Solar radiation in Johannesburg / Rand Solar radiation 15 days
In the following list by days you can know the forecast of the predicted solar radiation. To know the data hour by hour, click on the day that interests you. If you have a solar panel system, these data will be useful to predict the energy it will produce.
The unit of measurement for solar radiation is expressed in W/m2 (Watts per square meter).
Solar radiation
Today, September 16
Total: 1758 wh/m2Hours07:0037 w/m2
08:0097 w/m2
09:00156 w/m2
10:00202 w/m2
11:00311 w/m2
12:00219 w/m2
13:00233 w/m2
14:00186 w/m2
15:00161 w/m2
16:00113 w/m2
17:0043 w/m2
Tomorrow, September 17
Total: 6085 wh/m2Hours07:00120 w/m2
08:00359 w/m2
09:00571 w/m2
10:00736 w/m2
11:00840 w/m2
12:00848 w/m2
13:00845 w/m2
14:00744 w/m2
15:00566 w/m2
16:00351 w/m2
17:00105 w/m2
Wednesday, September 18
Total: 6285 wh/m2Hours07:00132 w/m2
08:00365 w/m2
09:00578 w/m2
10:00744 w/m2
11:00850 w/m2
12:00888 w/m2
13:00855 w/m2
14:00753 w/m2
15:00591 w/m2
16:00381 w/m2
17:00148 w/m2
Thursday, September 19
Total: 6332 wh/m2Hours07:00136 w/m2
08:00371 w/m2
09:00583 w/m2
10:00749 w/m2
11:00855 w/m2
12:00893 w/m2
13:00859 w/m2
14:00757 w/m2
15:00595 w/m2
16:00384 w/m2
17:00150 w/m2
Friday, September 20
Total: 2825 wh/m2Hours07:0042 w/m2
08:00122 w/m2
09:00162 w/m2
10:00262 w/m2
11:00299 w/m2
12:00352 w/m2
13:00394 w/m2
14:00246 w/m2
15:00422 w/m2
16:00374 w/m2
17:00150 w/m2
Saturday, September 21
Total: 6404 wh/m2Hours07:00146 w/m2
08:00377 w/m2
09:00591 w/m2
10:00759 w/m2
11:00865 w/m2
12:00902 w/m2
13:00868 w/m2
14:00765 w/m2
15:00600 w/m2
16:00384 w/m2
17:00147 w/m2
Sunday, September 22
Total: 2293 wh/m2Hours07:0038 w/m2
08:0097 w/m2
09:00150 w/m2
10:00192 w/m2
11:00218 w/m2
12:00272 w/m2
13:00303 w/m2
14:00302 w/m2
15:00333 w/m2
16:00266 w/m2
17:00122 w/m2
Monday, September 23
Total: 2452 wh/m2Hours07:0039 w/m2
08:0098 w/m2
09:00167 w/m2
10:00231 w/m2
11:00284 w/m2
12:00337 w/m2
13:00363 w/m2
14:00352 w/m2
15:00289 w/m2
16:00204 w/m2
17:0088 w/m2
Tuesday, September 24
Total: 6567 wh/m2Hours07:00160 w/m2
08:00398 w/m2
09:00611 w/m2
10:00777 w/m2
11:00881 w/m2
12:00917 w/m2
13:00881 w/m2
14:00777 w/m2
15:00611 w/m2
16:00396 w/m2
17:00158 w/m2
Wednesday, September 25
Total: 6184 wh/m2Hours06:001 w/m2
07:00163 w/m2
08:00383 w/m2
09:00604 w/m2
10:00778 w/m2
11:00886 w/m2
12:00912 w/m2
13:00845 w/m2
14:00672 w/m2
15:00508 w/m2
16:00312 w/m2
17:00120 w/m2
Thursday, September 26
Total: 6484 wh/m2Hours06:001 w/m2
07:00131 w/m2
08:00346 w/m2
09:00582 w/m2
10:00771 w/m2
11:00888 w/m2
12:00922 w/m2
13:00885 w/m2
14:00780 w/m2
15:00614 w/m2
16:00400 w/m2
17:00164 w/m2
Friday, September 27
Total: 6670 wh/m2Hours06:001 w/m2
07:00175 w/m2
08:00416 w/m2
09:00628 w/m2
10:00793 w/m2
11:00896 w/m2
12:00930 w/m2
13:00889 w/m2
14:00775 w/m2
15:00607 w/m2
16:00396 w/m2
17:00163 w/m2
18:001 w/m2
Saturday, September 28
Total: 5401 wh/m2Hours06:002 w/m2
07:00182 w/m2
08:00421 w/m2
09:00634 w/m2
10:00798 w/m2
11:00901 w/m2
12:00917 w/m2
13:00758 w/m2
14:00345 w/m2
15:00245 w/m2
16:00143 w/m2
17:0055 w/m2
Sunday, September 29
Total: 4312 wh/m2Hours06:003 w/m2
07:00183 w/m2
08:00402 w/m2
09:00534 w/m2
10:00497 w/m2
11:00227 w/m2
12:00447 w/m2
13:00585 w/m2
14:00618 w/m2
15:00451 w/m2
16:00268 w/m2
17:0096 w/m2
18:001 w/m2
Monday, September 30
Total: 6670 wh/m2Hours06:002 w/m2
07:00138 w/m2
08:00353 w/m2
09:00608 w/m2
10:00800 w/m2
11:00911 w/m2
12:00943 w/m2
13:00902 w/m2
14:00790 w/m2
15:00630 w/m2
16:00416 w/m2
17:00176 w/m2
18:001 w/m2
To carry out the solar radiation forecast, the angle of incidence of solar radiation is taken into account, which depends, among others, on the declination, latitude, inclination and hour angle. The weather forecast is also taken into account, since, for example, on a cloudy day we would only have diffuse radiation, much less than direct radiation.
