ERA5 almanac comparison — 8 years of real data
Charleston vs Hilton Head: weather in March
Hilton Head edges out Charleston for sun in March: 19% clear historically versus 12% (8-year ERA5 average, a 7-point gap). Both are viable — Hilton Head is the safer bet.
Charleston
SC
- Clear days, March
- 12%
- Sample size
- n=248 days
- Avg high
- 68°F
- Early March (1st–15th)
- 8%
- Late March (16th–end)
- 16%
- Rain frequency
- 29% of days
Hilton Head
SC
- Clear days, March
- 19%
- Sample size
- n=248 days
- Avg high
- 69°F
- Early March (1st–15th)
- 18%
- Late March (16th–end)
- 20%
- Rain frequency
- 30% of days
Frequently asked
Is Charleston or Hilton Head warmer in March?
Hilton Head runs warmer by day in March. Charleston averages highs of 68°F (highs n=248 days); Hilton Head averages highs of 69°F (highs n=248 days) (ERA5 2018–2025). Historical averages, not a forecast.
Does it rain more in Charleston or Hilton Head in March?
Days with measurable rain: Charleston 29%, Hilton Head 30% (n=248 and n=248 days). ERA5 2018–2025; historical, not a forecast.
Which is sunnier in March, Charleston or Hilton Head?
Hilton Head edges out Charleston for sun in March: 19% clear historically versus 12% (8-year ERA5 average, a 7-point gap). Both are viable — Hilton Head is the safer bet.
Compare Charleston vs Hilton Head in another month
All percentages are historical averages from the ERA5 reanalysis via Open-Meteo, 8 full years (2018–2025). “Clear” means avg high ≥ 72 °F, precipitation < 1 mm, and a non-precipitation weather code. This is history, not a forecast. The live forecast for any destination is on its own page and may differ from the long-run average. Data from Open-Meteo.