ERA5 almanac comparison — 8 years of real data
Martha's Vineyard vs Savannah: weather in September
Savannah edges out Martha's Vineyard for sun in September: 32% clear historically versus 27% (8-year ERA5 average, a 5-point gap). Savannah also sees measurably more rain than Martha's Vineyard this month (50% vs 34% of days). Both are viable — Savannah is the safer bet.
Martha's Vineyard
MA
- Clear days, September
- 27%
- Sample size
- n=240 days
- Avg high
- 72°F
- Early September (1st–15th)
- 39%
- Late September (16th–end)
- 15%
- Rain frequency
- 34% of days
Savannah
GA
- Clear days, September
- 32%
- Sample size
- n=240 days
- Avg high
- 85°F
- Early September (1st–15th)
- 28%
- Late September (16th–end)
- 37%
- Rain frequency
- 50% of days
Frequently asked
Is Martha's Vineyard or Savannah warmer in September?
Savannah runs warmer by day in September. Martha's Vineyard averages highs of 72°F (highs n=240 days); Savannah averages highs of 85°F (highs n=240 days) (ERA5 2018–2025). Historical averages, not a forecast.
Does it rain more in Martha's Vineyard or Savannah in September?
Savannah is measurably wetter than Martha's Vineyard. Days with measurable rain: Martha's Vineyard 34%, Savannah 50% (n=240 and n=240 days). ERA5 2018–2025; historical, not a forecast.
Which is sunnier in September, Martha's Vineyard or Savannah?
Savannah edges out Martha's Vineyard for sun in September: 32% clear historically versus 27% (8-year ERA5 average, a 5-point gap). Savannah also sees measurably more rain than Martha's Vineyard this month (50% vs 34% of days). Both are viable — Savannah is the safer bet.
Compare Martha's Vineyard vs Savannah 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.