September weather in Key Colony Beach, FL
The average temperature in Key Colony Beach in September is 84.2°F (78.4°F–89.9°F). Average precipitation: 6.37 inches.
September is a fall month in Key Colony Beach, and is warmer than the annual average of 78.8°F. Daily temperatures swing about 11.5°F between overnight low and afternoon high. Expect about 15 days with precipitation. Daylight averages about 12h 8m. For travel, September is a wet month.
Avg High
89.9°F
Avg Low
78.4°F
Precipitation
6.37 in
Daylight
12h 8m
September records in Key Colony Beach
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 95.0°F (2022) | 77.0°F (2003) | 0.75 in (2025) |
| September 2 | 96.1°F (2022) | 77.0°F (1999) | 0.68 in (2005) |
| September 3 | 93.9°F (2022) | 75.9°F (2018) | 0.53 in (2018) |
| September 4 | 95.0°F (2002) | 73.0°F (2006) | 2.15 in (2010) |
| September 5 | 93.9°F (2001) | 75.0°F (2004) | 1.29 in (2004) |
| September 6 | 95.0°F (2022) | 73.9°F (2002) | 2.46 in (2010) |
| September 7 | 95.0°F (2022) | 73.0°F (1999) | 0.70 in (1999) |
| September 8 | 95.0°F (2022) | 73.9°F (2007) | 1.25 in (2007) |
| September 9 | 93.9°F (2011) | 72.0°F (2007) | 2.30 in (2002) |
| September 10 | 93.9°F (2015) | 73.9°F (2013) | 1.24 in (2000) |
| September 11 | 96.1°F (2022) | 75.0°F (2013) | 0.60 in (2002) |
| September 12 | 96.1°F (2022) | 73.9°F (2001) | 8.13 in (2020) |
| September 13 | 95.0°F (2015) | 73.0°F (2021) | 1.84 in (2014) |
| September 14 | 95.0°F (2023) | 75.9°F (2001) | 0.71 in (2001) |
| September 15 | 93.9°F (2022) | 75.0°F (1998) | 0.68 in (1998) |
| September 16 | 97.0°F (2023) | 73.0°F (2015) | 2.55 in (2010) |
| September 17 | 97.0°F (2023) | 73.0°F (2013) | 2.17 in (2022) |
| September 18 | 93.9°F (2023) | 73.0°F (2007) | 1.40 in (2007) |
| September 19 | 96.1°F (2023) | 72.0°F (2001) | 3.56 in (2001) |
| September 20 | 95.0°F (2023) | 75.0°F (2001) | 1.88 in (2005) |
| September 21 | 93.0°F (2023) | 73.9°F (2012) | 1.60 in (2023) |
| September 22 | 93.0°F (2006) | 73.9°F (2012) | 1.26 in (2012) |
| September 23 | 93.0°F (2020) | 73.0°F (1999) | 1.93 in (2023) |
| September 24 | 93.0°F (2006) | 73.0°F (1999) | 1.11 in (1999) |
| September 25 | 93.9°F (2022) | 73.0°F (1999) | 1.37 in (1999) |
| September 26 | 93.0°F (2002) | 72.0°F (2001) | 5.28 in (2007) |
| September 27 | 93.9°F (2006) | 71.1°F (2016) | 1.63 in (2016) |
| September 28 | 95.0°F (2006) | 73.0°F (2001) | 1.76 in (2023) |
| September 29 | 91.0°F (2002) | 71.1°F (2001) | 3.58 in (2010) |
| September 30 | 91.0°F (2002) | 72.0°F (2008) | 2.59 in (2008) |