Johannesburg Climate & Weather Averages
South Africa · Subtropical Highlands climate · Data averaged from 2020-01-01 to 2024-12-31 (5 years)
Best Time to Visit Johannesburg
Based on temperature comfort, low rainfall, and sunshine hours, the best months to visit Johannesburg are:
September, August, July
Scores based on ideal temperature (18-28°C), low precipitation, and high sunshine. September scores 70/100.
Johannesburg has a Subtropical Highlands climate with mild summers and mild winters. The warmest month is December with an average temperature of 19.5°C (67.1°F), while June is the coldest at 9.8°C (49.6°F). Annual precipitation averages 642.0mm spread across approximately 141.0 rainy days per year, with December being the wettest month at 126.6mm and July the driest at 0.8mm. The city receives an average of 9.8-11.3 hours of sunshine per day, with the sunniest months being January and September. Humidity remains relatively consistent throughout the year, averaging around 56.7% annually, while average wind speeds reach 18.2 km/h. The overall annual mean temperature is 16.0°C (60.8°F), reflecting the subtropical highlands conditions shaped by Johannesburg's latitude (-26.2°) and surrounding geography. For travelers, the best time to visit is September, August, July, when temperatures are comfortable and rainfall is lower.
Johannesburg's altitude of 1,753 meters creates a subtropical highland climate with comfortable temperatures and summer rainfall. I've studied the data and found that the city experiences mild, dry winters and warm, wet summers. The best time for visiting is May to September, when the weather is dry and the city's outdoor attractions are most accessible.
Seasonal Climate Overview
Spring (Mar-May)
Average temperature 15.5°C (59.9°F), rainfall 43.9mm, sunshine 10.2 hrs/day, humidity 61.7%. Mild transitional weather characterizes this period. Expect around 11.0 rainy days per month.
Summer (Jun-Aug)
Average temperature 10.8°C (51.4°F), rainfall 5.5mm, sunshine 10.2 hrs/day, humidity 45.9%. Mild transitional weather characterizes this period. Expect around 2.3 rainy days per month.
Autumn (Sep-Nov)
Average temperature 18.2°C (64.8°F), rainfall 48.1mm, sunshine 11.0 hrs/day, humidity 50.2%. Mild transitional weather characterizes this period. Expect around 12.1 rainy days per month.
Winter (Dec-Feb)
Average temperature 19.4°C (66.9°F), rainfall 116.4mm, sunshine 11.1 hrs/day, humidity 69.0%. Mild transitional weather characterizes this period. Expect around 21.7 rainy days per month.
Monthly Temperature Averages (°C / °F)
| Month | Avg High | Avg Low | Mean Temp |
|---|---|---|---|
| January | 25.2°C (77.4°F) | 14.4°C (57.9°F) | 19.4°C (66.9°F) |
| February | 25.0°C (77.0°F) | 14.3°C (57.7°F) | 19.3°C (66.7°F) |
| March | 24.1°C (75.4°F) | 13.0°C (55.4°F) | 18.2°C (64.8°F) |
| April | 21.4°C (70.5°F) | 10.1°C (50.2°F) | 15.3°C (59.5°F) |
| May | 19.7°C (67.5°F) | 7.3°C (45.1°F) | 13.0°C (55.4°F) |
| June | 16.6°C (61.9°F) | 4.0°C (39.2°F) | 9.8°C (49.6°F) |
| July | 17.2°C (63.0°F) | 3.5°C (38.3°F) | 9.8°C (49.6°F) |
| August | 20.4°C (68.7°F) | 6.2°C (43.2°F) | 12.9°C (55.2°F) |
| September | 24.7°C (76.5°F) | 10.0°C (50.0°F) | 17.1°C (62.8°F) |
| October | 25.7°C (78.3°F) | 12.0°C (53.6°F) | 18.4°C (65.1°F) |
| November | 25.5°C (77.9°F) | 13.6°C (56.5°F) | 19.1°C (66.4°F) |
