ERA5 almanac comparison — 8 years of real data
Destin vs San Antonio: weather in September
Essentially a tie in September: Destin is 33% clear historically, San Antonio is 36% clear (8-year ERA5 average) — within the noise. Avg high 86°F vs 92°F. Destin also sees measurably more rain than San Antonio this month (48% vs 31% of days). Pick based on flight time or price, not weather — the weather won't decide this one for you.
Destin
FL
- Clear days, September
- 33%
- Sample size
- n=240 days
- Avg high
- 86°F
- Early September (1st–15th)
- 27%
- Late September (16th–end)
- 39%
- Rain frequency
- 48% of days
San Antonio
TX
- Clear days, September
- 36%
- Sample size
- n=240 days
- Avg high
- 92°F
- Early September (1st–15th)
- 30%
- Late September (16th–end)
- 42%
- Rain frequency
- 31% of days
Frequently asked
Is Destin or San Antonio warmer in September?
San Antonio runs warmer by day in September. Destin averages highs of 86°F (highs n=240 days); San Antonio averages highs of 92°F (highs n=240 days) (ERA5 2018–2025). Historical averages, not a forecast.
Does it rain more in Destin or San Antonio in September?
Destin is measurably wetter than San Antonio. Days with measurable rain: Destin 48%, San Antonio 31% (n=240 and n=240 days). ERA5 2018–2025; historical, not a forecast.
Which is sunnier in September, Destin or San Antonio?
Essentially a tie in September: Destin is 33% clear historically, San Antonio is 36% clear (8-year ERA5 average) — within the noise. Avg high 86°F vs 92°F. Destin also sees measurably more rain than San Antonio this month (48% vs 31% of days). Pick based on flight time or price, not weather — the weather won't decide this one for you.
Compare Destin vs San Antonio 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.