ERA5 almanac comparison — 8 years of real data
San Diego vs Wine Country Sonoma: weather in April
Wine Country Sonoma edges out San Diego for sun in April: 32% clear historically versus 13% (8-year ERA5 average, a 19-point gap). Both are viable — Wine Country Sonoma 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.
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
Wine Country Sonoma
CA
- Clear days, April
- 32%
- Sample size
- n=240 days
- Avg high
- 68°F
- Early April (1st–15th)
- 21%
- Late April (16th–end)
- 44%
- Rain frequency
- 14% of days
Compare San Diego vs Wine Country Sonoma 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.