December 17 is generally a great time to visit Johannesburg. While there is a slight chance of rain (37%), showers are usually brief. Expect comfortable 25°C weather. 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 December 17
"Mild & Comfortable. Expect average highs of 24.9°C. 37% chance of rain."
What to Wear in Johannesburg in December
Based on historical data for December 17, Johannesburg typically experiences temperatures between 14.2°C and 24.9°C. We recommend packing t-shirt, light clothing, umbrella to stay comfortable. With a 37% chance of rain, keeping a raincoat or umbrella handy is a smart move.
Complete Packing Guide
Weekly breakdown & essential items for Johannesburg
Smart Suitcase
- T-Shirt
- Light Clothing
- Umbrella
Average High
24.9°C
Daytime Peak
Average Low
14.2°C
Nighttime Low
Feels Like
25.6°C
☀️ Feels accurate
Rain Chance
37%
Avg 2.8mm if it rains
Cloud Cover
53%
Light drizzle
Pressure
1014.8 hPa
Low volatility
Johannesburg Weather Conditions & UV Index
Weather Confidence
30-year variance analysis
Based on 10 years of data
🎯 This date historically delivers consistent weather 90% of the time. Safe to plan outdoor activities with confidence.
Sun Exposure
UV Index & Safety Guide
Protection Needed
SPF 50+, limit exposure 10am-4pm
05:00 - 10:00
16:00 - 18:00
Type I-II
🔴 10 min to burn
Type III-IV
🟡 15 min to burn
Type V-VI
🟢 25 min to burn
UV estimate based on latitude, season & cloud cover. Actual UV may vary.
Outdoor Comfort
How pleasant is it outside?
Dew Point
18.6°C
Noticeable
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
99/100 pressure index
Health Advisory
Required
2 vaccines • View Details →
Landing Slots
~296
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in Johannesburg
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
05:11
☀️ Noon
12:05
🌇 Sunset
18:58
⏱️ Daylight
13h 46m
Wind Speed
17.6 km/h
Gentle breeze
Sunshine
11.1 hrs
Direct Sun (Cloud-free)
Humidity
68%
Slightly humid
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
⛅ Good
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 December 17 averages 24.9°C with a 37% precipitation probability. Wedding/Outdoor Event Score: 90/100."
— 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
Better Alternatives Nearby
Consider these dates within ±7 days
December 21
25.1°C • 32% rain
Score
93
December 22
25.2°C • 32% rain
Score
93
December 13
24.4°C • 34% rain
Score
92
💡 Moving your event by a few days could significantly improve weather conditions
Compare Other Cities
Same date (December 17) in other destinations
🌍 Explore the same date in different destinations around the world
📍 Is Johannesburg Worth Visiting on December 17?
Planning a trip to Johannesburg on December 17? 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 24.9°C with a 37% historical precipitation risk.
✈️ Travel Logistics: Approximately 296 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 December 17 recorded in the last 30 years saw temperatures hit 29.7°C in 2018, while the coldest dropped to 11.1°C in 2021.