September 15 is generally a great time to visit St. Lucia. While there is a slight chance of rain (36%), showers are usually brief. Expect comfortable 29°C weather. St. Lucia is seeing high visitor numbers, so iconic spots may be busier than usual.
View the full calendar
Essential Travel Info for St. Lucia
Currency
XCD
$ Eastern Caribbean dollar
Language
English
Driving
Left side
St. Lucia Weather Forecast for September 15
"Warm & Sunny. Expect average highs of 29.1°C. 36% chance of rain."
What to Wear in St. Lucia in September
Based on historical data for September 15, St. Lucia typically experiences temperatures between 23.9°C and 29.1°C. We recommend packing t-shirt, light clothing, umbrella to stay comfortable. With a 36% chance of rain, keeping a raincoat or umbrella handy is a smart move.
Complete Packing Guide
Weekly breakdown & essential items for St. Lucia
Smart Suitcase
- T-Shirt
- Light Clothing
- Umbrella
Average High
29.1°C
Daytime Peak
Average Low
23.9°C
Nighttime Low
Feels Like
34.6°C
🔥 Heat index effect
Rain Chance
36%
Avg 2.2mm if it rains
Cloud Cover
65%
Light drizzle
Pressure
1012.9 hPa
Low volatility
St. Lucia Weather Conditions & UV Index
Weather Confidence
30-year variance analysis
Based on 10 years of data
🎯 This date historically delivers consistent weather 97% of the time. Safe to plan outdoor activities with confidence.
Sun Exposure
UV Index & Safety Guide
Protection Needed
SPF 30 recommended
05:00 - 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
24.9°C
Humid/Sticky
Heat Index
34.6°C
Feels hotter
😐 Best outdoor time:
Morning hours (before 11 AM)
Travel & Logistics Insights
Local Calendar
Business Day
Standard hours in Saint Lucia
Flight Traffic
Busy
70/100 pressure index
Health Advisory
Required
2 vaccines • View Details →
Landing Slots
~7
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in St. Lucia
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
05:54
☀️ Noon
12:00
🌇 Sunset
18:07
⏱️ Daylight
12h 12m
Wind Speed
18.2 km/h
Gentle breeze
Sunshine
10.7 hrs
Direct Sun (Cloud-free)
Humidity
78%
Humid / Damp
Travel Intelligence
Exclusive flight analytics & health data for St. Lucia
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. Lucia
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.
Mild discomfort possible for arthritic conditions.
Moderate fish activity expected.
Air quality is excellent. Perfect for outdoor activities.
Regional Safety Profile
Seismic Activity
Moderate seismic activity. Occasional tremors possible.
Atlantic Hurricane Risk
Season: Jun - Nov
"According to 30YearWeather's analysis of 30 years of NASA satellite data, St. Lucia on September 15 averages 29.1°C with a 36% precipitation probability. Wedding/Outdoor Event Score: 86/100."
— Source: 30YearWeather.com|Data: NASA POWER (1991-2021)|View Methodology
St. Lucia Weather History (2010–2024)
Temperature History
Hall of Fame
Records from last 10 years
Better Alternatives Nearby
Consider these dates within ±7 days
September 8
29.1°C • 27% rain
Score
91
September 9
29.1°C • 28% rain
Score
91
September 10
29.1°C • 33% rain
Score
88
💡 Moving your event by a few days could significantly improve weather conditions
Compare Other Cities
Same date (September 15) in other destinations
🌍 Explore the same date in different destinations around the world
📍 Is St. Lucia Worth Visiting on September 15?
Planning a trip to St. Lucia on September 15? Our historical weather analysis based on 30 years of NASA satellite data shows that this time of year typically offers vibrant summer conditions averaging 29.1°C with a 36% historical precipitation risk.
✈️ Travel Logistics: Approximately 7 landing slots available daily during this period, indicating manageable crowd levels.
💉 Health Advisory: 8 vaccinations are recommended for Saint Lucia, including COVID-19.
📊 Historical Extremes: The hottest September 15 recorded in the last 30 years saw temperatures hit 31.3°C in 2021, while the coldest dropped to 22.4°C in 2025.