May 15 is generally a great time to visit Charleston. While there is a slight chance of rain (19%), showers are usually brief. Expect comfortable 26°C weather. Charleston is currently in its most popular travel window, meaning vibrant crowds and premium pricing.
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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 May 15
"Warm & Sunny. Expect average highs of 25.9°C. 19% chance of rain."
What to Wear in Charleston in May
Based on historical data for May 15, Charleston typically experiences temperatures between 18.9°C and 25.9°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 Charleston
Smart Suitcase
- T-Shirt
- Light Clothing
Average High
25.9°C
Daytime Peak
Average Low
18.9°C
Nighttime Low
Feels Like
26.8°C
☀️ Feels accurate
Rain Chance
19%
Avg 1.4mm if it rains
Cloud Cover
51%
Overcast
Pressure
1016.6 hPa
Medium volatility
Charleston Weather Conditions & UV Index
Weather Confidence
30-year variance analysis
Based on 10 years of data
🎯 This date historically delivers consistent weather 100% of the time. Safe to plan outdoor activities with confidence.
Sun Exposure
UV Index & Safety Guide
Protection Needed
SPF 30+ required, seek shade
05:00 - 10:00
16:00 - 19:00
Type I-II
🔴 13 min to burn
Type III-IV
🟡 20 min to burn
Type V-VI
🟢 33 min to burn
UV estimate based on latitude, season & cloud cover. Actual UV may vary.
Outdoor Comfort
How pleasant is it outside?
Dew Point
20.7°C
Humid/Sticky
Heat Stress
Low
No heat warning
🙂 Best outdoor time:
Morning hours (before 11 AM)
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 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
05:22
☀️ Noon
12:17
🌇 Sunset
19:12
⏱️ Daylight
13h 50m
Wind Speed
19.2 km/h
Gentle breeze
Sunshine
11.6 hrs
Direct Sun (Cloud-free)
Humidity
73%
Humid / Damp
Travel Intelligence
Exclusive flight analytics & health data for Charleston
Smart Flight Estimator
Airport-to-Airport Logistics
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Travel Health & Safety in Charleston
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.
Atlantic Hurricane Risk
Season: Jun - Nov
"According to 30YearWeather's analysis of 30 years of NASA satellite data, Charleston on May 15 averages 25.9°C with a 19% precipitation probability. Wedding/Outdoor Event Score: 97/100."
— 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
💡 Moving your event by a few days could significantly improve weather conditions
Compare Other Cities
Same date (May 15) in other destinations
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📍 Is Charleston Worth Visiting on May 15?
Planning a trip to Charleston on May 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 25.9°C with a 19% historical precipitation risk.
✈️ Travel Logistics: Approximately 121 landing slots available daily during this period, indicating manageable crowd levels.
🌊 Coastal Conditions: Water temperature averages 24.6°C (swimming pool). Wave conditions are generally fun waves with heights around 0.75m.
📊 Historical Extremes: The hottest May 15 recorded in the last 30 years saw temperatures hit 29°C in 2017, while the coldest dropped to 13.3°C in 2021.