Weather in Rio de Janeiro in September
September in Rio de Janeiro is mild with average temperatures around 22.6°C (72.7°F). Moderate rainfall of 69mm spread over 10 days.
Data Note: Temperature values are 2001–2020 satellite/reanalysis grid averages from NASA POWER and may differ from airport station normals by a few degrees.
Temperature
High
26.0°C
78.8°F
Low
19.2°C
66.6°F
Precipitation
69 mm
2.7 inches
~10 rainy days
Conditions
Humidity
77%
Comparison to Adjacent Months
September is 27mm wetter than August.
September is 39mm drier than October.