The climate in Porto during September can be summarized as warm and reasonably dry.
September is in the fall / autumn in Porto and is typically the 3rd warmest month of the year. Daytime maximum temperatures average around 24°C (76°F), whilst at night 14°C (57°F) is normal.
|Daytime temperature||24.2°C 75.6°F|
|Nightly temperature||13.8°C 56.8°F|
|Average temperature||19°C 66.2°F|
|Daily sunshine||8.1 hrs|
|Avg rainfall||62 mm 2.4 ins|
|Rainy days||8 days|
|Sea temperature||18.5°C 65.3°F|
|Windspeed||13.7kph 9 mph|
On average September is the 4th driest month of the year in Porto with around 62mm 2.4 inches of rain making it a reasonably dry time to visit. This rainfall is typically spread over 8 days, although this may vary considerably.
On the flip side this corresponds to an average of 8.1 hours of sunshine per day.
The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in September 2020.
|Hottest month:||July||24.8°C 76.6°F|
|Driest month:||July||15mm 0.6ins|
|Coldest month:||January||13.3°C 55.9°F|
|Wettest month:||December||171mm 6.7ins|