Rio Claro Weather in September
What's the weather like in Rio Claro (Mayaro) in September 2025?
The climate in Rio Claro during September can be summarized as hot, humid and wet.
September is in the fall / autumn in Rio Claro and is typically the warmest month of the year. Daytime maximum temperatures average around a steamy 31°C (88°F), whilst at night 22°C (72°F) is normal.
| Daytime temperature | 31.2°C 88.2°F |
|---|---|
| Nightly temperature | 22.4°C 72.3°F |
| Average temperature | 26.8°C 80.2°F |
| Daily sunshine | 7 hrs |
| Avg rainfall | 199 mm 7.9 ins |
| Rainy days | 18 days |
| Sea temperature | 28.9°C 84°F |
| Humidity | 84% |
| Windspeed | 7.2kph 5 mph |
On average September is the 6th driest month of the year in Rio Claro with around 199mm 7.9 inches of rain making it a wet time to visit. This rainfall is typically spread over 18 days, although this may vary considerably.
On the flip side this corresponds to an average of 7 hours of sunshine per day.
September temperatures in Rio Claro
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 Rio Claro in September 2025.
Other monthly averages
Best places to visit in September
Rio Claro weather stats
| Hottest month: | May | 30.9°C 87.6°F |
|---|---|---|
| Driest month: | March | 55mm 2.2ins |
| Sunniest month: | February | 8.3hrs |
| Coldest month: | January | 29.3°C 84.7°F |
| Wettest month: | June | 285mm 11.2ins |
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