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SunnyDays

ERA5 almanac comparison — 8 years of real data

30A / Seaside vs St. Augustine: weather in September

30A / Seaside edges out St. Augustine for sun in September: 32% clear historically versus 17% (8-year ERA5 average, a 15-point gap). St. Augustine also sees measurably more rain than 30A / Seaside this month (64% vs 48% of days). Both are viable — 30A / Seaside is the safer bet.

What you are reading: 8-year historical averages, not a forecast. Either destination can still surprise you this specific September. For the actual forecast right now, each destination links to its live page below.

30A / Seaside

FL

Clear days, September
32%
Sample size
n=240 days
Avg high
85°F
Early September (1st–15th)
27%
Late September (16th–end)
37%
Rain frequency
48% of days
See the live forecast →

St. Augustine

FL

Clear days, September
17%
Sample size
n=240 days
Avg high
83°F
Early September (1st–15th)
11%
Late September (16th–end)
23%
Rain frequency
64% of days
See the live forecast →

Frequently asked

Is 30A / Seaside or St. Augustine warmer in September?

30A / Seaside runs warmer by day in September. 30A / Seaside averages highs of 85°F (highs n=240 days); St. Augustine averages highs of 83°F (highs n=240 days) (ERA5 2018–2025). Historical averages, not a forecast.

Does it rain more in 30A / Seaside or St. Augustine in September?

St. Augustine is measurably wetter than 30A / Seaside. Days with measurable rain: 30A / Seaside 48%, St. Augustine 64% (n=240 and n=240 days). ERA5 2018–2025; historical, not a forecast.

Which is sunnier in September, 30A / Seaside or St. Augustine?

30A / Seaside edges out St. Augustine for sun in September: 32% clear historically versus 17% (8-year ERA5 average, a 15-point gap). St. Augustine also sees measurably more rain than 30A / Seaside this month (64% vs 48% of days). Both are viable — 30A / Seaside is the safer bet.

Compare 30A / Seaside vs St. Augustine 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.