September 18 is statistically one of the best days of the year in Johannesburg. With minimal rain risk (8%) and pleasant highs of 25°C, it's ideal for outdoor adventures. As it's peak season for Johannesburg, we recommend booking your stay well in advance to secure the best rates.
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Essential Travel Info for Johannesburg
Currency
ZAR
R South African rand
Language
Afrikaans
+10 more
Driving
Left side
Connect
Always-On[dead link], +27 11 575-2505, p...
Safety
Moderate Safety
GPI: 2.283
Johannesburg Weather Forecast for September 18
"Mild & Comfortable. Expect average highs of 24.5°C. 8% chance of rain."
What to Wear in Johannesburg in September
Based on historical data for September 18, Johannesburg typically experiences temperatures between 10.1°C and 24.5°C. We recommend packing light jacket, long pants, layers (onion system) to stay comfortable. Trends suggest it will stay mostly dry (8% rain probability), but checking the forecast before heading out is always wise.
Complete Packing Guide
Weekly breakdown & essential items for Johannesburg
Smart Suitcase
- Light Jacket
- Long Pants
- Layers (Onion System)
Average High
24.5°C
Daytime Peak
Average Low
10.1°C
Nighttime Low
Feels Like
24.5°C
☀️ Feels accurate
Rain Chance
8%
Avg 0.2mm if it rains
Cloud Cover
25%
Clear sky
Pressure
1018.2 hPa
Low volatility
Johannesburg Weather Conditions & UV Index
Weather Confidence
30-year variance analysis
Based on 10 years of data
~ Weather is generally predictable, but pack for minor variations. A light backup layer is recommended.
Sun Exposure
UV Index & Safety Guide
Protection Needed
SPF 30 recommended
06:00 - 10:00
16:00 - 18:00
Type I-II
🔴 15 min to burn
Type III-IV
🟡 23 min to burn
Type V-VI
🟢 38 min to burn
UV estimate based on latitude, season & cloud cover. Actual UV may vary.
Outdoor Comfort
How pleasant is it outside?
Dew Point
10°C
Pleasant
Heat Stress
Low
No heat warning
😊 Best outdoor time:
Any time during daylight hours
Travel & Logistics Insights
Local Calendar
Business Day
Standard hours in South Africa
Flight Traffic
High
94/100 pressure index
Health Advisory
Required
2 vaccines • View Details →
Landing Slots
~283
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in Johannesburg
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
06:03
☀️ Noon
12:03
🌇 Sunset
18:03
⏱️ Daylight
11h 59m
Wind Speed
19.2 km/h
Gentle breeze
Sunshine
10.6 hrs
Direct Sun (Cloud-free)
Humidity
40%
Comfortable
Travel Intelligence
Exclusive flight analytics & health data for Johannesburg
Smart Flight Estimator
Airport-to-Airport Logistics
unlock smart flight estimates
Add your home location in settings to see airport details.
Travel Health & Safety in Johannesburg
Travel Comfort Index
Real-time tourism conditions
Weather Quality
☀️ Excellent
Tourist Crowds
🟡 Busy
Price Level
💰💰💰 Expensive
Health & Wellbeing
Meteo-Health Forecast
Stable conditions. Low risk of headaches.
Weather unlikely to affect joint pain.
Moderate fish activity expected.
Air quality is acceptable. Sensitive individuals should limit prolonged outdoor exertion.
Regional Safety Profile
Seismic Activity
Moderate seismic activity. Occasional tremors possible.
"According to 30YearWeather's analysis of 30 years of NASA satellite data, Johannesburg on September 18 averages 24.5°C with a 8% precipitation probability. Wedding/Outdoor Event Score: 100/100."
— Source: 30YearWeather.com|Data: NASA POWER (1991-2021)|View Methodology
Johannesburg Weather History (2010–2024)
Temperature History
Hall of Fame
Records from last 10 years
Compare Other Cities
Same date (September 18) in other destinations
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📍 Is Johannesburg Worth Visiting on September 18?
Planning a trip to Johannesburg on September 18? Our historical weather analysis based on 30 years of NASA satellite data shows that this time of year is characterized by pleasant mild weather averaging 24.5°C with a 8% historical precipitation risk.
✈️ Travel Logistics: Approximately 283 landing slots available daily during this period, indicating manageable crowd levels.
💉 Health Advisory: 9 vaccinations are recommended for South Africa, including COVID-19.
📊 Historical Extremes: The hottest September 18 recorded in the last 30 years saw temperatures hit 30.4°C in 2018, while the coldest dropped to 5.4°C in 2016.