December 15 is generally a great time to visit Sydney. While there is a slight chance of rain (18%), showers are usually brief. Expect comfortable 25°C weather. Sydney is currently in its most popular travel window, meaning vibrant crowds and premium pricing.
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Essential Travel Info for Sydney
Currency
AUD
$ Australian dollar
Language
English
Driving
Left side
Connect
See the Sydney district guides for local...
Safety
High Safety
GPI: 1.565
Sydney Weather Forecast for December 15
"Mild & Comfortable. Expect average highs of 24.9°C. 18% chance of rain."
What to Wear in Sydney in December
Based on historical data for December 15, Sydney typically experiences temperatures between 17.8°C and 24.9°C. We recommend packing t-shirt, light clothing to stay comfortable. Trends suggest it will stay mostly dry (18% rain probability), but checking the forecast before heading out is always wise.
Complete Packing Guide
Weekly breakdown & essential items for Sydney
Smart Suitcase
- T-Shirt
- Light Clothing
Average High
24.9°C
Daytime Peak
Average Low
17.8°C
Nighttime Low
Feels Like
25.6°C
☀️ Feels accurate
Rain Chance
18%
Avg 1.2mm if it rains
Cloud Cover
55%
Light drizzle
Pressure
1012.7 hPa
Medium volatility
Sydney Weather Conditions & UV Index
Weather Confidence
30-year variance analysis
Based on 10 years of data
✓ This date historically delivers consistent weather 78% of the time. Safe to plan outdoor activities with confidence.
Sun Exposure
UV Index & Safety Guide
Protection Needed
SPF 30+ required, seek shade
05:00 - 10:00
16:00 - 20:00
Type I-II
🔴 13 min to burn
Type III-IV
🟡 20 min to burn
Type V-VI
🟢 33 min to burn
UV estimate based on latitude, season & cloud cover. Actual UV may vary.
Outdoor Comfort
How pleasant is it outside?
Dew Point
19.5°C
Noticeable
Heat Stress
Low
No heat warning
🙂 Best outdoor time:
Any time during daylight hours
Marine Conditions
Marine Life
No special warnings. Enjoy the swim!
Swim Index
⚠️ Mixed Conditions
Travel & Logistics Insights
Local Calendar
Business Day
Standard hours in Australia
Flight Traffic
High
100/100 pressure index
Health Advisory
Required
1 vaccine • View Details →
Landing Slots
~955
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in Sydney
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
05:39
☀️ Noon
12:51
🌇 Sunset
20:02
⏱️ Daylight
14h 23m
Wind Speed
21.4 km/h
Moderate wind
Sunshine
11.4 hrs
Direct Sun (Cloud-free)
Humidity
72%
Humid / Damp
Travel Intelligence
Exclusive flight analytics & health data for Sydney
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 Sydney
Travel Comfort Index
Real-time tourism conditions
Weather Quality
☀️ Excellent
Tourist Crowds
🟡 Busy
Price Level
💰💰💰 Expensive
Health & Wellbeing
Meteo-Health Forecast
Moderate fluctuations. Some sensitivity possible.
Mild discomfort possible for arthritic conditions.
Moderate fish activity expected.
Air quality is excellent. Perfect for outdoor activities.
Regional Safety Profile
Seismic Activity
Zero seismic activity detected in 30 years.
"According to 30YearWeather's analysis of 30 years of NASA satellite data, Sydney on December 15 averages 24.9°C with a 18% precipitation probability. Wedding/Outdoor Event Score: 98/100."
— Source: 30YearWeather.com|Data: NASA POWER (1991-2021)|View Methodology
Sydney Weather History (2010–2024)
Temperature History
Hall of Fame
Records from last 10 years
Compare Other Cities
Same date (December 15) in other destinations
🌍 Explore the same date in different destinations around the world
📍 Is Sydney Worth Visiting on December 15?
Planning a trip to Sydney on December 15? 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 18% historical precipitation risk.
✈️ Travel Logistics: Approximately 955 landing slots available daily during this period, indicating peak tourist activity.
💉 Health Advisory: 6 vaccinations are recommended for Australia, including COVID-19.
🌊 Coastal Conditions: Water temperature averages 20.9°C (refreshing tonic). Wave conditions are generally surfers only with heights around 1.4m.
📊 Historical Extremes: The hottest December 15 recorded in the last 30 years saw temperatures hit 28.3°C in 2019, while the coldest dropped to 11.9°C in 2022.