Monthly climate guide
Lisbon weather in September
With highs near 23°C (73°F) and lows around 18°C (64°F), September feels warm in Lisbon. Rainfall averages about 21 mm (fairly dry) and the sky is a mix of sun and cloud. Daytime highs are about the same as August and 2°C warmer than October.
What stands out in September
- It's one of the sunniest months here, with cloud cover around 48%.
- It's one of the drier months, with about 49% less rain than Lisbon's average.
- September is Lisbon's second warmest month.
- Days and nights are close, only about 5°C apart.
Avg high
23°C
73°F
Avg low
18°C
64°F
Rainfall
21 mm
fairly dry
Humidity
80%
relative
Sky
48%
cloud · a mix of sun and cloud
Lisbon weather by month
Show the monthly averages as a table
| Month | Avg high | Avg low | Rain | Humidity | Cloud cover |
|---|---|---|---|---|---|
| January | 15°C / 59°F | 11°C / 53°F | 55 mm | 81% | 64% |
| February | 15°C / 59°F | 11°C / 51°F | 37 mm | 79% | 58% |
| March | 16°C / 60°F | 12°C / 53°F | 63 mm | 79% | 59% |
| April | 17°C / 63°F | 13°C / 56°F | 61 mm | 80% | 60% |
| May | 20°C / 67°F | 15°C / 59°F | 36 mm | 79% | 53% |
| June | 21°C / 70°F | 17°C / 62°F | 7 mm | 79% | 50% |
| July | 22°C / 72°F | 18°C / 64°F | 3 mm | 81% | 49% |
| August | 23°C / 74°F | 18°C / 65°F | 4 mm | 81% | 42% |
| September | 23°C / 73°F | 18°C / 64°F | 21 mm | 80% | 48% |
| October | 21°C / 70°F | 17°C / 62°F | 63 mm | 80% | 59% |
| November | 18°C / 64°F | 14°C / 57°F | 98 mm | 81% | 63% |
| December | 16°C / 60°F | 12°C / 54°F | 49 mm | 82% | 61% |
What to pack for September
- T-shirts plus a light layer for the evening
- Comfortable trainers or sandals for long walks
Is September a good time to visit Lisbon?
Our Lisbon guide recommends: March to May or September to October, avoiding the hottest and most crowded summer months.
Ride Tram 28 through the old town for classic views — but expect it to be crowded; an early morning ride avoids the worst of it.
Best time to visit Lisbon →Other Portugal cities in September
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Lisbon weather in September. WeatherCompare, 2026 (NASA POWER / ERA5, 2011–2020 monthly averages). https://weathercompare.eu/weather/portugal/lisbon/september
<a href="https://weathercompare.eu/weather/portugal/lisbon/september">Lisbon weather in September</a> (WeatherCompare)
<iframe src="https://weathercompare.eu/embed/portugal/lisbon" width="300" height="160" style="border:0;border-radius:12px" loading="lazy" title="Lisbon weather in September"></iframe> <p style="font-size:12px"><a href="https://weathercompare.eu/weather/portugal/lisbon/september">Lisbon weather in September</a> – WeatherCompare</p>
Lisbon in September: quick answers
Is September a good time to visit Lisbon?
September is a reasonable time for Lisbon: highs around 23°C and about 21 mm of rain, though not one of the three best months.
How warm is Lisbon in September?
Average highs are about 23°C (73°F) and average lows about 18°C (64°F), based on 10 years of daily data.
Does it rain a lot in Lisbon in September?
Lisbon typically gets around 21 mm of rain in September — fairly dry.
When is the best time to visit Lisbon?
March to May or September to October, avoiding the hottest and most crowded summer months.
Figures are long-term averages for the area around Lisbon (NASA POWER / ERA5, 2011–2020), not a forecast for a specific year. For upcoming days, see the live multi-source forecast.