |
| Rainy days | 0 days | 5 days | 10 days |
| Dry days | 31 days | 25 days | 22 days |
Planning a trip to Lisbon? Discover the best time to visit
Lisbon in September - FAQ
What are the expected maximum and minimum temperatures in Lisbon during September?
How much rainfall should be expected in Lisbon during September?
What are the typical wind conditions in Lisbon during September?
Lisbon water temperatures in September
The average water temperature of the Atlantic Ocean near Lisbon in September is 17.8 °C. At the beginning of September temperatures are around 18.1 °C; by the end of the month they get a bit cooler and reach 17.2 °C.
- What is the water temperature in Lisbon in September?
- The average water temperature in Lisbon in September is 17.8 °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.
September rainfall patterns in Lisbon
UV exposure in Lisbon during September
What to pack to Lisbon in September?
Mild & changeable · highs around 25 °C, occasional showers
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
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