September in Porto averages highs of 24 °C (74 °F) and lows of 16 °C (60 °F), with about 5 rainy days and 12 h 24 min of daylight. The sea is cold, around 16 °C (61 °F).
September weather in Porto at a glance
average high to low each dot ≈ 3 rainy days
Is September a good time to visit Porto?
Great time to go: comfortably warm and fairly dry. September is usually high season in Porto: book rooms early, as prices are typically at their highest.
Our rule: a month scores 2 points for comfortable average highs of 18–28 °C (1 point for 14–18 or 28–32 °C) and 2 points for 5 or fewer rainy days (1 point for 6–10). Average highs above 35 °C or below 8 °C make it a tough month whatever the rain. A rainy day here means 2 mm of rain or more. 4 points = great, 3 = good, 2 = mixed, 0–1 = tough.
Holidays and events in September 2026
No public holidays fall in September 2026 in Portugal, so opening hours should be normal.
Things to do in Porto in September
September's weather suits a mix of outdoor sights and museums, so the open-air ones come first.
- Ribeira and the Dom Luís I bridge — walk the top deck at sunset outdoors
- Foz do Douro — ocean promenade and lighthouse outdoors
- Douro Valley day trip — vineyards and river views outdoors
- Port cellars in Vila Nova de Gaia — tastings across the river indoors
- Livraria Lello and Clérigos Tower — book ahead for both indoors
- São Bento station tiles — 20,000 azulejos in the hall indoors
Where to stay: Ribeira and Baixa for sights on foot; Cedofeita for cafés; Foz for the ocean.
What to pack for Porto in September
- Light layers for the day.
- Comfortable walking shoes.
What a day in Porto costs
| Budget traveller | Mid-range | |
|---|---|---|
| Typical total per person, per day | €50–110 | €140–280 |
Excluding flights. September is usually high season in Porto: book rooms early, as prices are typically at their highest.
September in nearby cities
| City | High / low | Rainy days | Verdict |
|---|---|---|---|
| Lisbon | 26° / 17° | 3 | Great time to go |
| Madrid | 27° / 15° | 4 | Great time to go |
| Seville | 32° / 19° | 2 | Good time to go |
Plan your Porto trip
- Romantic Weekend in Porto: 2-Day Plan for Couples (2026)
- How to Plan a Trip in 10 Minutes (2026 Step-by-Step)
- Best Time to Visit Portugal: Month-by-Month Guide 2026
Want the whole trip planned? Join the Journey waitlist: tell it where, when and your budget, and it plans every day hour by hour.
FAQ
Is September a good time to visit Porto?
By the numbers, September is a great time to go: comfortably warm and fairly dry, with average highs of 24 °C (74 °F) and about 5 rainy days. September is usually high season in Porto: book rooms early, as prices are typically at their highest. The best months for weather are July, August, September.
How warm is Porto in September?
Average highs are 24 °C (74 °F) and lows 16 °C (60 °F) (2015–2024 averages). The sea is cold, around 16 °C (61 °F).
Does it rain a lot in Porto in September?
Expect about 5 days with 2 mm of rain or more, about 68 mm in total. It is the 3rd driest month of the year in Porto.
Sources: climate averages from Open-Meteo historical weather (ERA5 reanalysis, 2015–2024); sea temperatures from the Open-Meteo marine API (2023–2024); public holidays from Nager.Date. Daylight is calculated for the 15th of the month. Averages are a guide, not a forecast. Costs are typical ranges per person per day, excluding flights.