Porto Weather in September
What's the weather like in Porto (Piauí) in September 2025?
The climate in Porto during September can be summarized as very hot and dry.
September is in the spring in Porto and is typically the 4th warmest month of the year. Daytime maximum temperatures average around a warm 33°C (92°F), whilst at night 23°C (73°F) is normal.
| Daytime temperature | 33.4°C 92°F |
|---|---|
| Nightly temperature | 22.9°C 73.1°F |
| Average temperature | 28.1°C 82.6°F |
| Daily sunshine | 9.5 hrs |
| Avg rainfall | 11 mm 0.4 ins |
| Rainy days | 9 days |
| Sea temperature | 26.8°C 80.2°F |
| Humidity | 65% |
| Windspeed | 13.3kph 8 mph |
On average September is the 2nd driest month of the year in Porto with around 11mm 0.4 inches of rain making it a dry time to visit. This rainfall is typically spread over 9 days, although this may vary considerably.
On the flip side this corresponds to an average of 9.5 hours of sunshine per day.
September temperatures in Porto
September rainfall
September hourly sunshine
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 Porto in September 2025.
Other monthly averages
Best places to visit in September
Porto weather stats
| Hottest month: | October | 33.5°C 92.3°F |
|---|---|---|
| Driest month: | August | 9mm 0.4ins |
| Sunniest month: | August | 10hrs |
| Coldest month: | February | 30.6°C 87.1°F |
| Wettest month: | March | 407mm 16ins |
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