ERA5 almanac comparison — 8 years of real data
Savannah vs St. John, USVI: weather in August
St. John, USVI edges out Savannah for sun in August: 13% clear historically versus 8% (8-year ERA5 average, a 5-point gap). Savannah also sees measurably more rain than St. John, USVI this month (73% vs 51% of days). Both are viable — St. John, USVI is the safer bet.
Savannah
GA
- Clear days, August
- 8%
- Sample size
- n=248 days
- Avg high
- 87°F
- Early August (1st–15th)
- 3%
- Late August (16th–end)
- 12%
- Rain frequency
- 73% of days
St. John, USVI
VI
- Clear days, August
- 13%
- Sample size
- n=248 days
- Avg high
- 80°F
- Early August (1st–15th)
- 10%
- Late August (16th–end)
- 16%
- Rain frequency
- 51% of days
Frequently asked
Is Savannah or St. John, USVI warmer in August?
Savannah runs warmer by day in August. Savannah averages highs of 87°F (highs n=248 days); St. John, USVI averages highs of 80°F (highs n=248 days) (ERA5 2018–2025). Historical averages, not a forecast.
Does it rain more in Savannah or St. John, USVI in August?
Savannah is measurably wetter than St. John, USVI. Days with measurable rain: Savannah 73%, St. John, USVI 51% (n=248 and n=248 days). ERA5 2018–2025; historical, not a forecast.
Which is sunnier in August, Savannah or St. John, USVI?
St. John, USVI edges out Savannah for sun in August: 13% clear historically versus 8% (8-year ERA5 average, a 5-point gap). Savannah also sees measurably more rain than St. John, USVI this month (73% vs 51% of days). Both are viable — St. John, USVI is the safer bet.
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 forecast for any destination is on its own page and may differ from the long-run average. Data from Open-Meteo.