Updated: Sunday, 17 May 2026 04:24 AM SAST 
Day High Temp (°C) Low Temp (°C) Mean Temp (°C) Dewpoint Temp (°C) Humidity (%) Wind Speed (km/h) Precipitation (mm)
Forcast Dep. Forcast Dep. Forcast Dep. Forcast Dep. Forcast Dep. Forcast Dep. Forcast Dep.
Sun, May 17 19 -0.7 7 +3.7 13 +1.5 2 -2.3 33 -22.9 2 -5.4 --
Mon, May 18 20 -2.7 9 +2.3 14 -0.1 1 -0.5 30 -11.1 6 -5.0 +1.0
Tue, May 19 17 -3.0 9 +1.6 13 -0.7 5 -1.7 48 -17.3 10 -5.9 1mm +0.7
Wed, May 20 18 -0.7 7 +2.0 13 +0.6 2 -0.1 34 -18.5 7 -2.1 <1mm -0.8
Thu, May 21 19 -0.3 8 +5.5 14 +2.6 5 +2.8 41 -12.5 14 +4.2 <1mm -1.6
Fri, May 22 19 +0.9 9 +4.9 14 +2.8 5 -0.3 42 -21.7 16 +0.8 --
Sat, May 23 20 +2.6 12 +4.5 16 +3.5 3 -1.0 33 -27.1 13 -4.9 <1mm --
Sun, May 24 22 +3.2 11 +5.3 16 +4.2 7 +2.0 39 -19.2 12 +1.6 <1mm --
Mon, May 25 22 +3.5 10 +4.8 16 +4.1 5 -3.9 32 -29.7 18 -0.9 -0.8
Tue, May 26 23 +4.7 10 +5.6 16 +5.1 2 -0.3 26 -24.4 13 0 -1.4
Wed, May 27 24 +6.1 10 +6.8 17 +6.5 5 +1.9 30 -23.4 20 -1.3 -0.5
Thu, May 28 23 +6.1 10 +7.5 16 +6.8 4 +1.6 32 -24.8 23 -3.1 --
Fri, May 29 20 +5.8 8 +6.8 14 +6.3 -8 +7.0 15 -14.4 19 -1.1 --
Sat, May 30 16 +4.8 6 +6.3 11 +5.6 1 +8.2 42 -9.5 10 +1.6 2mm --
The values above are the forecast deviations from normal for the day. The deviations are derived from a 10-year average between 2001 and 2010 for Johannesburg, South Africa.