September 18 sees frequent showers in Charlotte Amalie. Historical data shows a 40% chance of rain, so pack accordingly. Temperatures average 28°C. It's a quieter period for Charlotte Amalie, ideal for those who prefer unhurried sightseeing.
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Essential Travel Info for Charlotte Amalie
Charlotte Amalie Weather Forecast for September 18
"Warm & Sunny. Expect average highs of 28.4°C. 40% chance of rain."
What to Wear in Charlotte Amalie in September
Based on historical data for September 18, Charlotte Amalie typically experiences temperatures between 26.6°C and 28.4°C. We recommend packing t-shirt, light clothing, umbrella to stay comfortable. With a 40% chance of rain, keeping a raincoat or umbrella handy is a smart move.
Complete Packing Guide
Weekly breakdown & essential items for Charlotte Amalie
Smart Suitcase
- T-Shirt
- Light Clothing
- Umbrella
Average High
28.4°C
Daytime Peak
Average Low
26.6°C
Nighttime Low
Feels Like
33.1°C
🔥 Feels warmer
Rain Chance
40%
Avg 3mm if it rains
Cloud Cover
61%
Light drizzle
Pressure
1013.1 hPa
Low volatility
Charlotte Amalie Weather Conditions & UV Index
Weather Confidence
30-year variance analysis
Based on 10 years of data
🎯 This date historically delivers consistent weather 80% of the time. Safe to plan outdoor activities with confidence.
Sun Exposure
UV Index & Safety Guide
Protection Needed
SPF 30 recommended
06:00 - 10:00
16:00 - 18:00
Type I-II
🔴 24 min to burn
Type III-IV
🟡 36 min to burn
Type V-VI
🟢 60 min to burn
UV estimate based on latitude, season & cloud cover. Actual UV may vary.
Outdoor Comfort
How pleasant is it outside?
Dew Point
24.6°C
Humid/Sticky
Heat Index
33.1°C
Feels hotter
😕 Best outdoor time:
Morning hours (before 11 AM)
Marine Conditions
Jellyfish Warning
High water temps may attract jellyfish swarms.
Swim Index
⚠️ Mixed Conditions
Travel & Logistics Insights
Local Calendar
Business Day
Standard hours in US Virgin Islands
Flight Traffic
Quiet
31/100 pressure index
Health Advisory
Healthy
Routine only • View Details →
Landing Slots
~16
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in Charlotte Amalie
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
06:09
☀️ Noon
12:15
🌇 Sunset
18:21
⏱️ Daylight
12h 11m
Wind Speed
26.2 km/h
Moderate wind
Sunshine
10.2 hrs
Direct Sun (Cloud-free)
Humidity
80%
Humid / Damp
Travel Intelligence
Exclusive flight analytics & health data for Charlotte Amalie
Smart Flight Estimator
Airport-to-Airport Logistics
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Travel Health & Safety in Charlotte Amalie
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 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, Charlotte Amalie on September 18 averages 28.4°C with a 40% precipitation probability. Wedding/Outdoor Event Score: 81/100."
— Source: 30YearWeather.com|Data: NASA POWER (1991-2021)|View Methodology
Charlotte Amalie Weather History (2010–2024)
Temperature History
Hall of Fame
Records from last 10 years
Better Alternatives Nearby
Consider these dates within ±7 days
September 11
28.5°C • 31% rain
Score
84
September 22
28.5°C • 36% rain
Score
84
September 24
28.6°C • 34% rain
Score
84
💡 Moving your event by a few days could significantly improve weather conditions
Compare Other Cities
Same date (September 18) in other destinations
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📍 Is Charlotte Amalie Worth Visiting on September 18?
Planning a trip to Charlotte Amalie on September 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 28.4°C with a 40% historical precipitation risk.
✈️ Travel Logistics: Approximately 16 landing slots available daily during this period, indicating manageable crowd levels.
🌊 Coastal Conditions: Water temperature averages 30.1°C (hot soup). Wave conditions are generally surfers only with heights around 1.27m.
📊 Historical Extremes: The hottest September 18 recorded in the last 30 years saw temperatures hit 29.6°C in 2023, while the coldest dropped to 25.2°C in 2025.