ERA5 almanac comparison — 8 years of real data
Hilton Head vs Kennebunkport: weather in September
Hilton Head edges out Kennebunkport for sun in September: 33% clear historically versus 18% (8-year ERA5 average, a 15-point gap). Hilton Head also sees measurably more rain than Kennebunkport this month (50% vs 30% of days). Both are viable — Hilton Head is the safer bet.
Hilton Head
SC
- Clear days, September
- 33%
- Sample size
- n=240 days
- Avg high
- 83°F
- Early September (1st–15th)
- 28%
- Late September (16th–end)
- 38%
- Rain frequency
- 50% of days
Kennebunkport
ME
- Clear days, September
- 18%
- Sample size
- n=240 days
- Avg high
- 70°F
- Early September (1st–15th)
- 24%
- Late September (16th–end)
- 12%
- Rain frequency
- 30% of days
Frequently asked
Is Hilton Head or Kennebunkport warmer in September?
Hilton Head runs warmer by day in September. Hilton Head averages highs of 83°F (highs n=240 days); Kennebunkport averages highs of 70°F (highs n=240 days) (ERA5 2018–2025). Historical averages, not a forecast.
Does it rain more in Hilton Head or Kennebunkport in September?
Hilton Head is measurably wetter than Kennebunkport. Days with measurable rain: Hilton Head 50%, Kennebunkport 30% (n=240 and n=240 days). ERA5 2018–2025; historical, not a forecast.
Which is sunnier in September, Hilton Head or Kennebunkport?
Hilton Head edges out Kennebunkport for sun in September: 33% clear historically versus 18% (8-year ERA5 average, a 15-point gap). Hilton Head also sees measurably more rain than Kennebunkport this month (50% vs 30% of days). Both are viable — Hilton Head is the safer bet.
Compare Hilton Head vs Kennebunkport 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.