ERA5 almanac comparison — 8 years of real data
Austin vs San Diego: weather in April
Austin edges out San Diego for sun in April: 35% clear historically versus 13% (8-year ERA5 average, a 22-point gap). Austin also sees measurably more rain than San Diego this month (42% vs 11% of days). Both are viable — Austin is the safer bet.
What you are reading: 8-year historical averages, not a forecast.
Either destination can still surprise you this specific April. For this
week’s actual forecast, each destination links to its live page below.
Austin
TX
- Clear days, April
- 35%
- Sample size
- n=240 days
- Avg high
- 80°F
- Early April (1st–15th)
- 39%
- Late April (16th–end)
- 31%
- Rain frequency
- 42% of days
San Diego
CA
- Clear days, April
- 13%
- Sample size
- n=240 days
- Avg high
- 67°F
- Early April (1st–15th)
- 14%
- Late April (16th–end)
- 12%
- Rain frequency
- 11% of days
Compare Austin vs San Diego 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.