Johannesburg Weather

Johannesburg is situated on the highveld plateau, and has a subtropical highland climate . The city enjoys a sunny climate, with the summer months (October to April) characterised by hot days followed by afternoon thundershowers and cool evenings, and the winter months (May to September) by dry, sunny days followed by cold nights. Temperatures in Johannesburg are usually fairly mild due to the city’s high elevation, with an average maximum daytime temperature in January of 25.6 °C (78.1 °F), dropping to an average maximum of around 16 °C (61 °F) in June. The UV index for Johannesburg in summers is extreme, often reaching 14–16 due to the high elevation and its location in the subtropics.

Winter is the sunniest time of the year, with mild days and cool nights, dropping to 4.1 °C (39.4 °F) in June and July. The temperature occasionally drops to below freezing at night, causing frost. Snow is a rare occurrence, with snowfall having been experienced in the twentieth century during May 1956, August 1962, June 1964 and September 1981. In the 21st century, there was light sleet in 2006, as well as snow proper on 27 June 2007 (accumulating up to 10 centimetres or 4 inches in the southern suburbs) and 7 August 2012.

Regular cold fronts pass over in winter bringing very cold southerly winds but usually clear skies. The annual average rainfall is 713 millimetres (28.1 in), which is mostly concentrated in the summer months. Infrequent showers occur through the course of the winter months. The lowest nighttime minimum temperature ever recorded in Johannesburg is −8.2 °C (17.2 °F), on 13 June 1979. The lowest daytime maximum temperature recorded is 1.5 °C (34.7 °F), on 19 June 1964.

Average Temperature
Jan
79 °F
26 °C
Feb
76 °F
25 °C
Mar
79 °F
26 °C
Apr
70 °F
21 °C
May
68 °F
20 °C
Jun
63 °F
17 °C
Jul
63 °F
17 °C
Aug
70 °F
21 °C
Sep
74 °F
24 °C
Oct
79 °F
26 °C
Nov
79 °F
26 °C
Dec
75 °F
24 °C
Humidity
Jan
56%
Feb
63%
Mar
54%
Apr
58%
May
37%
Jun
30%
Jul
25%
Aug
35%
Sep
20%
Oct
30%
Nov
48%
Dec
63%
Rain
Jan
53mm
Feb
44mm
Mar
35mm
Apr
40mm
May
1mm
Jun
0mm
Jul
1mm
Aug
1mm
Sep
4mm
Oct
12mm
Nov
67mm
Dec
83mm
Clouds
Jan
30%
Feb
54%
Mar
23%
Apr
35%
May
1%
Jun
0%
Jul
0%
Aug
0%
Sep
1%
Oct
24%
Nov
39%
Dec
68%
Air quality US AQI
Jan
18
Feb
166
Mar
31
Apr
25
May
42
Jun
166
Jul
166
Aug
61
Sep
65
Oct
50
Nov
27
Dec
21
Sun
Jan
14UVI
Feb
11UVI
Mar
11UVI
Apr
8UVI
May
7UVI
Jun
6UVI
Jul
6UVI
Aug
7UVI
Sep
10UVI
Oct
12UVI
Nov
13UVI
Dec
9UVI