Monthly climate guide
Porto weather in September
Expect warm weather in Porto in September: afternoons reach about 24°C (75°F), while nights drop to around 16°C (61°F). Around 52 mm of rain falls over the month (some rain), and skies are mostly sunny. Daytime highs are about the same as August and 3°C warmer than October.
What stands out in September
- Just 50 km apart, but Porto runs about 3°C cooler than Braga this month.
- In Porto, September is early autumn.
- Comfortable temperatures make it easy to walk between Ribeira District and Livraria Lello.
- Only 2 months are warmer in Porto than September.
Avg high
24°C
75°F
Avg low
16°C
61°F
Rainfall
52 mm
some rain
Humidity
73%
relative
Sky
34%
cloud · mostly sunny
Porto weather by month
Show the monthly averages as a table
| Month | Avg high | Avg low | Rain | Humidity | Cloud cover |
|---|---|---|---|---|---|
| January | 13°C / 56°F | 8°C / 47°F | 130 mm | 86% | 54% |
| February | 14°C / 56°F | 8°C / 46°F | 100 mm | 83% | 51% |
| March | 15°C / 60°F | 9°C / 48°F | 108 mm | 81% | 49% |
| April | 17°C / 63°F | 11°C / 52°F | 102 mm | 81% | 52% |
| May | 20°C / 68°F | 13°C / 55°F | 72 mm | 79% | 43% |
| June | 22°C / 71°F | 15°C / 58°F | 29 mm | 76% | 41% |
| July | 24°C / 76°F | 16°C / 61°F | 9 mm | 74% | 28% |
| August | 25°C / 76°F | 16°C / 61°F | 19 mm | 73% | 30% |
| September | 24°C / 75°F | 16°C / 61°F | 52 mm | 73% | 34% |
| October | 21°C / 70°F | 14°C / 58°F | 118 mm | 77% | 46% |
| November | 16°C / 61°F | 11°C / 52°F | 145 mm | 84% | 53% |
| December | 14°C / 58°F | 9°C / 49°F | 114 mm | 85% | 54% |
What to pack for September
- T-shirts plus a light layer for the evening
- Comfortable trainers or sandals for long walks
- A small travel umbrella, just in case
- Sunglasses
Is September a good time to visit Porto?
Our Porto guide recommends: May to June or September, for mild weather without peak summer crowds.
Cross the river to Vila Nova de Gaia for port wine cellar tours — most of the historic producers are based there, not in Porto itself.
Best time to visit Porto →Other Portugal cities in September
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Porto weather in September. WeatherCompare, 2026 (NASA POWER / ERA5, 2011–2020 monthly averages). https://weathercompare.eu/weather/portugal/porto/september
<a href="https://weathercompare.eu/weather/portugal/porto/september">Porto weather in September</a> (WeatherCompare)
<iframe src="https://weathercompare.eu/embed/portugal/porto" width="300" height="160" style="border:0;border-radius:12px" loading="lazy" title="Porto weather in September"></iframe> <p style="font-size:12px"><a href="https://weathercompare.eu/weather/portugal/porto/september">Porto weather in September</a> – WeatherCompare</p>
Porto in September: quick answers
Is September a good time to visit Porto?
September is a reasonable time for Porto: highs around 24°C and about 52 mm of rain, though not one of the three best months.
How warm is Porto in September?
Average highs are about 24°C (75°F) and average lows about 16°C (61°F), based on 10 years of daily data.
Does it rain a lot in Porto in September?
Porto typically gets around 52 mm of rain in September — some rain.
When is the best time to visit Porto?
May to June or September, for mild weather without peak summer crowds.
Figures are long-term averages for the area around Porto (NASA POWER / ERA5, 2011–2020), not a forecast for a specific year. For upcoming days, see the live multi-source forecast.