Johannesburg monthly weather averages

Average daytime temperature

The bar chart below shows the average monthly peak daytime temperatures at Johannesburg

Johannesburg average temperature chart (Celsius) Johannesburg average temperature chart (Fahrenheit)
Average monthly temperatures in Johannesburg (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 26.1 25.3 24.4 21.7 19.4 16.4 17.1 19.8 22.9 23.9 24.6 25.6
°F 79 77.6 76 71 66.9 61.5 62.8 67.6 73.2 75.1 76.2 78

Please note: these are the average peak daytime temperatures (usually around mid-afternoon) so do not show daytime / night highs and lows. To see the daily range of temperatures have a look at the temperature max / min chart below.

Average rainfall & rainy days

The graph below shows the average rainfall and number of rainy days per month.

Johannesburg monthly rainfall chart (mm) Johannesburg monthly rainfall chart (inches)
Average monthly rainfall in Johannesburg (mm and inches)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
mm 135 93 92 56 15 9 4 8 28 76 112 113
inches 5.3 3.7 3.6 2.2 0.6 0.3 0.1 0.3 1.1 3 4.4 4.4
Rainy days 14 10 11 8 3 2 1 2 3 9 13 14

Average daily sunshine

The bar chart below shows the average daily sunshine hours in Johannesburg

Johannesburg average daily sunshine chart
Average daily sunshine Johannesburg
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Hrs sunshine 8.8 8.8 8.4 8.5 9.6 9.5 10 10.4 10.3 9.5 9 9.4

Day / night temperatures

The graph below shows the daily range of temperatures for each month.

Johannesburg average minimum / maximum temperatures (Celsius) Johannesburg average minimum / maximum temperatures (Fahrenheit)
Maximum and minimum daily temperatures in Johannesburg (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Min °C 15.2 14.6 13.3 10.1 6.3 2.9 3 5.5 9.2 11.6 13.2 14.4
Max °C 26.4 25.6 24.7 22 19.7 16.7 17.5 20.1 23.2 24.3 24.9 25.9
Min °F 59.4 58.3 55.9 50.1 43.3 37.2 37.3 41.9 48.6 52.8 55.7 57.8
Max °F 69.4 68.2 66.2 60.8 55.4 49.6 50.4 55 61.2 64.2 66.2 68.2

Sea temperature

The graph below shows the average sea temperature.

Johannesburg average sea temperature chart (Celsius) Johannesburg average sea temperature chart (Fahrenheit)
Average sea temperature around Johannesburg in degrees centigrade and fahrenheit
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 24.7 25.1 24.8 23.9 22.7 21.5 20.7 20.4 20.6 21.3 22.4 23.7
°F 76.4 77.1 76.6 75 72.8 70.7 69.2 68.7 69 70.3 72.3 74.6

Wind speed

The graph below shows the average wind speed.

Johannesburg average winspeed by month (km/h) Johannesburg average winspeed by month (mph)
Average wind speed in Johannesburg (mph and kmh)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
km/h 9 8 8 8 8 9 9 10 12 13 12 10
mph 6 5 5 5 5 5 5 7 8 8 7 6

A monthly average windspeed of over 16km/h or 10mph suggests a location is fairly windy.

Relative humidity

The graph below shows the average relative humidity.

Johannesburg relative humidity averages
Average relative humidity in Johannesburg
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
66% 67% 66% 64% 56% 53% 50% 46% 47% 55% 62% 63%

Other monthly averages

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Johannesburg weather stats

Johannesburg weather statistics
Hottest month: January 26.1°C 79°F
Driest month: July 4mm 0.2ins
Sunniest month: July 10hrs
Coldest month: June 16.4°C 61.5°F
Wettest month: January 135mm 5.3ins
Warmest sea: February 25.1°C 77.2°F
Map showing location of Johannesburg (-26.20227, 28.04363)

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