Key West in August
In August, Key West averages 30°C (85°F) during the day and 28°C (82°F) at night, with frequent rain — about 25 days of the month see precipitation (109 mm total).
ShoulderConditions are warm and beach-friendly. Expect daily rain or showers, often in heavy bursts.
It's peak hurricane season in Key West during August. Travel is possible but expect storm risk, possible flight disruption, and generally lower travel insurance coverage.
How August compares to the rest of the year in Key West
August is one of the warmest months in Key West (1st of 12) and one of the wettest months (2nd of 12). Daytime temperature runs 3°C above the annual average (26°C). August runs roughly the same as July (30°C) and cools 1°C in September (29°C).
August sunrise & sunset in Key West
Times shown for Key West local time (America/New_York), calculated for the 15th of August. They shift by a few minutes day to day across the month.
Photography light in Key West — August
Golden-hour and blue-hour windows for the 15th of August, in Key West's local time. Use these for soft warm light (golden) or cool architectural twilight (blue).
📅 When to book — Key West in August
Travel writers usually only tell you when to go. Here's when to book flights and lodging for the best mix of price and availability, based on August's tier (Shoulder) and Key West's popularity.
Crowds & pricing — August in Key West
Key West is in a shoulder season month — fewer crowds, slightly lower prices, and a calmer atmosphere than peak weeks. Most major sights stay open with normal hours, though a handful of seasonal restaurants or boat trips may run reduced schedules. Many regulars consider these months the best time to visit because you trade a small amount of weather reliability for a much more pleasant on-the-ground experience.
Why this tier: Northern Hemisphere summer holidays peak hazard season (1 active)
Sun & mosquito risk — August in Key West
UV is a clear-sky sea-level estimate — clouds, altitude, and reflective surfaces (snow, water) shift it ±30%. Mosquito risk is climate-derived only; for current disease advisories (dengue, malaria, zika) check the CDC or WHO travel pages before your trip.
Sea temperature in Key West — August
Across the year Key West's sea swings from 24.2°C (January) to 31.4°C (August) — August sits at 31.4°C.
Key West in other months
| Month | Avg high | Avg low | Rainfall | Rain days | Snow days |
|---|---|---|---|---|---|
| January | 23°C / 73°F | 20°C / 69°F | 52 mm | 16 | — |
| February | 24°C / 74°F | 22°C / 71°F | 30 mm | 13 | — |
| March | 24°C / 76°F | 23°C / 73°F | 34 mm | 14 | — |
| April | 26°C / 78°F | 24°C / 76°F | 40 mm | 15 | — |
| May | 27°C / 81°F | 25°C / 78°F | 93 mm | 18 | — |
| June | 29°C / 83°F | 27°C / 80°F | 116 mm | 24 | — |
| July | 30°C / 85°F | 28°C / 82°F | 91 mm | 23 | — |
| August | 30°C / 85°F | 28°C / 82°F | 109 mm | 25 | — |
| September | 29°C / 84°F | 27°C / 81°F | 159 mm | 26 | — |
| October | 28°C / 82°F | 26°C / 79°F | 132 mm | 25 | — |
| November | 26°C / 78°F | 24°C / 75°F | 76 mm | 19 | — |
| December | 24°C / 76°F | 22°C / 72°F | 56 mm | 14 | — |
Other cities with similar August weather
🌍 See the full ranked list of climate twins for Key West in August →
Frequently asked questions
How hot is Key West in August?
In August, Key West averages a high of 30°C (85°F) and a low of 28°C (82°F) — generally hot.
Does it rain a lot in Key West in August?
August is quite rainy in Key West, with about 25 rainy days on average.
Is August a good time to visit Key West?
August is hot but on the rainy side. It suits travelers who are comfortable with hot weather; check the month-by-month ranking to compare it against the rest of the year.
What should I pack for Key West in August?
Pack lightweight, breathable clothing, sunglasses and sunscreen, plus a compact umbrella or rain jacket. See the full August packing list for Key West for a complete, climate-based checklist.
Check the live 10-day forecast and sunrise/sunset.