December 18 is statistically one of the best days of the year in Adelaide. With minimal rain risk (6%) and pleasant highs of 27°C, it's ideal for outdoor adventures. As it's peak season for Adelaide, we recommend booking your stay well in advance to secure the best rates.
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Essential Travel Info for Adelaide
Currency
AUD
$ Australian dollar
Language
English
Driving
Left side
Connect
There is extensive free Wi-Fi access (po...
Safety
High Safety
GPI: 1.565
Adelaide Weather Forecast for December 18
"Warm & Sunny. Expect average highs of 27°C. 6% chance of rain."
What to Wear in Adelaide in December
Based on historical data for December 18, Adelaide typically experiences temperatures between 16.2°C and 27°C. We recommend packing t-shirt, light clothing to stay comfortable. Trends suggest it will stay mostly dry (6% rain probability), but checking the forecast before heading out is always wise.
Complete Packing Guide
Weekly breakdown & essential items for Adelaide
Smart Suitcase
- T-Shirt
- Light Clothing
Average High
27°C
Daytime Peak
Average Low
16.2°C
Nighttime Low
Feels Like
27.5°C
☀️ Feels accurate
Rain Chance
6%
Avg 0.2mm if it rains
Cloud Cover
43%
Overcast
Pressure
1012.5 hPa
Medium volatility
Adelaide 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+ required, seek shade
06:00 - 10:00
16:00 - 20:00
Type I-II
🔴 12 min to burn
Type III-IV
🟡 18 min to burn
Type V-VI
🟢 30 min to burn
UV estimate based on latitude, season & cloud cover. Actual UV may vary.
Outdoor Comfort
How pleasant is it outside?
Dew Point
16.3°C
Noticeable
Heat Index
27.5°C
Feels hotter
😊 Best outdoor time:
Any time during daylight hours
Marine Conditions
Marine Life
No special warnings. Enjoy the swim!
Swim Index
✅ Excellent Swimming 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
~145
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in Adelaide
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
06:28
☀️ Noon
13:43
🌇 Sunset
20:58
⏱️ Daylight
14h 29m
Wind Speed
23.5 km/h
Moderate wind
Sunshine
12.4 hrs
Direct Sun (Cloud-free)
Humidity
52%
Comfortable
Travel Intelligence
Exclusive flight analytics & health data for Adelaide
Smart Flight Estimator
Airport-to-Airport Logistics
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Add your home location in settings to see airport details.
Travel Health & Safety in Adelaide
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.
Weather unlikely to affect joint pain.
Moderate fish activity expected.
Air quality is excellent. Perfect for outdoor activities.
Regional Safety Profile
Seismic Activity
Rare minor tremors. Buildings are earthquake-resistant.
"According to 30YearWeather's analysis of 30 years of NASA satellite data, Adelaide on December 18 averages 27°C with a 6% precipitation probability. Wedding/Outdoor Event Score: 100/100."
— Source: 30YearWeather.com|Data: NASA POWER (1991-2021)|View Methodology
Adelaide Weather History (2010–2024)
Temperature History
Hall of Fame
Records from last 10 years
Compare Other Cities
Same date (December 18) in other destinations
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📍 Is Adelaide Worth Visiting on December 18?
Planning a trip to Adelaide on December 18? Our historical weather analysis based on 30 years of NASA satellite data shows that this time of year typically offers vibrant summer conditions averaging 27°C with a 6% historical precipitation risk.
✈️ Travel Logistics: Approximately 145 landing slots available daily during this period, indicating manageable crowd levels.
💉 Health Advisory: 6 vaccinations are recommended for Australia, including COVID-19.
🌊 Coastal Conditions: Water temperature averages 21.2°C (swimming pool). Wave conditions are generally fun waves with heights around 0.67m.
📊 Historical Extremes: The hottest December 18 recorded in the last 30 years saw temperatures hit 41°C in 2019, while the coldest dropped to 10.6°C in 2016.