What September feels like in Porto
Early autumn arrives in Porto with September. Days are warm enough for short sleeves, and time outdoors is easy. After sunset it cools off noticeably — nights stay mild. High humidity makes the heat feel heavier and sticky, especially on still afternoons.
Rain in Porto in September
Most days stay dry; rain arrives about one day in 5. Rainy days are intense, averaging about 10.9 mm (0.4 in) — downpours rather than drizzle. Across the year Porto averages about 11.3 mm per rainy day, so September is typical.
Daylight and sunshine in September
Mid-month, Porto gets 12 h 32 min of daylight, from sunrise near 7:14 am to sunset near 7:46 pm. Compared with mid-August, the day has lost 1 h 20 min. The sun is out for roughly 86% of those daylight hours, so skies are mostly clear.
How September compares to the rest of the year
September is the 3rd warmest month of the year in Porto. Compared with August, afternoons are 1.4°C (2.5°F) cooler, with 48 mm more rain. The cooling trend carries on into October. The next month's average high: 20.9°C (69.6°F).
Who September suits
- Sightseeing: a good fit — daytime temperatures are fine for walking around.
- Parks & outdoor: a good fit — good conditions for sitting outside.
- Beach: less ideal — too many rainy days.
Tips for visiting Porto in September
Versatile Layers
Pack pieces you can take off by noon and put back on at dusk.
Rain Protection
A compact umbrella and a light waterproof jacket.
Sunglasses
Frequent sunshine — sunglasses and a light hat.
Quick questions
How warm is Porto in September?
Afternoons average 24.1°C (75.4°F) and nights about 15.9°C (60.6°F) — warm by most people's standards. It is the 3rd warmest month of the year.
Does it rain a lot in Porto in September?
Only moderately: roughly 6 wet days and 65 mm, usually moderate rain.
What should I wear in Porto in September?
Pack versatile layers, rain protection and sunglasses. Bring something extra for the cooler evenings.
Is September or October better for visiting Porto?
September scores better on our climate ranking (#3 of 12 vs #6), rated Great against Good. October is cooler and has more rainy days.