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Key West in August: weather, sea & travel advice
This month's data profile
Rain shapes the decision
Key West in August is climatically mixed. The average daily high is around 30 °C, and the sea is about 30 °C. With about 26 rainy days it is very wet.
Historical monthly averages, not a weather forecast. Individual days and years can differ substantially.
Rank among 12 monthly averages
52/100 · #12
Warmth
#1
Dryness
#12
Sun
#5
Sea warmth
#1
Published best categories: none
Key West · AugustPhoto: Ebyabe · CC BY-SA 3.0Climate facts
- Average high
- 30 °C
- Average low
- 29 °C
- Sea
- 30 °C
- Rainy days (est.)
- 26 rainy days (est.)
- Sun (est.)
- 8 h/day
- Humidity
- 75 %
Climate evidence with direct month comparison
The highlighted row is the selected month. Precipitation total and rainy days are separate monthly averages.
| Month | Avg high °C | Avg low °C | Rainy days (est.) | Precipitation mm | Sun h/day (est.) | Humidity % | Wind m/s | Sea °C | Score |
|---|---|---|---|---|---|---|---|---|---|
| July | 30 | 29 | 25 | 145 | 8.0 | 76 | 3.7 | 30 | 55 |
| August (selected) | 30 | 29 | 26 | 188 | 7.6 | 75 | 3.8 | 30 | 52 |
| September | 29 | 29 | 24 | 198 | 6.7 | 77 | 4.0 | 30 | 54 |
How do the previous and next months compare?
Baseline: August (52/100)
Positive and negative values show the change from the selected month.
| Score Δ | Average high Δ | Average low Δ | Rainy days Δ | Rain Δ | Sun Δ | Humidity Δ | Wind Δ | Sea Δ | |
|---|---|---|---|---|---|---|---|---|---|
| July | +3 | -0.3 °C | -0.3 °C | -1.5 | -43.4 mm | +0.4 h | +0.2 % | -0.1 m/s | -0.5 °C |
| September | +2 | -0.5 °C | -0.5 °C | -1.8 | +10.2 mm | -0.9 h | +1.3 % | +0.2 m/s | -0.5 °C |
All twelve months in context
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Useful next decisions
Frequently asked questions
How warm is Key West in August?
The average daily high is around 30 °C, with an average daily low of about 29 °C.
Can you swim in Key West in August?
The sea is about 30 °C (very warm).
Does it rain a lot in Key West in August?
The curated estimate is about 26 rainy days per month, not a directly measured long-term average. Total precipitation averages around 188 mm for the month. A rainy day does not mean all-day rain.
When is the best time to visit Key West?
By the climate score, February, March, April and December are the strongest months for Key West. For a beach trip: February, March, April and November. August is not among them.