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Rio de Janeiro weather in September 2025
Expect 77°F daytime maximum temperatures in the shade with on average 5 hours of sunshine per day in Rio de Janeiro in September based on long-term weather averages. There is usually 11 days with some rainfall and 96 inches of average monthly rainfall in September.
- 77°F max day temperature
77
- 5 hours of sunshine per day
- 11 days with some rainfall
11
- 63°F min night temperature
63
- 12 hours of daylight per day
12
- Low heat & humidity
L
- 3.8 inches of monthly rainfall
3.8
- 10 (Very High) UV index
10
- 70°F sea temperature
70
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The September weather guide for Brazil (Rio de Janeiro) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.
Metric (°C) | Imperial (°F)
More about Brazil
How hot is it in Rio de Janeiro in September?
Daytime temperatures usually reach 77°F in Rio de Janeiro in September with low heat and humidity, falling to 63°F at night.
How sunny is it in Rio de Janeiro in September?
There are normally 5 hours of bright sunshine each day in Rio de Janeiro in September - that's 40% of daylight hours.
How warm is the sea around Rio de Janeiro in September?
The average sea temperature around Rio de Janeiro in September is 70°F.
Does it rain in Rio de Janeiro in September?
There are usually 11 days with some rain in Rio de Janeiro in September and the average monthly rainfall is 3.8 inches.
Rio de Janeiro September sunrise & sunset times
Browse the sunrise and sunset times for Rio de Janeiro in September 2025. Select a month to view Rio de Janeiro sunrise and sunset times for the next 12 months.
JanFebMarAprMayJunJulAugSepOctNovDec
Date | Sunrise times | Sunset times |
---|---|---|
Monday, 1st September 2025 | 06:03 | 17:43 |
Monday, 15th September 2025 | 05:49 | 17:47 |
Tuesday, 30th September 2025 | 05:34 | 17:52 |
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