ERA5 almanac comparison — 8 years of real data
Savannah vs St. John, USVI: weather in October
Savannah is the clear winner for sun in October: 47% of days historically clear versus just 15% in St. John, USVI — a 32-point gap across 8 years of ERA5 data. St. John, USVI also sees measurably more rain than Savannah this month (59% vs 24% of days). This isn't close.
What you are reading: 8-year historical averages, not a forecast.
Either destination can still surprise you this specific October. For this
week’s actual forecast, each destination links to its live page below.
Savannah
GA
- Clear days, October
- 47%
- Sample size
- n=248 days
- Avg high
- 78°F
- Early October (1st–15th)
- 48%
- Late October (16th–end)
- 47%
- Rain frequency
- 24% of days
St. John, USVI
VI
- Clear days, October
- 15%
- Sample size
- n=248 days
- Avg high
- 80°F
- Early October (1st–15th)
- 18%
- Late October (16th–end)
- 13%
- Rain frequency
- 59% of days
Compare Savannah vs St. John, USVI 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 7-day outlook for any destination is on its own page and may differ from the long-run average. Data from Open-Meteo.