Climate Chart of Johannesburg, South Africa
Monthly data: Temperature °C, Rain (mm), Sunshine (h) · 2013–2023
For Johannesburg, South Africa, the climate data cover 2013–2023. Monthly mean temperatures range from the coolest-month reading of 9.5 °C in July to the highest-month reading of 19.6 °C in January. The pattern also includes a marked contrast in mean daily rainfall, from 0.12 mm/day in July to 4.02 mm/day in December. Sunshine and snowfall records add further context, though these averages do not describe conditions on every individual day.
Climate overview
Temperature
The monthly mean temperature is highest in January, at 19.6 °C, and lowest in July, at 9.5 °C. These are averages for each month, not daytime maximum temperatures, so they cannot show how warm or cool a particular afternoon may feel. The unweighted mean across the calendar-month means is 15.7 °C. It gives a broad summary of the monthly averages rather than a day-weighted annual average.
Rain
Mean daily rainfall reaches its highest monthly value in December, at 4.02 mm/day, and its lowest in July, at 0.12 mm/day. These figures are daily means, not monthly rainfall totals; the lower average does not guarantee rain-free days or indicate how often rain occurs. The unweighted mean of the monthly mean daily rainfall values is 1.79 mm/day. It provides a summary across the calendar-month means, not a day-weighted annual average.
Sunshine
Mean daily sunshine duration is highest in January, at 11.05 hours/day, and lowest in June, at 9.49 hours/day. The monthly figures can help with broad outdoor-planning expectations, but sunshine duration is not the same as day length and does not guarantee the conditions on a particular day. The unweighted mean across the monthly mean sunshine durations is 10.25 hours/day. This summarizes the calendar-month means rather than providing a day-weighted annual average.
Snow
The highest monthly mean daily snowfall is recorded in June, at 0.01 mm/day. This small daily mean does not establish how many days have snowfall, snow depth, snow cover, or whether skiing conditions are present.
Best Travel Time Guide for Johannesburg, South Africa: Ideal Seasons and Weather Insights
For visitors prioritising lower average rainfall, July is the conditional option in the records, with mean daily rainfall of 0.12 mm/day; this average cannot guarantee dry days or describe rain frequency. Rain preparation is especially relevant for December, when the mean daily rainfall is 4.02 mm/day. These figures are daily averages rather than monthly totals, so plan flexibly rather than treating either month as a promise of particular weather. If cooler monthly mean temperatures are a priority, consider July, whose monthly mean is 9.5 °C; this is not a daytime maximum and cannot predict conditions on a specific visit. For daylight outdoor planning, mean daily sunshine duration is highest in January at 11.05 hours/day, and lowest in June at 9.49 hours/day. Sunshine duration is not day length, and neither average identifies a universally best time to visit.
Climate Data Overview for Johannesburg, South Africa
Explore the comprehensive climate data for Johannesburg, South Africa. This detailed table provides valuable insights into temperature variations, precipitation levels, and seasonal changes, helping you understand the unique weather patterns of this region.
| Month | Average: Temperature °C | Rain (mm) / day | Snow (mm) / day | Sunshine (h) / day |
|---|---|---|---|---|
| Jan | 19.6 | 3.68 | 0.00 | 11.05 |
| Feb | 19.1 | 3.89 | 0.00 | 10.44 |
| Mar | 17.7 | 2.37 | 0.00 | 10.10 |
| Apr | 15.0 | 1.81 | 0.00 | 9.56 |
| May | 12.5 | 0.47 | 0.00 | 9.60 |
| Jun | 9.8 | 0.19 | 0.01 | 9.49 |
| Jul | 9.5 | 0.12 | 0.00 | 9.58 |
| Aug | 12.7 | 0.13 | 0.00 | 10.10 |
| Sep | 16.8 | 0.38 | 0.00 | 10.65 |
| Oct | 18.2 | 1.56 | 0.00 | 10.88 |
| Nov | 18.7 | 2.86 | 0.00 | 10.96 |
| Dec | 19.2 | 4.02 | 0.00 | 10.63 |
| Average | 15.7 | 1.79 | 0.00 | 10.25 |
