August weather in Key Biscayne, FL
The average temperature in Key Biscayne in August is 85.4°F (79.4°F–91.4°F). Average precipitation: 7.05 inches.
August is a summer month in Key Biscayne, and is warmer than the annual average of 78.7°F. Daily temperatures swing about 12°F between overnight low and afternoon high. Expect about 16 days with precipitation. Daylight averages about 12h 54m. For travel, August is a wet month.
Avg High
91.4°F
Avg Low
79.4°F
Precipitation
7.05 in
Daylight
12h 54m
August records in Key Biscayne
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| August 1 | 93.9°F (2023) | 75.0°F (2015) | 0.47 in (2007) |
| August 2 | 93.0°F (2015) | 73.0°F (2001) | 2.11 in (2001) |
| August 3 | 93.0°F (1999) | 73.9°F (1999) | 1.35 in (2004) |
| August 4 | 93.0°F (2017) | 72.0°F (2001) | 2.65 in (2004) |
| August 5 | 93.0°F (2019) | 75.0°F (2006) | 0.91 in (2024) |
| August 6 | 93.9°F (2023) | 73.0°F (2001) | 2.01 in (2003) |
| August 7 | 95.0°F (2023) | 73.0°F (2002) | 1.72 in (2002) |
| August 8 | 96.1°F (2023) | 71.1°F (2002) | 0.61 in (2004) |
| August 9 | 93.9°F (2023) | 71.1°F (2003) | 2.46 in (2006) |
| August 10 | 93.9°F (2019) | 73.9°F (2025) | 3.65 in (2025) |
| August 11 | 93.0°F (1999) | 73.0°F (2002) | 1.61 in (2010) |
| August 12 | 95.0°F (1999) | 73.0°F (2003) | 1.50 in (2019) |
| August 13 | 93.0°F (2019) | 73.0°F (2000) | 1.84 in (2019) |
| August 14 | 93.9°F (2019) | 73.9°F (2000) | 0.42 in (1998) |
| August 15 | 93.0°F (2014) | 73.0°F (2006) | 1.52 in (2021) |
| August 16 | 95.0°F (2023) | 73.9°F (2009) | 1.70 in (2009) |
| August 17 | 95.0°F (2022) | 73.9°F (2003) | 0.43 in (2024) |
| August 18 | 96.1°F (2022) | 73.0°F (2000) | 1.61 in (1999) |
| August 19 | 95.0°F (2022) | 73.9°F (2003) | 2.72 in (2008) |
| August 20 | 93.9°F (2025) | 72.0°F (2003) | 1.44 in (2020) |
| August 21 | 96.1°F (2025) | 72.0°F (2003) | 2.69 in (2003) |
| August 22 | 93.0°F (2020) | 75.0°F (2004) | 0.36 in (2008) |
| August 23 | 91.9°F (2014) | 73.9°F (2004) | 1.54 in (1999) |
| August 24 | 93.0°F (2014) | 73.9°F (1999) | 1.33 in (1999) |
| August 25 | 93.9°F (2014) | 72.0°F (2002) | 2.55 in (2012) |
| August 26 | 93.9°F (2014) | 72.0°F (2000) | 7.00 in (2005) |
| August 27 | 93.9°F (2022) | 73.0°F (2000) | 2.75 in (2012) |
| August 28 | 93.9°F (2019) | 73.0°F (2001) | 1.09 in (2012) |
| August 29 | 93.0°F (2017) | 73.9°F (2013) | 1.22 in (2019) |
| August 30 | 93.0°F (2014) | 75.0°F (2013) | 1.68 in (2011) |
| August 31 | 93.9°F (2022) | 75.0°F (2020) | 1.86 in (2016) |