ERA5 almanac comparison — 8 years of real data
San Diego vs Scottsdale: weather in August
San Diego edges out Scottsdale for sun in August: 90% clear historically versus 75% (8-year ERA5 average, a 15-point gap). Both are viable — San Diego is the safer bet.
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.
San Diego
CA
- Clear days, August
- 90%
- Sample size
- n=248 days
- Avg high
- 78°F
- Early August (1st–15th)
- 92%
- Late August (16th–end)
- 88%
- Rain frequency
- 2% of days
Scottsdale
AZ
- Clear days, August
- 75%
- Sample size
- n=248 days
- Avg high
- 105°F
- Early August (1st–15th)
- 78%
- Late August (16th–end)
- 73%
- Rain frequency
- 14% of days
Compare San Diego vs Scottsdale 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.