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Welkom, South Africa climate
BSh Hot semi-arid
Welkom has a mildly seasonal warm-temperate climate (Hot semi-arid, Köppen BSh). The hottest month is January with an average daily high near 32°C, while the coldest is July averaging around 2°C at night. Precipitation totals about 357 mm a year and is strongly seasonal — December alone averages 76 mm while July barely receives 2 mm.
Temperature & precipitation
Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figuresHours of sunshine per day
Estimated sunny hours each month — daylight length × clear-sky fraction · 1991–2020 monthly cloud cover (NASA POWER)Welkom climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 32 | 32 | 30 | 27 | 24 | 21 | 20 | 24 | 28 | 30 | 31 | 32 |
| Avg temp (°C) | 25 | 24 | 22 | 19 | 15 | 12 | 11 | 14 | 18 | 21 | 23 | 24 |
| Avg low (°C) | 17 | 17 | 15 | 11 | 6 | 3 | 2 | 5 | 9 | 13 | 14 | 16 |
| Precipitation (mm) | 66 | 43 | 45 | 19 | 9 | 7 | 2 | 5 | 6 | 26 | 51 | 76 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 32 | 32 | 30 | 27 | 24 | 21 |
| Avg temp (°C) | 25 | 24 | 22 | 19 | 15 | 12 |
| Avg low (°C) | 17 | 17 | 15 | 11 | 6 | 3 |
| Precipitation (mm) | 66 | 43 | 45 | 19 | 9 | 7 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 20 | 24 | 28 | 30 | 31 | 32 |
| Avg temp (°C) | 11 | 14 | 18 | 21 | 23 | 24 |
| Avg low (°C) | 2 | 5 | 9 | 13 | 14 | 16 |
| Precipitation (mm) | 2 | 5 | 6 | 26 | 51 | 76 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 57 | 54 | 48 | 41 | 28 | 22 | 20 | 26 | 33 | 47 | 52 | 59 |
| Relative humidity (%) | 53 | 56 | 57 | 57 | 52 | 53 | 50 | 43 | 36 | 43 | 47 | 50 |
| Wind speed (mph) | 5.3 | 4.8 | 4.5 | 4.5 | 4.4 | 4.7 | 4.9 | 5.8 | 6.3 | 6.4 | 6.5 | 5.9 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 57 | 54 | 48 | 41 | 28 | 22 |
| Relative humidity (%) | 53 | 56 | 57 | 57 | 52 | 53 |
| Wind speed (mph) | 5.3 | 4.8 | 4.5 | 4.5 | 4.4 | 4.7 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 20 | 26 | 33 | 47 | 52 | 59 |
| Relative humidity (%) | 50 | 43 | 36 | 43 | 47 | 50 |
| Wind speed (mph) | 4.9 | 5.8 | 6.3 | 6.4 | 6.5 | 5.9 |
Methodology & sources
Temperature & precipitation — 1991–2020 normals computed from 21 years of daily observations at Welkom, a weather station, about 7 km from the city centre. The underlying daily records come from NOAA's global station network.
Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.