September weather in Mont Belvieu, TX
The average temperature in Mont Belvieu in September is 78.8°F (69.0°F–88.5°F). Average precipitation: 6.41 inches.
September is a fall month in Mont Belvieu, and is warmer than the annual average of 68.7°F. Daily temperatures swing about 19.5°F between overnight low and afternoon high. Expect about 10 days with precipitation. Daylight averages about 12h 10m. For travel, September is a wet month.
Avg High
88.5°F
Avg Low
69.0°F
Precipitation
6.41 in
Daylight
12h 10m
September records in Mont Belvieu
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 107.1°F (2000) | 57.9°F (2023) | 4.80 in (1970) |
| September 2 | 106.0°F (2000) | 59.0°F (2023) | 3.34 in (2007) |
| September 3 | 102.9°F (2000) | 57.9°F (2023) | 2.05 in (2018) |
| September 4 | 106.0°F (2000) | 59.0°F (1952) | 1.65 in (1990) |
| September 5 | 109.0°F (2000) | 59.0°F (1952) | 1.40 in (1967) |
| September 6 | 107.1°F (2000) | 60.1°F (1953) | 3.15 in (1958) |
| September 7 | 98.1°F (2023) | 60.1°F (2017) | 3.72 in (1986) |
| September 8 | 100.9°F (2023) | 57.9°F (1988) | 4.96 in (2002) |
| September 9 | 102.9°F (2023) | 57.9°F (1988) | 1.60 in (2009) |
| September 10 | 102.9°F (2023) | 54.0°F (2022) | 7.40 in (1971) |
| September 11 | 97.0°F (2023) | 62.1°F (1988) | 6.19 in (1998) |
| September 12 | 97.0°F (1982) | 57.0°F (1959) | 5.30 in (1961) |
| September 13 | 96.1°F (1982) | 55.0°F (2022) | 3.60 in (1951) |
| September 14 | 96.1°F (2011) | 57.9°F (2018) | 4.46 in (2021) |
| September 15 | 97.0°F (2011) | 57.0°F (1993) | 1.71 in (2023) |
| September 16 | 97.0°F (1962) | 57.0°F (1989) | 1.90 in (1964) |
| September 17 | 97.0°F (2004) | 54.0°F (1961) | 2.50 in (1964) |
| September 18 | 97.0°F (1995) | 57.0°F (1961) | 3.14 in (2019) |
| September 19 | 97.0°F (1956) | 50.0°F (2001) | 3.80 in (2014) |
| September 20 | 97.0°F (1956) | 55.0°F (2001) | 4.10 in (2019) |
| September 21 | 98.1°F (2005) | 55.0°F (2006) | 5.10 in (2013) |
| September 22 | 102.0°F (2005) | 48.0°F (1983) | 5.56 in (1957) |
| September 23 | 100.0°F (2005) | 50.0°F (1983) | 3.04 in (1997) |
| September 24 | 95.0°F (1998) | 50.0°F (1983) | 2.35 in (2005) |
| September 25 | 93.9°F (1956) | 50.0°F (1983) | 2.74 in (1957) |
| September 26 | 97.0°F (2005) | 48.9°F (1983) | 2.66 in (2007) |
| September 27 | 97.0°F (2005) | 52.0°F (2000) | 2.45 in (1946) |
| September 28 | 97.0°F (1956) | 53.1°F (1993) | 4.05 in (1954) |
| September 29 | 96.1°F (1998) | 41.0°F (1967) | 2.22 in (1999) |
| September 30 | 96.1°F (1998) | 50.0°F (1949) | 3.55 in (1985) |