September weather in Castle Hills, TX
The average temperature in Castle Hills in September is 79.9°F (69.6°F–90.1°F). Average precipitation: 3.88 inches.
September is a fall month in Castle Hills, and is warmer than the annual average of 69.6°F. Daily temperatures swing about 20.5°F between overnight low and afternoon high. Expect about 7 days with precipitation. Daylight averages about 12h 10m. For travel, September is hot.
Avg High
90.1°F
Avg Low
69.6°F
Precipitation
3.88 in
Daylight
12h 10m
September records in Castle Hills
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 102.0°F (1951) | 63.0°F (1950) | 0.82 in (1990) |
| September 2 | 104.0°F (2000) | 63.0°F (1987) | 1.83 in (2001) |
| September 3 | 104.0°F (2000) | 61.0°F (1974) | 6.07 in (2018) |
| September 4 | 109.0°F (2000) | 55.9°F (1974) | 1.57 in (1953) |
| September 5 | 111.0°F (2000) | 54.0°F (1974) | 1.90 in (2003) |
| September 6 | 102.0°F (2000) | 53.1°F (1974) | 2.62 in (1980) |
| September 7 | 102.9°F (2023) | 55.9°F (1974) | 3.69 in (2010) |
| September 8 | 104.0°F (2023) | 60.1°F (1957) | 2.83 in (2010) |
| September 9 | 102.0°F (2023) | 57.0°F (1957) | 2.25 in (2018) |
| September 10 | 100.0°F (2023) | 57.0°F (2020) | 1.97 in (2009) |
| September 11 | 100.0°F (2000) | 55.9°F (1968) | 1.67 in (2003) |
| September 12 | 100.9°F (2011) | 55.9°F (1968) | 1.33 in (1990) |
| September 13 | 100.0°F (2008) | 59.0°F (1960) | 5.13 in (1978) |
| September 14 | 99.0°F (2011) | 62.1°F (1959) | 1.24 in (2000) |
| September 15 | 98.1°F (1953) | 57.0°F (1989) | 4.71 in (1946) |
| September 16 | 99.0°F (1954) | 57.0°F (1993) | 2.54 in (1973) |
| September 17 | 98.1°F (1997) | 57.0°F (1951) | 1.87 in (2006) |
| September 18 | 99.0°F (2019) | 52.0°F (1968) | 2.43 in (1983) |
| September 19 | 100.0°F (2019) | 46.0°F (1981) | 2.20 in (2002) |
| September 20 | 100.0°F (1947) | 51.1°F (1981) | 3.21 in (1995) |
| September 21 | 98.1°F (2023) | 54.0°F (1983) | 2.45 in (1967) |
| September 22 | 99.0°F (2005) | 46.0°F (1983) | 4.76 in (1957) |
| September 23 | 99.0°F (2000) | 48.9°F (1999) | 1.74 in (1957) |
| September 24 | 102.0°F (2005) | 51.1°F (1947) | 1.78 in (1996) |
| September 25 | 105.1°F (2005) | 50.0°F (1989) | 3.27 in (1946) |
| September 26 | 102.9°F (2005) | 46.9°F (1975) | 6.54 in (1973) |
| September 27 | 102.0°F (2005) | 48.0°F (2000) | 3.13 in (1946) |
| September 28 | 104.0°F (2005) | 46.9°F (1967) | 2.19 in (2012) |
| September 29 | 97.0°F (2019) | 48.0°F (1967) | 2.03 in (1985) |
| September 30 | 96.1°F (2019) | 46.9°F (1985) | 0.48 in (1954) |