Rio Negro Weather in September
What's the weather like in Rio Negro (Paraná) in September 2025?
The climate in Rio Negro during September can be summarized as mild and wet.
September is in the spring in Rio Negro and is typically the 5th coldest month of the year. Daytime maximum temperatures average around 22°C (71°F), whilst at night 10°C (50°F) is normal.
| Daytime temperature | 21.5°C 70.7°F |
|---|---|
| Nightly temperature | 10.1°C 50.2°F |
| Average temperature | 15.8°C 60.4°F |
| Daily sunshine | 2.7 hrs |
| Avg rainfall | 121 mm 4.8 ins |
| Rainy days | 18 days |
| Sea temperature | 19.4°C 66.9°F |
| Humidity | 82% |
| Windspeed | 10.1kph 6 mph |
On average September is the 6th wettest month of the year in Rio Negro with around 121mm 4.8 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 2.7 hours of sunshine per day.
September temperatures in Rio Negro
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 Negro in September 2025.
Other monthly averages
Best places to visit in September
Rio Negro weather stats
| Hottest month: | February | 26.5°C 79.7°F |
|---|---|---|
| Driest month: | April | 76mm 3ins |
| Sunniest month: | June | 3.3hrs |
| Coldest month: | July | 18.9°C 66°F |
| Wettest month: | February | 166mm 6.5ins |
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