Castelo do Piauí Weather in September
What's the weather like in Castelo do Piauí (Piauí) in September 2025?
The climate in Castelo do Piauí during September can be summarized as very hot and very dry.
September is in the spring in Castelo do Piauí and is typically the 3rd warmest month of the year. Daytime maximum temperatures average around a warm 35°C (95°F), whilst at night 22°C (71°F) is normal.
| Daytime temperature | 34.7°C 94.5°F |
|---|---|
| Nightly temperature | 21.9°C 71.4°F |
| Average temperature | 28.3°C 82.9°F |
| Daily sunshine | 9.1 hrs |
| Avg rainfall | 5 mm 0.2 ins |
| Rainy days | 12 days |
| Sea temperature | 26.2°C 79.1°F |
| Humidity | 49% |
| Windspeed | 13.7kph 9 mph |
On average September is the 2nd driest month of the year in Castelo do Piauí with around 5mm 0.2 inches of rain making it a very dry time to visit.
On the flip side this corresponds to an average of 9.1 hours of sunshine per day.
September temperatures in Castelo do Piauí
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 Castelo do Piauí in September 2025.
Other monthly averages
Best places to visit in September
Castelo do Piauí weather stats
| Hottest month: | October | 34.6°C 94.3°F |
|---|---|---|
| Driest month: | August | 4mm 0.2ins |
| Sunniest month: | August | 9.9hrs |
| Coldest month: | May | 30.2°C 86.4°F |
| Wettest month: | March | 275mm 10.8ins |
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