ERA5 almanac comparison — 8 years of real data
Napa vs Sedona: weather in August
Napa is the clear winner for sun in August: 96% of days historically clear versus just 57% in Sedona — a 39-point gap across 8 years of ERA5 data. Sedona also sees measurably more rain than Napa this month (18% vs 1% of days). This isn't close.
What you are reading: 8-year historical averages, not a forecast.
Either destination can still surprise you this specific August. For this
week’s actual forecast, each destination links to its live page below.
Napa
CA
- Clear days, August
- 96%
- Sample size
- n=248 days
- Avg high
- 88°F
- Early August (1st–15th)
- 97%
- Late August (16th–end)
- 95%
- Rain frequency
- 1% of days
Sedona
AZ
- Clear days, August
- 57%
- Sample size
- n=248 days
- Avg high
- 91°F
- Early August (1st–15th)
- 55%
- Late August (16th–end)
- 59%
- Rain frequency
- 18% of days
Compare Napa vs Sedona 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.