ERA5 almanac comparison — 8 years of real data
Key West vs Tucson: weather in August
Tucson is the clear winner for sun in August: 55% of days historically clear versus just 13% in Key West — a 42-point gap across 8 years of ERA5 data. Key West also sees measurably more rain than Tucson this month (62% vs 24% of days). This isn't close.
Key West
FL
- Clear days, August
- 13%
- Sample size
- n=248 days
- Avg high
- 86°F
- Early August (1st–15th)
- 15%
- Late August (16th–end)
- 11%
- Rain frequency
- 62% of days
Tucson
AZ
- Clear days, August
- 55%
- Sample size
- n=248 days
- Avg high
- 99°F
- Early August (1st–15th)
- 50%
- Late August (16th–end)
- 59%
- Rain frequency
- 24% of days
Frequently asked
Is Key West or Tucson warmer in August?
Tucson runs warmer by day in August. Key West averages highs of 86°F (highs n=248 days); Tucson averages highs of 99°F (highs n=248 days) (ERA5 2018–2025). Historical averages, not a forecast.
Does it rain more in Key West or Tucson in August?
Key West is measurably wetter than Tucson. Days with measurable rain: Key West 62%, Tucson 24% (n=248 and n=248 days). ERA5 2018–2025; historical, not a forecast.
Which is sunnier in August, Key West or Tucson?
Tucson is the clear winner for sun in August: 55% of days historically clear versus just 13% in Key West — a 42-point gap across 8 years of ERA5 data. Key West also sees measurably more rain than Tucson this month (62% vs 24% of days). This isn't close.
Compare Key West vs Tucson 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 forecast for any destination is on its own page and may differ from the long-run average. Data from Open-Meteo.