Johannesburg, South Africa skyline

Johannesburg Weather in August

What August is usually like in Johannesburg, South Africa — from 2006–2025 averages.

Expect Johannesburg to reach about 20.1°C (68.2°F) by day and 5.6°C (42.1°F) at night in August, with 1 rainy days bringing 8 mm and around 10.5 hours of sunshine each day.

Avg high

20.1°C (68.2°F)

Avg low

5.6°C (42.1°F)

Rainfall

8 mm (0.3 in)

Rainy days

1 days

Sunshine

10.5 h / day

Humidity

41%

August vs the rest of the year

August is warmer than 3 of the other 11 months, and the 2nd driest month in Johannesburg.

MonthAvg highvs AugustRainRainy days
January24.9°C (76.8°F)+4.8°C (+8.6°F)128 mm15
February24.8°C (76.6°F)+4.7°C (+8.5°F)104 mm13
March23.5°C (74.3°F)+3.4°C (+6.1°F)76 mm12
April20.7°C (69.3°F)+0.6°C (+1.1°F)53 mm8
May19.1°C (66.4°F)−1°C (−1.8°F)15 mm3
June16.6°C (61.9°F)−3.5°C (−6.3°F)8 mm1
July16.8°C (62.2°F)−3.3°C (−5.9°F)3 mm1
August20.1°C (68.2°F)—8 mm1
September24.4°C (75.9°F)+4.3°C (+7.7°F)16 mm3
October25.3°C (77.5°F)+5.2°C (+9.4°F)60 mm10
November24.9°C (76.8°F)+4.8°C (+8.6°F)89 mm13
December25°C (77°F)+4.9°C (+8.8°F)129 mm17

What August feels like in Johannesburg

August is late winter in Johannesburg (Johannesburg is in the southern hemisphere, so the seasons run opposite to Europe and North America), although winter here means mild days rather than cold ones. Afternoons are mild and comfortable for most people in light layers. The day–night swing is wide (about 14.5°C (26.1°F)): nights are cold, so mornings and evenings feel very different from midday. Moderate humidity keeps the air pleasant.

Rain in Johannesburg in August

Rain is rare in August — most weeks pass without a wet day. Each rainy day adds about 7.5 mm (0.3 in), a proper wetting rather than a sprinkle. The yearly figure is similar, around 7.1 mm per wet day. It is among the three driest months of the year.

Daylight and sunshine in August

On 15 August the sun rises at about 6:38 am and sets around 5:48 pm local time, giving 11 h 10 min of daylight. Days are getting longer: 32 min more daylight than in mid-July. Measured sunshine covers about 94% of the daylight — skies are mostly clear.

How August compares to the rest of the year

In Johannesburg's temperature order, August sits as the 4th coolest month. Afternoons run 3.3°C (5.9°F) warmer than in July, with 5 mm more rain. September continues the upward trend. September averages a high of 24.4°C (75.9°F).

Who August suits

  • Sightseeing: a good fit — comfortable enough to explore on foot all day.
  • Parks & outdoor: a good fit — comfortable for long walks and picnics.

Tips for visiting Johannesburg in August

Versatile Layers

Pack pieces you can take off by noon and put back on at dusk.

Sunglasses

Bright days make sunglasses worth packing.

Quick questions

How warm is Johannesburg in August?

It feels mild: typical highs are 20.1°C (68.2°F), with lows near 5.6°C (42.1°F).

Does it rain a lot in Johannesburg in August?

Hardly — only about 1 rainy days and 8 mm for the whole month.

What should I wear in Johannesburg in August?

Pack versatile layers and sunglasses. Bring something extra for the cooler evenings.

Is August or September better for visiting Johannesburg?

August scores better on our climate ranking (#1 of 12 vs #2), rated Great against Great. September is warmer and has more rainy days.

Is August a good time to visit Johannesburg?

Great

Great — comfortable temperatures, mostly dry (about 1 rainy days), plenty of sunshine (10.5 h a day). Within Johannesburg's own year, August ranks #1 of 12 — one of the 3 best months to visit.

August in other South Africa cities

Warmer places in August

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Monthly averages from 20 years of Open-Meteo history (2006–2025), not a forecast — see all 12 months in Johannesburg weather by month.