Weather in Johannesburg in January
January in Johannesburg is mild with average temperatures around 21.8°C (71.2°F). Expect significant rainfall with 123mm 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
28.4°C
83.1°F
Low
15.3°C
59.5°F
Precipitation
123 mm
4.8 inches
~20 rainy days
Conditions
Humidity
65%
Comparison to Adjacent Months
January is 41mm wetter than February.