August · United States
Best time to visit Key West in August Weather, crowds & prices
Weather in Key West in August
Average temperature 30°C, 455 mm of rain, about 28 days with 6+ hours of sunshine and 76% humidity — based on the five most recent complete years of ERA5 data (2021–2025).
August score
6.3/10
Ranked #10 of 12 months
- Avg temp
- 30°C
- Rainfall
- 455 mm
- Humidity
- 76%
- Days with 6h+ sun
- 28
- Crowd Density
- Moderate Crowds
- Average Expenses
- $$ · Moderate Cost ($$)
August in Key West scores 6.3/10 for beach and coastal travel - ranked #10 of 12. Expect around 30°C, 455 mm of rain, and roughly 28 days with 6+ hours of sunshine this month.
Conch pastel lanes at the end of Overseas Highway at their best in January-April.
August in Key West — workable with trade-offs
Days in August average 30°C (86°F) and humidity near 76% — front-load outdoor plans before the heat builds and treat the middle of the day as indoor time.
This is the year's wettest stretch at 455 mm, but with about 28 days with 6+ hours of sunshine it is not a total loss; an indoor fallback covers the risk.
That is 6.3/10 on the same scale — 10th of 12 months, versus 8.6/10 for the best month here.
Pack the lightest breathable clothing you own, a hat, and more water than feels necessary, a proper rain shell rather than an umbrella.
Expect mid-season pricing, and crowds are moderate.
If your dates are flexible, March is materially better in Key West — 2.3 points higher on the same scale.
Frequently asked
- What is the weather like in Key West in August?
- In August, Key West averages 30°C, 455 mm of rain, and about 28 days with 6+ hours of sunshine. Its climate-comfort score is 6.3/10.
- Is August a good time to visit Key West?
- August earns a 6.3/10 climate-comfort score. Use the year-round chart to weigh the weather against your budget and crowd preferences.
- How much does it rain in Key West in August?
- Expect about 455 mm of rain in August. Average humidity is 76% and there are about 28 days with 6+ hours of sunshine.
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