September weather in Port St. Lucie, FL
The average temperature in Port St. Lucie in September is °F (°F–°F). Average precipitation: 7.70 inches.
September is a fall month in Port St. Lucie, and is cooler than the annual average of 0°F. Daylight averages about 12h 9m.
Avg High
°F
Avg Low
°F
Precipitation
7.70 in
Daylight
12h 9m
September records in Port St. Lucie
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 91.9°F (2005) | 68.0°F (2013) | 1.06 in (1999) |
| September 2 | 91.9°F (2005) | 70.0°F (1999) | 2.00 in (1998) |
| September 3 | 91.9°F (2005) | 62.1°F (1999) | 0.14 in (2008) |
| September 4 | 91.9°F (2005) | 68.0°F (2001) | 1.00 in (2018) |
| September 5 | 91.0°F (2017) | 68.0°F (2000) | 2.35 in (2006) |
| September 6 | 93.0°F (2019) | 68.0°F (2000) | 1.79 in (2005) |
| September 7 | 93.0°F (2019) | 62.1°F (1999) | 0.40 in (2018) |
| September 8 | 91.9°F (1999) | 64.0°F (1999) | 1.00 in (2015) |
| September 9 | 93.0°F (2019) | 68.0°F (2014) | 2.23 in (2022) |
| September 10 | 91.0°F (2015) | 66.9°F (2001) | 2.31 in (2001) |
| September 11 | 91.9°F (2015) | 66.9°F (2001) | 1.44 in (2024) |
| September 12 | 91.9°F (2015) | 68.0°F (2001) | 2.21 in (2024) |
| September 13 | 91.9°F (2015) | 64.0°F (2000) | 1.04 in (1999) |
| September 14 | 91.9°F (2015) | 64.9°F (2000) | 1.68 in (2001) |
| September 15 | 91.0°F (2005) | 66.0°F (2000) | 0.40 in (2021) |
| September 16 | 91.0°F (2018) | 68.0°F (2005) | 1.29 in (2025) |
| September 17 | 91.0°F (2018) | 63.0°F (2001) | 1.47 in (2015) |
| September 18 | 90.0°F (2000) | 63.0°F (2001) | 2.39 in (2000) |
| September 19 | 91.9°F (2016) | 64.0°F (2001) | 1.29 in (2007) |
| September 20 | 91.9°F (2018) | 66.9°F (2001) | 2.40 in (2016) |
| September 21 | 90.0°F (2016) | 66.9°F (2001) | 2.01 in (2021) |
| September 22 | 89.1°F (2017) | 66.0°F (1999) | 1.30 in (2022) |
| September 23 | 89.1°F (1998) | 66.0°F (2006) | 0.66 in (2014) |
| September 24 | 91.0°F (2001) | 66.0°F (2006) | 1.38 in (2025) |
| September 25 | 90.0°F (2001) | 64.9°F (2019) | 4.05 in (2014) |
| September 26 | 91.0°F (2017) | 62.1°F (2008) | 0.70 in (2003) |
| September 27 | 91.9°F (2000) | 62.1°F (2008) | 1.94 in (1999) |
| September 28 | 91.0°F (2009) | 66.9°F (2008) | 0.11 in (2005) |
| September 29 | 91.0°F (2009) | 64.0°F (2009) | 1.10 in (2005) |
| September 30 | 91.0°F (2009) | 66.9°F (2009) | 1.48 in (2014) |