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SunnyDays

ERA5 almanac comparison — 8 years of real data

Jacksonville vs St. John, USVI: weather in July

Essentially a tie in July: Jacksonville is 8% clear historically, St. John, USVI is 9% clear (8-year ERA5 average) — within the noise. Avg high 90°F vs 79°F. Jacksonville also sees measurably more rain than St. John, USVI this month (75% vs 46% of days). Pick based on flight time or price, not weather — the weather won't decide this one for you.

What you are reading: 8-year historical averages, not a forecast. Either destination can still surprise you this specific July. For this week’s actual forecast, each destination links to its live page below.

Jacksonville

FL

Clear days, July
8%
Sample size
n=248 days
Avg high
90°F
Early July (1st–15th)
4%
Late July (16th–end)
11%
Rain frequency
75% of days
See this week’s live forecast →

St. John, USVI

VI

Clear days, July
9%
Sample size
n=248 days
Avg high
79°F
Early July (1st–15th)
10%
Late July (16th–end)
9%
Rain frequency
46% of days

Compare Jacksonville 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.