Verdict: Excellent month
Porto Weather in September
September hits the sweet spot in Porto — highs around 23°C (73°F), ideal for a full day on foot. Rain is occasional — about 8 wet days in a typical year. Overall, September is one of the best months of the year to be in Porto.
Average high
23°C / 73°F
Average low
16°C / 61°F
Rain days
~8
Precipitation
99 mm
What to pack for Porto in September
- Summer clothes, plus one light layer for air-con and evenings
- A packable rain shell or compact umbrella earns its space
- Comfortable walking shoes — every guide on this site assumes you'll use them
September against the rest of the year
Warmest in Porto: Jul (24°C / 75°F) · Coolest: Jan (14°C / 57°F) · Wettest: Oct (~16 rain days)
14°
7°
Jan
16°
9°
Feb
16°
9°
Mar
18°
11°
Apr
20°
13°
May
22°
15°
Jun
24°
16°
Jul
24°
16°
Aug
23°
16°
Sep
21°
14°
Oct
17°
11°
Nov
15°
9°
Dec
Daily highs / lows in °C · bars show rain days per month · ERA5 climate normals (2020–2024)