This page is a single place to check Germiston climate: monthly averages. Germiston runs from 9.9 C in Jul to 21.6 C in Jan, a swing of 11.7 C. Rain is strongly seasonal: Dec is the wettest month at 4.09 mm/day, while Jul runs at 0.09 mm/day, about 45.4x drier. Taken together that is roughly 642 mm of rain a year for the grid cell. The build runs on a schedule and caches the last good response, so the numbers stay put even when the upstream API is having a bad day. Use the table for exact numbers, or the related pages below for neighbouring locations and periods.
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 -26.215, 28.164
Population 255,863
Average monthly temperature and rainfall in Germiston
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 Germiston climate table shows
Values are multi-decadal climatological averages for the -26.215, 28.164 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
How much rain is 4.09 mm/day in a month?
Rain is recorded as a daily mean, so 4.09 mm/day is roughly 124 mm across a 30-day month.
Does Germiston get the same every year?
Close to it. Averaging decades smooths variation, so treat these as typical rather than guaranteed.