Florida Keys Weather in August
During August, Florida Keys experiences very high daytime temperatures of 32°C (90°F) and cooler nights around 27°C (81°F). Expect quite a bit of rainfall. Around 159 mm (6.3 in) is typical.
Rainfall in Florida Keys in August
Climate statistics over the past 30 years suggest around 21 days of rain, with 159 mm (6.3 in) average for the month. Expect frequent rainfall this month, and not just light drizzle. When it rains, it tends to come down hard.
Temperature in Florida Keys in August
In August, Florida Keys gets very high temperatures, with highs of 32°C (90°F). Nights cool to around 27°C (81°F). Sunshine and humidity can make it feel even warmer than the raw temperature suggests. With overnight lows of 27°C (81°F), nights stay very warm. Air conditioning makes a real difference if you're sensitive to heat. A cold shower before bed can also help you get to sleep more comfortably. Typical temperatures can be misleading; some days will be hotter. Prepare with light clothing and plenty of hydration to stay cool.
Sunshine in Florida Keys in August
With approximately 308 hours of sunshine, the days are filled with clear skies. It makes it a perfect month for being outside.If your ideal day consists of dry skies and pleasant temperatures, January, February, March, April, May, November and December typically offer the best circumstances for Florida Keys.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United States of America, check out our Florida Keys's climate page.
Florida Keys Temperature in August
Min Temperature
27°C (81°F)
Max Temperature
32°C (90°F)
Chance of Rain
70%
Precipitation
159 mm (6.3 in)
Rainy days
21 days
Humidity
74%
Sunshine
308 hours
Percentage Sunshine
76%
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Florida Keys typically stay consistent throughout August, with daily highs averaging around 32°C (90°F). Nights are warm, with lows around 26°C (79°F).
Average temperatures in August
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in August
Historical weather for Florida Keys in August
Browse day-by-day weather records for Florida Keys spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Florida Keys historical weather extremes in August
The extremes listed below come from historical weather data collected in Florida Keys from 1976 through 2025.
- The warmest day in August was on August 9, 1987, with a maximum of 36°C (97°F).
- The coldest August day was on August 15, 1988, with a maximum of 26°C (79°F).
- Florida Keys registered its coldest August night on August 23, 1996, with temperatures dropping to 21°C (70°F).
Best Places in the United States of America in August
Find out more about the weather in the United States of America and which places have the best travel conditions in this month. See all of the United States of America in August →
perfect weather
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What to Wear in Florida Keys in August
Warm temperatures in August make for comfortable sightseeing weather. Pack breathable fabrics like cotton shirts, knee-length shorts or skirts, and comfortable walking shoes. A thin long sleeve for indoor spaces is handy. Heavy rain is guaranteed, please bring a good poncho and waterproof everything! Don't forget sun protection, sunglasses, sunscreen, and a hat. These are all good ideas with this much sunshine.What To Do in Florida Keys in August
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United States of America, check out our Florida Keys's climate page.
Temperature Rainfall Sunshine Humidity
See the full Florida Keys climate overview or explore weather in the United States of America.
