September 17 is generally a great time to visit Charleston. While there is a slight chance of rain (29%), showers are usually brief. Expect comfortable 28°C weather. As it's peak season for Charleston, we recommend booking your stay well in advance to secure the best rates.
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Essential Travel Info for Charleston
Currency
USD
$ United States dollar
Language
English
Driving
Right side
Safety
Moderate Safety
GPI: 2.44
Charleston Weather Forecast for September 17
"Warm & Sunny. Expect average highs of 27.7°C. 29% chance of rain."
What to Wear in Charleston in September
Based on historical data for September 17, Charleston typically experiences temperatures between 21.6°C and 27.7°C. We recommend packing t-shirt, light clothing to stay comfortable. With a 29% chance of rain, keeping a raincoat or umbrella handy is a smart move.
Complete Packing Guide
Weekly breakdown & essential items for Charleston
Smart Suitcase
- T-Shirt
- Light Clothing
Average High
27.7°C
Daytime Peak
Average Low
21.6°C
Nighttime Low
Feels Like
31.1°C
🔥 Feels warmer
Rain Chance
29%
Avg 2.4mm if it rains
Cloud Cover
52%
Light drizzle
Pressure
1016 hPa
Low volatility
Charleston Weather Conditions & UV Index
Weather Confidence
30-year variance analysis
Based on 10 years of data
✓ This date historically delivers consistent weather 75% 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
🔴 25 min to burn
Type III-IV
🟡 38 min to burn
Type V-VI
🟢 63 min to burn
UV estimate based on latitude, season & cloud cover. Actual UV may vary.
Outdoor Comfort
How pleasant is it outside?
Dew Point
23.5°C
Humid/Sticky
Heat Index
31.1°C
Feels hotter
😐 Best outdoor time:
Morning hours (before 11 AM)
Marine Conditions
Jellyfish Warning
High water temps may attract jellyfish swarms.
Swim Index
✅ Excellent Swimming Conditions
Travel & Logistics Insights
Local Calendar
Business Day
Standard hours in United States
Flight Traffic
High
88/100 pressure index
Health Advisory
Healthy
Routine only • View Details →
Landing Slots
~121
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in Charleston
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
06:05
☀️ Noon
12:15
🌇 Sunset
18:25
⏱️ Daylight
12h 19m
Wind Speed
17.3 km/h
Gentle breeze
Sunshine
9.6 hrs
Direct Sun (Cloud-free)
Humidity
78%
Humid / Damp
Travel Intelligence
Exclusive flight analytics & health data for Charleston
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 Charleston
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
Rare minor tremors. Buildings are earthquake-resistant.
Atlantic Hurricane Risk
Season: Jun - Nov
"According to 30YearWeather's analysis of 30 years of NASA satellite data, Charleston on September 17 averages 27.7°C with a 29% precipitation probability. Wedding/Outdoor Event Score: 93/100."
— Source: 30YearWeather.com|Data: NASA POWER (1991-2021)|View Methodology
Charleston Weather History (2010–2024)
Temperature History
Hall of Fame
Records from last 10 years
Better Alternatives Nearby
Consider these dates within ±7 days
September 22
27°C • 26% rain
Score
95
September 23
27.1°C • 24% rain
Score
95
September 13
28.1°C • 28% rain
Score
94
💡 Moving your event by a few days could significantly improve weather conditions
Compare Other Cities
Same date (September 17) in other destinations
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📍 Is Charleston Worth Visiting on September 17?
Planning a trip to Charleston on September 17? Our historical weather analysis based on 30 years of NASA satellite data shows that this time of year typically offers vibrant summer conditions averaging 27.7°C with a 29% historical precipitation risk.
✈️ Travel Logistics: Approximately 121 landing slots available daily during this period, indicating manageable crowd levels.
🌊 Coastal Conditions: Water temperature averages 26.3°C (tropical bath). Wave conditions are generally fun waves with heights around 0.78m.
📊 Historical Extremes: The hottest September 17 recorded in the last 30 years saw temperatures hit 31.6°C in 2019, while the coldest dropped to 17.5°C in 2024.