Hottest (avg)
#9 / 12
Sits around the middle of the year.
August in context
How it compares to the rest of the year in Johannesburg South.
Wettest (avg)
#10 / 12
One of the drier months.
Daylight Hours
#9 / 12
Around the yearly average.
Windiest (avg)
#4 / 12
Close to the yearly wind average.
Highest UV
#9 / 12
Near the middle of the yearly UV range.
Most Humid
#11 / 12
One of the less humid months.
Monthly climate breakdown
A detailed look at the typical climate conditions for August.
Thermal profile
Temperature
Typical daytime high
- Nighttime low
-
- Feels like (avg)
-
Light window
Sunshine
11.2 h
Average daylight
- UV index (max)
- 7
- Typical sun hours
- 06:35 - 17:48
Wet-day pattern
Rain & Snow
Typical rainfall
- Rainy days
- 3 days
- Cloud cover (avg)
- 16%
- Snowfall
-
Air feel
Humidity & Wind
44%
Average humidity
- Wind (avg)
-
- Wind (max gusts)
-
Historical daily baseline
Daily climate explorer
Pick a day to inspect the usual conditions through August in Johannesburg South. Based on a 30-year historical climate baseline, not a forecast.
Primary control
Select a day
Scroll to compare daily conditions. The summary updates with your selection.
Secondary context
Monthly trend
Median daytime highs across the month, with a softer low line.
Median temperatureMedian lowTypical range
Day 15 selected for August. Temperature 20.1°C.
Historical disruption baseline
Typical disruptions in August
Based on 30 years of historical data, these are the disruption patterns most likely to affect plans in August.
Cold High impact
Cold feels-like nights Measures: Cold feels-like nights (min <=5C). Observed about 82% of days (25.5 days/month) in August. Historical risk signal only, not a day-by-day forecast.
Likely frequency
25.5 days / month
- Share of days
- ~82% of days
- Upper edge
- Up to ~5°C (P95)
Why this matters
Cold feels-like nights are possible on ~25 days. Long outdoor blocks become harder to sustain, so layer up and keep a warm indoor fallback nearby.
Wind High impact
Strong gusts Measures: Strong gust days (>=60 km/h). Observed about 5% of days (1.5 days/month) in August. Historical risk signal only, not a day-by-day forecast.
Likely frequency
1.5 days / month
- Share of days
- ~5% of days
- Upper edge
- Up to ~79km/h (P95)
Why this matters
Strong gusts are possible on ~1 days. Exposed activities and transport links are more likely to be disrupted, so keep sheltered alternatives ready.
Cold Moderate
Freezing nights Measures: Freezing nights (min <=0C). Observed about 5% of days (1.5 days/month) in August. Historical risk signal only, not a day-by-day forecast.
Likely frequency
1.5 days / month
- Share of days
- ~5% of days
- Upper edge
- Up to ~-0°C (P95)
Why this matters
Freezing nights are possible on ~1 days. Fixed-time outdoor plans are safer with a backup option and flexible timing.
Show all disruptions (15 more)
Rain High impact
Washout risk Measures: Washout day risk. Observed about 1% of days (0.4 days/month) in August. Historical risk signal only, not a day-by-day forecast.
Likely frequency
0.4 days / month
- Share of days
- ~1% of days
- Upper edge
- Up to ~18mm (P95)
Why this matters
Washout conditions are possible on ~0 days. Outdoor plans can become unreliable, so keep an indoor backup and flexibility around start times.
Rain Moderate
Rain disruption Measures: Likely rain disruption days. Observed about 2% of days (0.5 days/month) in August. Historical risk signal only, not a day-by-day forecast.
Likely frequency
0.5 days / month
- Share of days
- ~2% of days
- Upper edge
- Up to ~18mm (P95)
Why this matters
Rain disruption risk appears on ~0 days. Outdoor plans can become unreliable, so keep an indoor backup and flexibility around start times.
Rain Moderate
Heavy rain days Measures: Heavy rain days (>=10mm). Observed about 1% of days (0.2 days/month) in August. Historical risk signal only, not a day-by-day forecast.
Likely frequency
0.2 days / month
- Share of days
- ~1% of days
- Upper edge
- Up to ~20mm (P95)
Why this matters
Heavy rain is possible on ~0 days. Outdoor plans can become unreliable, so keep an indoor backup and flexibility around start times.
Cold Minor
Cold nights Measures: Cold nights (min <=5C). Observed about 45% of days (13.9 days/month) in August. Historical risk signal only, not a day-by-day forecast.
Likely frequency
13.9 days / month
- Share of days
- ~45% of days
- Upper edge
- Up to ~5°C (P95)
Why this matters
Cold nights are possible on ~14 days. Long outdoor blocks become harder to sustain, so layer up and keep a warm indoor fallback nearby.
Wind Minor
Gusty days Measures: Gusty days (>=40 km/h). Observed about 43% of days (13.4 days/month) in August. Historical risk signal only, not a day-by-day forecast.
Likely frequency
13.4 days / month
- Share of days
- ~43% of days
- Upper edge
- Up to ~68km/h (P95)
Why this matters
Gusty conditions are possible on ~13 days. Exposed activities and transport links are more likely to be disrupted, so keep sheltered alternatives ready.
Rain Minor
Wet days Measures: Wet days (>=0.1mm). Observed about 12% of days (3.7 days/month) in August. Historical risk signal only, not a day-by-day forecast.
