This reference page collects johannesburg climate: monthly averages in one place: annual mean temperature 17.1 C; warmest month Jan (21.6 C); coldest month Jul (9.9 C); wettest month Dec (4.09 mm/day). Figures are refreshed automatically by a scheduled build and cached locally so the page keeps its values even when the upstream API is temporarily unavailable. Use the table below for exact numbers, or the related pages for the same dataset for neighbouring periods and locations.
Annual mean temperature 17.1 C
Warmest month Jan (21.6 C)
Coldest month Jul (9.9 C)
Wettest month Dec (4.09 mm/day)
All-time record high 38.8 C
All-time record low -4.8 C
Annual precipitation 642 mm / year
Coordinates -26.2041, 28.0473
Population 5,900,000
Average monthly temperature and rainfall in Johannesburg
Month
Mean temp (C)
Rain (mm/day)
Record high (C)
Record low (C)
Jan
21.6
3.95
38.8
7.0
Feb
21.4
2.90
35.1
8.8
Mar
19.9
2.36
33.8
6.1
Apr
16.7
1.44
31.4
1.0
May
13.3
0.51
29.3
-4.2
Jun
10.0
0.23
25.4
-4.8
Jul
9.9
0.09
25.8
-4.0
Aug
13.1
0.23
29.8
-4.2
Sep
17.3
0.53
33.4
-1.5
Oct
19.9
1.83
36.7
2.9
Nov
20.7
2.97
36.9
5.0
Dec
21.4
4.09
36.5
6.5
What the Johannesburg climate table shows
Values are multi-decadal climatological averages for the -26.2041, 28.0473 grid cell, not a single year. Rain is the daily mean, so a value of 2.00 mm/day is about 60 mm across a 30-day month. Averages smooth over extremes, so use them for planning rather than for what to pack for next Tuesday.
Frequently asked questions
Where does the data on johannesburg climate: monthly averages come from?
From a public open API that is queried automatically and cached after every successful run.
How often is johannesburg climate: monthly averages updated?
The build runs on a schedule, so values refresh at least daily and old pages stay live.