Weather in Johannesburg in December
December in Johannesburg is mild with average temperatures around 21.7°C (71.1°F). Expect significant rainfall with 127mm 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
28.3°C
82.9°F
Low
15.0°C
59.0°F
Precipitation
127 mm
5.0 inches
~20 rainy days
Conditions
Humidity
63%
Comparison to Adjacent Months
December is 38mm wetter than November.