September weather in Plano, TX
The average temperature in Plano in September is 77.2°F (67.1°F–87.3°F). Average precipitation: 3.30 inches.
September is a fall month in Plano, and is warmer than the annual average of 65.8°F. Daily temperatures swing about 20.2°F between overnight low and afternoon high. Expect about 6 days with precipitation. Daylight averages about 12h 12m. For travel, September is a comfortable month to visit.
Avg High
87.3°F
Avg Low
67.1°F
Precipitation
3.30 in
Daylight
12h 12m
September records in Plano
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 102.9°F (2013) | 66.9°F (2009) | 2.78 in (2003) |
| September 2 | 100.9°F (2011) | 68.0°F (2007) | 4.00 in (1988) |
| September 3 | 99.0°F (2011) | 68.0°F (2010) | 0.99 in (1953) |
| September 4 | 100.9°F (2025) | 64.0°F (2008) | 1.90 in (2001) |
| September 5 | 100.9°F (2023) | 61.0°F (2010) | 1.82 in (2007) |
| September 6 | 102.0°F (2023) | 60.1°F (2011) | 2.05 in (1973) |
| September 7 | 105.1°F (2023) | 55.0°F (2017) | 1.50 in (1977) |
| September 8 | 107.1°F (2023) | 55.9°F (2017) | 5.39 in (2010) |
| September 9 | 97.0°F (2014) | 60.1°F (2024) | 3.53 in (2020) |
| September 10 | 95.0°F (2019) | 55.9°F (2020) | 1.57 in (1955) |
| September 11 | 96.1°F (2011) | 57.9°F (2017) | 4.50 in (1961) |
| September 12 | 102.0°F (2011) | 55.0°F (2015) | 1.80 in (1989) |
| September 13 | 106.0°F (2011) | 54.0°F (2014) | 2.45 in (1988) |
| September 14 | 98.1°F (2024) | 57.9°F (2006) | 2.08 in (1981) |
| September 15 | 98.1°F (2024) | 59.0°F (2008) | 0.90 in (1967) |
| September 16 | 97.0°F (2013) | 53.1°F (2008) | 1.65 in (1964) |
| September 17 | 95.0°F (2016) | 53.1°F (2008) | 2.28 in (1974) |
| September 18 | 97.0°F (2024) | 57.9°F (2008) | 2.56 in (2003) |
| September 19 | 99.0°F (2024) | 55.9°F (2006) | 3.45 in (1958) |
| September 20 | 99.0°F (2024) | 57.0°F (2020) | 1.40 in (1993) |
| September 21 | 97.0°F (2019) | 57.0°F (2020) | 7.79 in (1964) |
| September 22 | 97.0°F (2022) | 55.9°F (2013) | 3.78 in (2018) |
| September 23 | 98.1°F (2023) | 54.0°F (2021) | 1.85 in (1955) |
| September 24 | 99.0°F (2023) | 52.0°F (2009) | 1.15 in (1968) |
| September 25 | 96.1°F (2022) | 59.0°F (2013) | 1.05 in (1993) |
| September 26 | 93.0°F (2013) | 53.1°F (2006) | 2.19 in (1980) |
| September 27 | 93.9°F (2023) | 52.0°F (2010) | 2.10 in (1973) |
| September 28 | 95.0°F (2023) | 52.0°F (2010) | 0.62 in (1980) |
| September 29 | 99.0°F (2011) | 52.0°F (2009) | 2.71 in (1980) |
| September 30 | 95.0°F (2024) | 55.0°F (2016) | 1.90 in (1954) |