ERA5 almanac comparison — 8 years of real data
Key West vs Miami: weather in May
Key West edges out Miami for sun in May: 33% clear historically versus 20% (8-year ERA5 average, a 13-point gap). Miami also sees measurably more rain than Key West this month (57% vs 38% of days). Both are viable — Key West is the safer bet.
Key West
FL
- Clear days, May
- 33%
- Sample size
- n=248 days
- Avg high
- 82°F
- Early May (1st–15th)
- 38%
- Late May (16th–end)
- 29%
- Rain frequency
- 38% of days
Miami
FL
- Clear days, May
- 20%
- Sample size
- n=248 days
- Avg high
- 85°F
- Early May (1st–15th)
- 23%
- Late May (16th–end)
- 18%
- Rain frequency
- 57% of days
Frequently asked
Is Key West or Miami warmer in May?
Miami runs warmer by day in May. Key West averages highs of 82°F (highs n=248 days); Miami averages highs of 85°F (highs n=248 days) (ERA5 2018–2025). Historical averages, not a forecast.
Does it rain more in Key West or Miami in May?
Miami is measurably wetter than Key West. Days with measurable rain: Key West 38%, Miami 57% (n=248 and n=248 days). ERA5 2018–2025; historical, not a forecast.
Which is sunnier in May, Key West or Miami?
Key West edges out Miami for sun in May: 33% clear historically versus 20% (8-year ERA5 average, a 13-point gap). Miami also sees measurably more rain than Key West this month (57% vs 38% of days). Both are viable — Key West is the safer bet.
Compare Key West vs Miami 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.