Niterói Weather in September
What's the weather like in Niterói (Rio de Janeiro) in September 2025?
The climate in Niterói during September can be summarized as warm, humid and reasonably dry.
September is in the spring in Niterói and is typically the 4th coldest month of the year. Daytime maximum temperatures average around a muggy 26°C (78°F), whilst at night 18°C (64°F) is normal.
| Daytime temperature | 25.8°C 78.4°F |
|---|---|
| Nightly temperature | 17.8°C 64°F |
| Average temperature | 21.8°C 71.2°F |
| Daily sunshine | 5.1 hrs |
| Avg rainfall | 64 mm 2.5 ins |
| Rainy days | 12 days |
| Sea temperature | 21.9°C 71.5°F |
| Humidity | 78% |
| Windspeed | 9kph 6 mph |
On average September is the 4th driest month of the year in Niterói with around 64mm 2.5 inches of rain making it a reasonably dry time to visit. This rainfall is typically spread over 12 days, although this may vary considerably.
On the flip side this corresponds to an average of 5.1 hours of sunshine per day.
September temperatures in Niterói
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 Niterói in September 2025.
Other monthly averages
Best places to visit in September
Niterói weather stats
| Hottest month: | February | 30.8°C 87.4°F |
|---|---|---|
| Driest month: | July | 52mm 2ins |
| Sunniest month: | August | 6.5hrs |
| Coldest month: | July | 25.1°C 77.2°F |
| Wettest month: | January | 146mm 5.7ins |
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