| December | 25.2°C (77.4°F) | 14.7°C (58.5°F) | 19.5°C (67.1°F) |
Monthly Precipitation (mm)
| Month | Avg Rainfall | Bar |
|---|---|---|
| January | 113.6 mm | |
| February | 109.1 mm | |
| March | 41.9 mm | |
| April | 72.7 mm | |
| May | 17.1 mm | |
| June | 12.8 mm | |
| July | 0.8 mm | |
| August | 3.0 mm | |
| September | 12.6 mm | |
| October | 44.7 mm | |
| November | 87.1 mm | |
| December | 126.6 mm |
Monthly Rainy Days (avg days with rain > 0.1mm)
| Month | Avg Rainy Days | Bar |
|---|---|---|
| January | 21.6 | |
| February | 19.2 | |
| March | 17.0 | |
| April | 11.0 | |
| May | 5.0 | |
| June | 3.0 | |
| July | 1.6 | |
| August | 2.4 | |
| September | 5.2 | |
| October | 10.8 | |
| November | 20.2 | |
| December | 24.4 |
Monthly Humidity (%)
| Month | Avg Humidity | Bar |
|---|---|---|
| January | 69.0% | |
| February | 69.7% | |
| March | 66.1% | |
| April | 63.7% | |
| May | 55.4% | |
| June | 52.3% | |
| July | 44.1% | |
| August | 41.3% | |
| September | 40.2% | |
| October | 49.5% | |
| November | 61.0% | |
| December | 68.3% |
Monthly Wind Speed (avg max km/h)
| Month | Avg Max Wind | Bar |
|---|---|---|
| January | 17.3 km/h | |
| February | 16.5 km/h | |
| March | 16.1 km/h | |
| April | 16.7 km/h | |
| May | 15.5 km/h | |
| June | 17.2 km/h | |
| July | 17.9 km/h | |
| August | 20.2 km/h | |
| September | 21.3 km/h | |
| October | 20.8 km/h | |
| November | 20.7 km/h | |
| December | 18.5 km/h |
Monthly UV Index (avg max)
| Month | UV Index | Risk Level | Bar |
|---|---|---|---|
| January | — | — | |
| February | — | — | |
| March | — | — | |
| April | — | — | |
| May | — | — | |
| June | — | — | |
| July | — | — | |
| August | — | — | |
| September | — | — | |
| October | — | — | |
| November | — | — | |
| December | — | — |
Monthly Snowfall (cm)
| Month | Avg Snowfall | Bar |
|---|---|---|
| January | 0.0 cm | |
| February | 0.0 cm | |
| March | 0.0 cm | |
| April | 0.0 cm | |
| May | 0.0 cm | |
| June | 0.1 cm | |
| July | 0.0 cm | |
| August | 0.0 cm | |
| September | 0.0 cm | |
| October | 0.0 cm | |
| November | 0.0 cm | |
| December | 0.0 cm |
Monthly Sunshine Hours (daily average)
| Month | Avg Daily Sunshine | Bar |
|---|---|---|
| January | 11.3 hrs | |
| February | 10.8 hrs | |
| March | 10.6 hrs | |
| April | 10.1 hrs | |
| May | 10.0 hrs | |
| June | 9.8 hrs | |
| July | 10.2 hrs | |
| August | 10.6 hrs | |
| September | 11.2 hrs | |
| October | 10.8 hrs | |
| November | 11.1 hrs | |
| December | 11.1 hrs |
Frequently Asked Questions
What is the hottest month in Johannesburg?
December is the hottest month with an average temperature of 19.5°C (67.1°F).
What is the coldest month in Johannesburg?
June is the coldest month with an average temperature of 9.8°C (49.6°F).
What is the rainiest month in Johannesburg?
December is the wettest month with an average of 126.6mm of precipitation. The city experiences about 141.0 rainy days per year.
When is the best time to visit Johannesburg?
The best time to visit Johannesburg is during September, August, July, when temperatures are comfortable and rainfall is lower.
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Data Source: Open-Meteo historical archive (2020-01-01 to 2024-12-31). Daily measurements aggregated into monthly climate normals. Coordinates: -26.2°, 28.05°. Timezone: Africa/Johannesburg. Last updated: 2026-07-30.