December 18 is generally a great time to visit St. John's. While there is a slight chance of rain (19%), showers are usually brief. Expect comfortable 27°C weather. It's a lively time to explore St. John's, with most attractions operating at full capacity.
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Essential Travel Info for St. John's
Currency
XCD
$ Eastern Caribbean dollar
Language
English
Driving
Left side
St. John's Weather Forecast for December 18
"Warm & Sunny. Expect average highs of 27.3°C. 19% chance of rain."
What to Wear in St. John's in December
Based on historical data for December 18, St. John's typically experiences temperatures between 24.6°C and 27.3°C. We recommend packing t-shirt, light clothing to stay comfortable. Trends suggest it will stay mostly dry (19% rain probability), but checking the forecast before heading out is always wise.
Complete Packing Guide
Weekly breakdown & essential items for St. John's
Smart Suitcase
- T-Shirt
- Light Clothing
Average High
27.3°C
Daytime Peak
Average Low
24.6°C
Nighttime Low
Feels Like
29.8°C
🔥 Feels warmer
Rain Chance
19%
Avg 1.3mm if it rains
Cloud Cover
36%
Light drizzle
Pressure
1015.1 hPa
Low volatility
St. John's Weather Conditions & UV Index
Weather Confidence
30-year variance analysis
Based on 10 years of data
🎯 This date historically delivers consistent weather 83% of the time. Safe to plan outdoor activities with confidence.
Sun Exposure
UV Index & Safety Guide
Protection Needed
SPF 15 for extended outdoor time
UV estimate based on latitude, season & cloud cover. Actual UV may vary.
Outdoor Comfort
How pleasant is it outside?
Dew Point
22.2°C
Humid/Sticky
Heat Index
29.8°C
Feels hotter
😐 Best outdoor time:
Morning hours (before 11 AM)
Marine Conditions
Marine Life
No special warnings. Enjoy the swim!
Swim Index
⚠️ Mixed Conditions
Travel & Logistics Insights
Local Calendar
Business Day
Standard hours in Antigua and Barbuda
Flight Traffic
Busy
74/100 pressure index
Health Advisory
Required
2 vaccines • View Details →
Landing Slots
~17
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in St. John's
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
06:32
☀️ Noon
12:05
🌇 Sunset
17:38
⏱️ Daylight
11h 6m
Wind Speed
29.4 km/h
Fresh breeze
Sunshine
10.0 hrs
Direct Sun (Cloud-free)
Humidity
74%
Humid / Damp
Travel Intelligence
Exclusive flight analytics & health data for St. John's
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 St. John's
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 excellent. Perfect for outdoor activities.
Regional Safety Profile
Seismic Activity
Active seismic zone. Multiple earthquakes per year.
Atlantic Hurricane Risk
Season: Jun - Nov
Travel Alert: This region has elevated natural risks. We recommend registering with your embassy and keeping emergency numbers handy.
"According to 30YearWeather's analysis of 30 years of NASA satellite data, St. John's on December 18 averages 27.3°C with a 19% precipitation probability. Wedding/Outdoor Event Score: 89/100."
— Source: 30YearWeather.com|Data: NASA POWER (1991-2021)|View Methodology
St. John's Weather History (2010–2024)
Temperature History
Hall of Fame
Records from last 10 years
Better Alternatives Nearby
Consider these dates within ±7 days
December 23
27.4°C • 15% rain
Score
96
December 25
27.4°C • 12% rain
Score
95
December 21
27.3°C • 17% rain
Score
92
💡 Moving your event by a few days could significantly improve weather conditions
Compare Other Cities
Same date (December 18) in other destinations
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📍 Is St. John's Worth Visiting on December 18?
Planning a trip to St. John's 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 27.3°C with a 19% historical precipitation risk.
✈️ Travel Logistics: Approximately 17 landing slots available daily during this period, indicating manageable crowd levels.
💉 Health Advisory: 7 vaccinations are recommended for Antigua and Barbuda, including COVID-19.
🌊 Coastal Conditions: Water temperature averages 27.6°C (tropical bath). Wave conditions are generally surfers only with heights around 1.37m.
📊 Historical Extremes: The hottest December 18 recorded in the last 30 years saw temperatures hit 29.5°C in 2024, while the coldest dropped to 24°C in 2018.