South Carolina experiences a humid subtropical climate, with hot, humid summers and mild winters. Seasonal temperature changes are noticeable, particularly between summer heat and cooler winter nights, as well as between coastal and inland regions. Because of humidity, air conditioning use, and shifting temperatures throughout the year, residents often adjust their bedding seasonally to maintain comfort.
From Charleston and Myrtle Beach to Columbia, Greenville, and Spartanburg, households across South Carolina adapt their blankets and duvets to manage warmth, moisture, and cooler evenings during the winter months.
Important Note on Blanket Warmth
Blanket warmth is subjective and depends on your home’s insulation, air conditioning use, humidity levels, and how warm or cool you feel while sleeping. In the U.S., warmth is commonly measured by weight (GSM), thermal rating (TOG), or a scale of 1–7, where 1 is the lightest and 7 is the warmest.
South Carolina Weather Patterns by Month & Blanket Warmth Suggestions
January:
Cool to mild, with colder nights inland and in upstate areas.
Average temperatures range from 1°C (34°F) to 14°C (57°F).
Blanket Warmth: Medium blanket (Warmth 4–5).
February:
Still cool, with gradual warming toward the end of the month.
Temperatures range from 3°C (37°F) to 17°C (63°F).
Blanket Warmth: Medium blanket (Warmth 4).
March:
Spring begins, with mild days and cooler evenings.
Temperatures range from 7°C (45°F) to 21°C (70°F).
Blanket Warmth: Medium light blanket (Warmth 3) – (4).
April:
Comfortable spring weather statewide.
Temps range from 11°C (52°F) to 25°C (77°F).
Blanket Warmth: Light blanket (Warmth 2–3).
May:
Warm and increasingly humid.
Temps range from 16°C (61°F) to 29°C (84°F).
Blanket Warmth: Light blanket (Warmth 2).
June:
Hot and humid summer conditions begin.
Temps range from 21°C (70°F) to 33°C (91°F).
Blanket Warmth: Very light blanket or sheet (Warmth 1–2).
July:
Hottest and most humid month statewide.
Temps range from 23°C (73°F) to 35°C (95°F).
Blanket Warmth: Sheet or ultra light blanket (Warmth 1).
August:
Hot, humid, with frequent afternoon storms.
Temps range from 23°C (73°F) to 34°C (93°F).
Blanket Warmth: Sheet or ultra light blanket (Warmth 1).
September:
Still warm, with humidity gradually easing.
Temps range from 20°C (68°F) to 31°C (88°F).
Blanket Warmth: Very light blanket (Warmth 1–2).
October:
Pleasant autumn conditions with cooler nights.
Temps range from 14°C (57°F) to 26°C (79°F).
Blanket Warmth: Light blanket (Warmth 2–3).
November:
Mild days with cooler evenings.
Temps range from 8°C (46°F) to 21°C (70°F).
Blanket Warmth: Medium light blanket (Warmth 3–4).
December:
Mild winter days with cooler nights, especially inland and upstate.
Temps range from 4°C (39°F) to 16°C (61°F).
Blanket Warmth: Medium blanket (Warmth 4–5).
Key Points About South Carolina’s Climate
- Hot, humid summers with strong air conditioning use
- Mild winters with cooler inland and upstate nights
- High humidity affects sleep comfort year round
- Breathable down bedding suits warm months
- Medium warmth blankets suit winter conditions
- Layered bedding works best during seasonal transitions
Handmade Blankets, Duvets, Pillows & Mattress Toppers by Supreme Quilts
Supreme Quilts is an Australian bedding company that sources ethically collected goose and duck down and feathers from Poland, with veterinary certificates available for every fill type.
Well maintained goose down blankets and pillows can last up to 20 years, making any bedding product from Supreme Quilts a long term investment in your year round comfort in South Carolina.
Handmade Goose and Duck Down Blankets and Duvets – South Carolina, USA
For luxurious Australian made blankets and duvets, choose from six levels of warmth. Blankets are available in King, Queen, Double, and Twin sizes across South Carolina.
Customers throughout South Carolina enjoy the breathable comfort and temperature regulating qualities our down blankets provide through hot humid summers and cooler winter nights.
Choose from 95% Down / 5% Feathers, 90% Down / 10% Feathers, our most luxurious option.
Select between boxed blankets stitched in squares to prevent clumping or channel blankets with rows of down sewn lengthwise depending on your preference.
His & Her duvets are also available, designed with one side warmer than the other, ideal for couples with different comfort needs.
All blankets and duvets include a 12-year structural warranty and free local South Carolina and international shipping on all bedding products.
Handmade Goose and Duck Down Pillows – South Carolina, USA
Our pillows are available in multiple sizes, including Australian Standard, U.S. Standard, and European.
Choose your ideal density Soft, Medium, or Firm, or combination fills such as Soft/Medium or Medium/Firm.
Fill ratios include 50% Down / 50% Feather, 70% Down / 30% Feather, 90% Down / 10% Feather, or 95% Down / 5% Feather, with varied fill amounts and TOG ratings to suit every sleeper.
Each down pillow includes a 5 year structural warranty and free local South Carolina and international shipping.
Handmade Goose and Duck Down Mattress Toppers – South Carolina, USA
Down mattress toppers are available in King, Queen, Double, and Twin bed sizes.
Choose from 95% Down / 5% Feathers or 90% Down / 10% Feathers to achieve your ideal loft and softness.
All toppers include a 5 year structural warranty and free local and international shipping throughout South Carolina so every household can experience the luxury of Supreme Quilts.
