Annual mean 18°C · wettest around December · prevailing wind NW
Warmest
25.5 °C
Coldest
16.3 °C
Wettest
75%
Windiest
4.0 m/s
Prevailing
NW
3.1 m/s average
When this place is good five ratings · thirty-six ten-day sections · click a cell to read it
never good
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Every reading
bars actual · line feels-like, °Cchance of rain, %wind speed, m/ssky covered, %
The average temperature in Johannesburg over the whole year is 18°C. January is the hottest month, with highs of about 25°C; July is the coldest, with lows of about 5°C. The rainy (wet) season in Johannesburg runs from October to May, peaking in December with a 56% chance of rain on a given day. The dry season is June to September; August is the driest month, at 26%. Winds in Johannesburg are highest in October, averaging 2.9 m/s (10 km/h), and lightest in April, at 1.9 m/s (7 km/h). The prevailing wind is from the NW. The clearest skies in Johannesburg come in July, when the sky is typically 25% covered; February is the cloudiest month, at 58%.
Month by month Johannesburg climate by month: average temperatures year round · click a month to read it
Month
High
Low
Feels like
Chance of rain
Cloud
Wind
Being outside
Sun
Walking
January
25°C
17°C
24°C
53%
55%
2.6 m/s
76
48
34
February
25°C
17°C
25°C
52%
58%
2.3 m/s
74
51
31
March
24°C
16°C
23°C
53%
49%
2.1 m/s
81
39
43
April
22°C
13°C
20°C
49%
46%
1.9 m/s
83
13
69
May
19°C
9°C
17°C
50%
33%
1.9 m/s
69
1
83
June
17°C
5°C
13°C
36%
25%
2.1 m/s
37
0
82
July
17°C
5°C
13°C
31%
25%
2.0 m/s
35
0
81
August
20°C
8°C
15°C
26%
27%
2.5 m/s
59
0
82
September
23°C
12°C
19°C
40%
38%
2.7 m/s
79
13
67
October
24°C
14°C
21°C
52%
48%
2.9 m/s
73
28
53
November
25°C
16°C
22°C
53%
51%
2.9 m/s
74
35
47
December
25°C
18°C
24°C
56%
58%
2.8 m/s
73
45
37
High and low are the warmest and coolest of four readings a day — midnight, 6am, noon and 6pm — so a true overnight low can sit a degree or two under them. Chance of rain, cloud and wind are the day’s average; feels-like and the three ratings (each out of 100: Good from 55, Ideal from 80) are read at midday.
Seasons, and the year in short Johannesburg weather by season
Year round, Johannesburg has days of about 17°C at their warmest in July, its coolest month, and 25°C in January, its warmest; the coolest hours of the day run from 5°C to 18°C through the year, and the average temperature over the year is 18°C around the clock. Rain is most likely around December and least likely around August. Every figure here is a decade of observations blended into one representative year, so it reads as what this date is usually like, not a forecast for one particular day.
Johannesburg weather in winterJune to August
High 18°CLow 6°CRain 31%
Winter in Johannesburg has typical daily highs of about 18°C and lows of about 6°C, with a 31% chance of rain on a given day.
Johannesburg weather in springSeptember to November
High 24°CLow 14°CRain 48%
Spring in Johannesburg has typical daily highs of about 24°C and lows of about 14°C, with a 48% chance of rain on a given day.
Johannesburg weather in summerDecember to February
High 25°CLow 17°CRain 54%
Summer in Johannesburg has typical daily highs of about 25°C and lows of about 17°C, with a 54% chance of rain on a given day.
Johannesburg weather in autumnMarch to May
High 22°CLow 12°CRain 51%
Autumn in Johannesburg has typical daily highs of about 22°C and lows of about 12°C, with a 51% chance of rain on a given day.
When is the rainy season in Johannesburg?
The rainy (wet) season in Johannesburg runs from October to May, peaking in December with a 56% chance of rain on a given day. The dry season is June to September; August is the driest month, at 26%.
What time of year is Johannesburg windiest?
Winds in Johannesburg are highest in October, averaging 2.9 m/s (10 km/h), and lightest in April, at 1.9 m/s (7 km/h). The prevailing wind is from the NW.
What is the average temperature in Johannesburg year round?
The average temperature in Johannesburg over the whole year is 18°C. January is the hottest month, with highs of about 25°C; July is the coldest, with lows of about 5°C.