Health effects can be felt by sensitive groups, including children, older adults, and people with respiratory or heart conditions. The general public is less likely to be affected.

Health & Activity Advice

⚠ Take Precautions

UV index is 8 today — high. Apply sunscreen before heading out, and consider a hat or shade during peak hours (roughly late morning to mid-afternoon).

Health effects can be felt by sensitive groups, including children, older adults, and people with respiratory or heart conditions. The general public is less likely to be affected.

Morning before 10 AM or evening after 4 PM is the more comfortable window for outdoor activity today.

Nearby Regional Outlook

Johannesburg Weather Radar

Live precipitation · Cloud cover · Wind

View live radar →

Frequently Asked Questions

What is the hottest month in Johannesburg?

The hottest month in Johannesburg is typically January, with daytime highs averaging around 25.7°C (78°F), based on 10 years of historical weather data. Overnight lows during this period average near 14.7°C (58°F).

What is the coldest month in Johannesburg?

The coldest month in Johannesburg is typically July, with overnight lows averaging around 3.8°C (39°F) and daytime highs near 17.2°C (63°F), based on 10 years of historical weather data.

Does Johannesburg have a rainy season?

Johannesburg doesn't have a sharply defined rainy season rainfall is fairly spread across the year based on 10 years of historical data. January is the wettest month on average (about 120 mm), while July is the driest (about 4 mm).

What's the best time of year to visit Johannesburg?

The best time to visit Johannesburg is typically August to September, when daytime highs average a comfortable 22.8°C (73°F). Rainfall during this window averages around 8 mm, one of the lighter, more comfortable stretches of the year. This is based on 10 years of historical weather data.

Is Johannesburg's air quality safe right now?

As of the latest reading, Johannesburg's air quality index (AQI) is 36, rated "Good", based on the nearest monitoring station. Air quality is considered satisfactory, with little to no health risk.

Atmospheric Details

Wind

3 km/h

SSW · Light Breeze · Max 8 km/h

Humidity

35 %

Comfortable

UV Index

Very High

Visibility

16 km

Excellent

Pressure

834 hPa

Low · change likely

Dew Point

5°C

Dry air

Today vs Normal

22°C-4° below normal

The long-term average high for today is 26°C.

12 of the last 19 days with published data ran above normal.

That's a break from the pattern - today's forecast runs below normal even though the recent stretch mostly ran above.

Red = above normal, blue = at or below · last 12 days

Air Quality

Unhealthy for Sensitive Groups

Health effects can be felt by sensitive groups, including children, older adults, and people with respiratory or heart conditions. The general public is less likely to be affected.

Health & Activity Advice

⚠ Take Precautions

UV index is 8 today — high. Apply sunscreen before heading out, and consider a hat or shade during peak hours (roughly late morning to mid-afternoon).

Health effects can be felt by sensitive groups, including children, older adults, and people with respiratory or heart conditions. The general public is less likely to be affected.

Morning before 10 AM or evening after 4 PM is the more comfortable window for outdoor activity today.