Weather in Rio de Janeiro in December
December in Rio de Janeiro is warm with average temperatures around 25.1°C (77.2°F). Expect significant rainfall with 232mm across approximately 20 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
27.7°C
81.9°F
Low
22.6°C
72.7°F
Precipitation
232 mm
9.1 inches
~20 rainy days
Conditions
Humidity
84%
Comparison to Adjacent Months
December is 25mm wetter than January.