Likely frequency
3.7 days / month
- Share of days
- ~12% of days
- Upper edge
- Up to ~10mm (P95)
Why this matters
Measurable rain is possible on ~4 days. Fixed-time outdoor plans are safer with a backup option and flexible timing.
Cloud Minor
Cloudy days Measures: Cloudy days (cloud cover >=60%). Observed about 7% of days (2.3 days/month) in August. Historical risk signal only, not a day-by-day forecast.
Likely frequency
2.3 days / month
- Share of days
- ~7% of days
- Upper edge
- Up to ~95% (P95)
Why this matters
Cloudy skies are possible on ~2 days. Fixed-time outdoor plans are safer with a backup option and flexible timing.
Rain Minor
Rainy hours Measures: Rain-hours signal (>=3h rain). Observed about 7% of days (2.2 days/month) in August. Historical risk signal only, not a day-by-day forecast.
Likely frequency
2.2 days / month
- Share of days
- ~7% of days
- Upper edge
- Up to ~16h (P95)
Why this matters
Several rainy hours are possible on ~2 days. Outdoor plans can become unreliable, so keep an indoor backup and flexibility around start times.
Rain Minor
Wet most of day Measures: Wet-most-of-day signal (>=6h rain). Observed about 3% of days (1.1 days/month) in August. Historical risk signal only, not a day-by-day forecast.
Likely frequency
1.1 days / month
- Share of days
- ~3% of days
- Upper edge
- Up to ~19h (P95)
Why this matters
Wet-most-of-day conditions are possible on ~1 days. Outdoor plans can become unreliable, so keep an indoor backup and flexibility around start times.
Cloud Minor
Mostly cloudy days Measures: Mostly cloudy days (cloud cover >=80%). Observed about 2% of days (0.8 days/month) in August. Historical risk signal only, not a day-by-day forecast.
Likely frequency
0.8 days / month
- Share of days
- ~2% of days
- Upper edge
- Up to ~96% (P95)
Why this matters
Mostly cloudy skies are possible on ~1 days. Fixed-time outdoor plans are safer with a backup option and flexible timing.
Humidity Minor
High humidity Measures: High humidity days (RH >=80%). Observed about 1% of days (0.5 days/month) in August. Historical risk signal only, not a day-by-day forecast.
Likely frequency
0.5 days / month
- Share of days
- ~1% of days
- Upper edge
- Up to ~90% (P95)
Why this matters
High humidity is possible on ~0 days. Comfort and pace can drop quickly, so plan shorter outdoor blocks with air-conditioned backup stops.
Cold Minor
Cold days Measures: Cold days (max <=10C). Observed about 1% of days (0.3 days/month) in August. Historical risk signal only, not a day-by-day forecast.
Likely frequency
0.3 days / month
- Share of days
- ~1% of days
- Upper edge
- Up to ~10°C (P95)
Why this matters
Cold daytime conditions are possible on ~0 days. Long outdoor blocks become harder to sustain, so layer up and keep a warm indoor fallback nearby.
Wind Minor
Breezy days Measures: Breezy days (mean wind >=25 km/h). Observed about 1% of days (0.2 days/month) in August. Historical risk signal only, not a day-by-day forecast.
Likely frequency
0.2 days / month
- Share of days
- ~1% of days
- Upper edge
- Up to ~29km/h (P95)
Why this matters
Breezy conditions are possible on ~0 days. Exposed activities and transport links are more likely to be disrupted, so keep sheltered alternatives ready.
Cold Minor
Hard freeze nights Measures: Hard freeze nights (min <=-2C). Observed about 1% of days (0.2 days/month) in August. Historical risk signal only, not a day-by-day forecast.
Likely frequency
0.2 days / month
- Share of days
- ~1% of days
- Upper edge
- Up to ~-2°C (P95)
Why this matters
Hard freeze conditions are possible on ~0 days. Long outdoor blocks become harder to sustain, so layer up and keep a warm indoor fallback nearby.
Cloud Minor
Overcast days Measures: Overcast days (cloud cover >=95%). Observed about 1% of days (0.2 days/month) in August. Historical risk signal only, not a day-by-day forecast.
Likely frequency
0.2 days / month
- Share of days
- ~1% of days
- Upper edge
- Up to ~98% (P95)
Why this matters
Overcast skies are possible on ~0 days. Fixed-time outdoor plans are safer with a backup option and flexible timing.
Travel planning FAQ
Frequently asked questions
Quick answers to the weather questions you ask the most.
Is August a good time to visit Johannesburg South?
Typical August days in Johannesburg South reach highs of 20°C (68°F) with nights around 5°C (41°F). It usually feels mild by day and cold after dark. It is one of the drier months, which suits outdoor exploring and sightseeing.
What are temperatures like in August?
Daytime temperatures in August typically peak near 20°C (68°F), while nights drop to around 5°C (41°F). Expect mild afternoons and cold evenings.
How much does it rain in August?
Rainfall in August averages 9 mm (0.35 in) across roughly 3 days. Overall it is a mostly dry time of year, so showers are usually brief rather than all-day downpours.
How many hours of daylight are there in August?
You can expect about 11 hours of daylight in August. Sunrise is typically around 06:35 and sunset near 17:48. Daylight is fairly typical, with enough time for sightseeing.
How strong is the sun in August?
UV levels are often high (around 7). Regular sunscreen and a hat are recommended.
Is it windy in August?
In August, average wind speeds are around 12 km/h (7 mph), with gusts on the windiest days reaching about 55 km/h (34 mph). On the ground, it is it can feel quite windy at times, particularly when weather systems move through.