Johannesburg, Gauteng, South Africa Climate Change Severity

57
High
The current climate change severity in Johannesburg is High, with a 11.2% worsening in the climate score compared to last 16 years. This suggests deteriorating conditions, with increasing negative impacts on weather patterns and environmental conditions.
Data: Jan. to Jul. (Historical Vs 2026) - Weather Data Only
Low
020
Moderate
40
High
60
Very High
80
Extreme
100
°C

Johannesburg Weather Condition Changes (Historic Vs 2026)

2026
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
Historic
2026

Over the past 16 year(s), Johannesburg temperature has changed by around +8.02%, and has experienced notable climate changes.

Sunny
Cloudy
Rainy
Snowy
Misty
Data: Jan. to Jul. (Historical Vs 2026)

Comparison of Weather Condition (Historic Vs 2026)

HistoricDays

Year 2026Days

Change

sunnySunny
10985
-22.01%
cloudyCloudy
168
-50%
rainyRainy
8170
-13.5%
snowySnowy
00
0%
mistyMisty
01
100%

Disclaimer: Other weather conditions not shown may affect the total day count.

Climate Change Indicators:

Over the past 16 years, Johannesburg has experienced measurable shifts in key climate parameters, contributing to the current severity score of 57 (within the High severity category). This suggests worsening climate conditions from the previous years. Here’s a breakdown of the specific changes observed:

Severity Score

57/100

High

Low
020
Moderate
40
High
60
Very High
80
Extreme
100

From 2010 to 2026, Johannesburg experienced significant changes:

Temperature change of

+1.32 °C

Variation in annual rainfall

+4.2 %

Change in average humidity

-3.76 %

PM2.5 levels surged by

-55.03 %

Heatwave changed by

+3 Days

Coldwave changed by

-1 Days

Wind speeds changed by

+1.89 km/h

These indicators show that Johannesburg is experiencing a more volatile and extreme climate, reinforcing the need for urgent intervention to mitigate risks. As the severity score rises, focus must shift to adaptation and emergency preparedness.

Check how we calculate Climate Change Severity
Based on data from Jan. to Jul.

Johannesburg Weather Forecast 30 Days (August - September 2026)
Johannesburg, Gauteng, South Africa

Condition
Temperature IconTemperature
Humidity IconHumi.
Wind IconWind Speed
Sun. 16, Aug.
sunnySunny
Temperature Icon20°/10°
Humidity Icon32%
Wind Icon8.3km/h
Mon. 17, Aug.
sunnySunny
Temperature Icon21°/12°
Humidity Icon28%
Wind Icon9.4km/h
Tue. 18, Aug.
smoky hazeSmoky haze
Temperature Icon23°/14°
Humidity Icon23%
Wind Icon5.8km/h
Wed. 19, Aug.
sunnySunny
Temperature Icon24°/14°
Humidity Icon24%
Wind Icon9.4km/h
Thu. 20, Aug.
sunnySunny
Temperature Icon25°/17°
Humidity Icon20%
Wind Icon5km/h
Fri. 21, Aug.
sunnySunny
Temperature Icon24°/17°
Humidity Icon21%
Wind Icon11.9km/h
Sat. 22, Aug.
sunnySunny
Temperature Icon25°/17°
Humidity Icon21%
Wind Icon11.2km/h
Sun. 23, Aug.
sunnySunny
Temperature Icon21°/15°
Humidity Icon43%
Wind Icon19.8km/h
Mon. 24, Aug.
sunnySunny
Temperature Icon22°/13°
Humidity Icon46%
Wind Icon14.8km/h
Tue. 25, Aug.
patchy rain possibleRain Possible
Temperature Icon24°/9°
Humidity Icon34%
Wind Icon16.7km/h
Wed. 26, Aug.
patchy rain possibleRain Possible
Temperature Icon25°/11°
Humidity Icon32%
Wind Icon16.4km/h
Thu. 27, Aug.
patchy rain possibleRain Possible
Temperature Icon24°/10°
Humidity Icon33%
Wind Icon17.4km/h
Fri. 28, Aug.
patchy rain possibleRain Possible
Temperature Icon24°/10°
Humidity Icon32%
Wind Icon17.9km/h
Sat. 29, Aug.
patchy rain possibleRain Possible
Temperature Icon24°/10°
Humidity Icon33%
Wind Icon17.2km/h
Sun. 30, Aug.
patchy rain possibleRain Possible
Temperature Icon24°/10°
Humidity Icon36%
Wind Icon16.4km/h
Mon. 31, Aug.
patchy rain possibleRain Possible
Temperature Icon23°/10°
Humidity Icon29%
Wind Icon16.3km/h
Tue. 1, Sep.
patchy rain possibleRain Possible
Temperature Icon23°/10°
Humidity Icon29%
Wind Icon17.6km/h
Wed. 2, Sep.
patchy rain possibleRain Possible
Temperature Icon24°/10°
Humidity Icon30%
Wind Icon17.8km/h
Thu. 3, Sep.
patchy rain possibleRain Possible
Temperature Icon25°/10°
Humidity Icon29%
Wind Icon15.3km/h
Fri. 4, Sep.
patchy rain possibleRain Possible
Temperature Icon25°/11°
Humidity Icon27%
Wind Icon16.2km/h
Sat. 5, Sep.
moderate or heavy rain showerRain Showers
Temperature Icon24°/11°
Humidity Icon28%
Wind Icon17.4km/h
Sun. 6, Sep.
moderate or heavy rain showerRain Showers
Temperature Icon25°/12°
Humidity Icon30%
Wind Icon18.3km/h
Mon. 7, Sep.
moderate or heavy rain showerRain Showers
Temperature Icon25°/11°
Humidity Icon34%
Wind Icon16.9km/h
Tue. 8, Sep.
patchy rain possibleRain Possible
Temperature Icon25°/11°
Humidity Icon33%
Wind Icon16.9km/h
Wed. 9, Sep.
patchy rain possibleRain Possible
Temperature Icon26°/12°
Humidity Icon31%
Wind Icon18.9km/h
Thu. 10, Sep.
patchy rain possibleRain Possible
Temperature Icon26°/12°
Humidity Icon33%
Wind Icon18.5km/h
Fri. 11, Sep.
sunnySunny
Temperature Icon26°/12°
Humidity Icon30%
Wind Icon17.4km/h
Sat. 12, Sep.
patchy rain possibleRain Possible
Temperature Icon26°/12°
Humidity Icon33%
Wind Icon19.1km/h
Sun. 13, Sep.
patchy rain possibleRain Possible
Temperature Icon26°/12°
Humidity Icon34%
Wind Icon18.1km/h
Mon. 14, Sep.
patchy rain possibleRain Possible
Temperature Icon27°/12°
Humidity Icon32%
Wind Icon17.5km/h
Tue. 15, Sep.
patchy rain possibleRain Possible
Temperature Icon27°/13°
Humidity Icon29%
Wind Icon20km/h

Highest & Lowest Weather Forecasts

TemperatureTemperature

High will be onMon. 14, Sep.

27°C

Low will be onTue. 25, Aug.

9°C

HumidityHumidity

High will be onMon. 24, Aug.

46%

Low will be onThu. 20, Aug.

20%

Wind SpeedWind Speed

High will be onTue. 15, Sep.

20km/h

Low will be onThu. 20, Aug.

5km/h

PrecipitationPrecipitation

High will be onSun. 6, Sep.

3.2mm

Low will be onTue. 25, Aug.

0.01mm

Ultraviolet IndexUV

High will be onFri. 21, Aug.

8.2

Low will be onTue. 25, Aug.

5

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