ERA5 almanac comparison — 8 years of real data
Miami vs San Antonio: weather in May
San Antonio edges out Miami for sun in May: 26% clear historically versus 20% (8-year ERA5 average, a 6-point gap). Both are viable — San Antonio is the safer bet.
Miami
FL
- Clear days, May
- 20%
- Sample size
- n=248 days
- Avg high
- 85°F
- Early May (1st–15th)
- 23%
- Late May (16th–end)
- 18%
- Rain frequency
- 57% of days
San Antonio
TX
- Clear days, May
- 26%
- Sample size
- n=248 days
- Avg high
- 88°F
- Early May (1st–15th)
- 31%
- Late May (16th–end)
- 22%
- Rain frequency
- 48% of days
Frequently asked
Is Miami or San Antonio warmer in May?
San Antonio runs warmer by day in May. Miami averages highs of 85°F (highs n=248 days); San Antonio averages highs of 88°F (highs n=248 days) (ERA5 2018–2025). Historical averages, not a forecast.
Does it rain more in Miami or San Antonio in May?
Days with measurable rain: Miami 57%, San Antonio 48% (n=248 and n=248 days). ERA5 2018–2025; historical, not a forecast.
Which is sunnier in May, Miami or San Antonio?
San Antonio edges out Miami for sun in May: 26% clear historically versus 20% (8-year ERA5 average, a 6-point gap). Both are viable — San Antonio is the safer bet.
Compare Miami 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.