Country Overview For South Africa
The climate in South Africa is typically mostly semiarid; subtropical along east coast; sunny days, cool nights. The terrain: vast interior plateau rimmed by rugged hills and narrow coastal plain. For Pretoria in January the daily average maximum temperatures is 29°C with the average minimum 15°C, while in June the average maximum is 20°C with a minimum of 1°C. The wettest month for Pretoria is December with an average of 112.1mm of precipitation falling while the driest month is July with 1.5mm falling.
HISTORICAL MONTHLY AVERAGES FOR SEPTEMBER
The information presented below gives detailed historical monthly average weather conditions along with exceptional weather occurrences. To maintain relevance to current weather trends the displayed information has been calculated using data collected over the past two decades. The climate profile is taken from closest available data source to Wembley Raceway.
Throughout the month of September daytime temperatures will generally reach highs of around 24°C that's about 76°F. At night the average minimum temperature drops down to around 9°C, that's 48°F.
In recent times the highest recorded temperature in September has been 33°C that's 92°F, with the lowest recorded temperature -3°C, about 26°F.
The average daily relative humidity for September is around 43%.
The Heat Index is a measure of how hot it feels when relative humidity is added to actual air temperature. From this a comfort level is calculated providing categories on how heat conditions might adversely affect someone.
Comfort Levels: Given average maximum temperatures and humidity levels generally you should not anticipate any discomfort from heat (see heat index for more information).
The average monthly amount of precipitation has been recorded at around 20 mm, that's 1 inches. Throughout the month you can expect to see rain or drizzle falling on 4 days of the month.
Estimated Hours of Sunshine per Day
We calculate sunshine hours per day using our past forecast data. For September expect the sun to shine for an average of 11 hours per day. This represents the average number of hours in the daytime that the sun is visible and not obscured by cloud e.g. the average number of hours the sun is actually out and shining. Note we calculate hours of sunshine per day using our past forecast data, not observation data, thus it is an estimate and not actual.
The average daily wind speed in September has been around 16 km/h, that’s the equivalent to about 10 mph, or 8 knots. In recent years the maximum sustained wind speed has reached 74 km/h, that’s the equivalent of around 46 mph, or 40 knots.
On average the month of September is affected by foggy conditions on 3 days.
YEARLY TRENDS: WEATHER AVERAGES & EXTREMES
The following charts show yearly weather trends with information on monthly weather averages and extremes.
The chart below plots the average high and low temperature for each month of the year. It also shows the maximum and minimum recorded temperatures.
The chart below plots the average monthly precipitation amount.
The chart below plots the average number of days in any month that you can expect to see rain falling.
The chart below plots the average daily wind speed you can expect for any month. It also shows the maximum recorded sustained wind speed for each month.