Across the year, daylight in Charleston ranges from about 9h 50m in December to 14h 10m in June — a 4h 19m swing that shapes sleep, mood and training rhythms. From roughly late December to January, the sun sits too low for much vitamin D production.
The nearest other Live10X city guide is Savannah, about 83 miles away.
Charleston by the numbers
- County
- Charleston County
- Climate
- Humid subtropical
- Elevation
- near sea level
- Latitude
- 32.8°N
- Shortest day
- 9h 50m
- Longest day
- 14h 10m
- Vitamin D winter
- Late December to January
At a glance
Charleston at a glance
- Top local priority in Charleston: heat-smart summer training.
- Daylight swings from about 9h 50m to 14h 10m across the year — anchor your wake time and get morning light.
- Sunlight is too weak for much vitamin D production from roughly late December to January; a blood test shows where you stand.
- Use Waterfront Park and the Battery and the Ravenel Bridge walkway for easy, regular outdoor movement.
Climate & lifestyle
What living in Charleston means for your health
Charleston has a humid subtropical climate — long, hot and humid summers, mild to cool winters and rain spread through the year, with summer thunderstorms. Summer heat is the main training and sleep challenge; spring and fall are prime outdoor seasons.
- heat-smart summer training
- hydration with electrolytes
- strength and balance training for healthy aging
- protecting sleep on hot nights
Light, sleep & vitamin D
Daylight in Charleston across the year
9h 50m
Shortest day (December)
14h 10m
Longest day (June)
~1 mo
Low-UVB “vitamin D winter”
At about 32.8°N, Charleston sees a 4h 19m swing in day length between the solstices. UVB is weakest in midwinter, but midday sun can still support vitamin D production most of the year. That's roughly late December to January. Bright morning light helps anchor your body clock, and a simple blood test shows whether your vitamin D is where it should be.
Calculated from latitude using standard solar formulas and published latitude research. How we calculate this
Local wellness trends
Wellness trends in Charleston
Heat-season strategy
Long summers in Charleston push workouts to early mornings, shaded trails and indoor gyms — and make hydration a year-round habit.
Food culture & personalized nutrition
Charleston's food scene puts farmers markets and diverse cuisines within reach, fueling interest in gut health and nutrigenomics.
Wellness travel
Visitors and locals alike seek out spas, recovery studios and wellness experiences in and around Charleston.
Beach & waterfront workouts
Sunrise walks, beach runs and open-water swims along the Atlantic give Charleston a natural outdoor gym.
Local health optimization resources
Places to move, recover and eat well in Charleston
- WaterfrontWaterfront Park and the BatteryWaterfront paths for easy cardio and outdoor time.
- Trailthe Ravenel Bridge walkwayCar-free miles for zone 2 walks, runs and rides.
- BeachFolly BeachWalking, swimming and low-impact movement — bring sun protection.
Testing
At-home wellness genetic testing
Available throughout Charleston: order online, collect a sample at home and review results with a qualified professional.
Learn more about at-home wellness genetic testingHealthcare
Preventive care & baseline labs
Primary care clinicians in Charleston County can order baseline labs — such as a lipid panel, HbA1c, vitamin D and B12 — useful context for any wellness plan.
Learn more about preventive care & baseline labsNutrition
Farmers markets & local food
Charleston's food scene makes it easier to eat 30+ different plants a week — shop seasonal produce at local farmers markets.
Learn more about farmers markets & local foodSeasonal playbook
A seasonal wellness playbook for Charleston
- Summer: move hard sessions to early morning or indoors, and watch the heat index, not just the temperature.
- Spring and fall: your best months for long walks, runs, rides and outdoor strength work.
- Winter: mild days keep outdoor activity possible — use them to maintain your aerobic base.
- Year-round: day length only varies by about 4h 19m, so a consistent sleep schedule is easy to hold — protect it.
Recommended reading
The most relevant guides for Charleston residents
FAQ
Charleston wellness FAQs
Do I need to visit a clinic in Charleston for a wellness genetic test?
What's the best time of year to exercise outdoors in Charleston?
Can you get enough vitamin D from the sun in Charleston?
How do seasonal daylight changes in Charleston affect sleep?
Where can you walk, run or train outdoors in Charleston?
What matters most for healthy aging in Charleston?
The bottom line
Living well in Charleston means working with its hot, humid summers and mild winters: heat-smart summer training, hydration with electrolytes and strength and balance training for healthy aging. Add the fundamentals — consistent sleep, daily movement, strength training and a whole-food diet — and personalize with the wellness assessment and at-home testing.
