September weather in Trinity, TX
The average temperature in Trinity in September is 79.2°F (68.7°F–89.7°F). Average precipitation: 3.22 inches.
September is a fall month in Trinity, and is warmer than the annual average of 68.7°F. Daily temperatures swing about 21°F between overnight low and afternoon high. Expect about 9 days with precipitation. Daylight averages about 12h 11m. For travel, September is hot.
Avg High
89.7°F
Avg Low
68.7°F
Precipitation
3.22 in
Daylight
12h 11m
September records in Trinity
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 107.1°F (2000) | -15.0°F (1997) | 3.61 in (2003) |
| September 2 | 105.1°F (2000) | 66.9°F (2009) | 3.91 in (2003) |
| September 3 | 107.1°F (2000) | 69.1°F (2006) | 1.45 in (2024) |
| September 4 | 109.9°F (2000) | 66.9°F (2008) | 0.60 in (1999) |
| September 5 | 106.0°F (2023) | 63.0°F (2005) | 0.83 in (2020) |
| September 6 | 104.0°F (2023) | 53.1°F (2011) | 0.23 in (1998) |
| September 7 | 108.0°F (2023) | 55.9°F (2011) | 1.68 in (2007) |
| September 8 | 111.0°F (2023) | 57.0°F (2011) | 0.46 in (2013) |
| September 9 | 97.0°F (1997) | 55.9°F (2024) | 2.54 in (2001) |
| September 10 | 97.0°F (2023) | 57.9°F (2012) | 0.52 in (2005) |
| September 11 | 100.9°F (2011) | 59.0°F (2012) | 5.05 in (1998) |
| September 12 | 102.0°F (2011) | 57.9°F (2017) | 0.59 in (2018) |
| September 13 | 104.0°F (2011) | 57.0°F (2015) | 4.90 in (2008) |
| September 14 | 100.9°F (2011) | 57.9°F (2015) | 1.47 in (2012) |
| September 15 | 97.0°F (2005) | 57.9°F (1999) | 1.43 in (2024) |
| September 16 | 97.0°F (2004) | 55.0°F (1999) | 0.75 in (2012) |
| September 17 | 99.0°F (2004) | 52.0°F (2000) | 1.80 in (2002) |
| September 18 | 98.1°F (2004) | 53.1°F (2000) | 2.32 in (2006) |
| September 19 | 97.0°F (2005) | 59.0°F (2000) | 0.84 in (2011) |
| September 20 | 99.0°F (2005) | 55.9°F (2006) | 2.16 in (2013) |
| September 21 | 100.9°F (2005) | 57.0°F (2002) | 0.74 in (2003) |
| September 22 | 100.0°F (2005) | 50.0°F (1999) | 1.09 in (2020) |
| September 23 | 98.1°F (2022) | 48.9°F (1999) | 0.87 in (2006) |
| September 24 | 97.0°F (2023) | 54.0°F (2014) | 0.62 in (2000) |
| September 25 | 100.0°F (2011) | 53.1°F (2000) | 1.21 in (2023) |
| September 26 | 100.0°F (2005) | 46.0°F (2000) | 0.93 in (2018) |
| September 27 | 97.0°F (2005) | 48.0°F (2000) | 0.21 in (2007) |
| September 28 | 98.1°F (2011) | 48.0°F (2000) | 0.97 in (2013) |
| September 29 | 98.1°F (2011) | 50.0°F (2000) | 2.11 in (2012) |
| September 30 | 95.0°F (2019) | 46.9°F (1999) | 0.21 in (2012) |