ERA5 almanac comparison — 8 years of real data
San Antonio vs San Luis Obispo: weather in March
San Antonio edges out San Luis Obispo for sun in March: 33% clear historically versus 10% (8-year ERA5 average, a 23-point gap). Both are viable — San Antonio is the safer bet.
What you are reading: 8-year historical averages, not a forecast.
Either destination can still surprise you this specific March. For this
week’s actual forecast, each destination links to its live page below.
San Antonio
TX
- Clear days, March
- 33%
- Sample size
- n=248 days
- Avg high
- 78°F
- Early March (1st–15th)
- 32%
- Late March (16th–end)
- 33%
- Rain frequency
- 32% of days
San Luis Obispo
CA
- Clear days, March
- 10%
- Sample size
- n=248 days
- Avg high
- 63°F
- Early March (1st–15th)
- 2%
- Late March (16th–end)
- 17%
- Rain frequency
- 36% of days
Compare San Antonio vs San Luis Obispo 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.