September weather in Grand Coteau, LA
The average temperature in Grand Coteau in September is 78.0°F (67.7°F–88.3°F). Average precipitation: 5.14 inches.
September is a fall month in Grand Coteau, and is warmer than the annual average of 68.3°F. Daily temperatures swing about 20.6°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
88.3°F
Avg Low
67.7°F
Precipitation
5.14 in
Daylight
12h 10m
September records in Grand Coteau
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 102.9°F (2000) | 57.9°F (1915) | 3.90 in (2008) |
| September 2 | 104.0°F (2000) | 57.0°F (1967) | 3.50 in (2001) |
| September 3 | 106.0°F (2000) | 55.9°F (2011) | 3.95 in (2011) |
| September 4 | 104.0°F (2000) | 55.9°F (1952) | 2.16 in (2008) |
| September 5 | 102.0°F (2000) | 55.0°F (1974) | 5.04 in (1973) |
| September 6 | 98.1°F (1948) | 54.0°F (2011) | 1.75 in (1994) |
| September 7 | 99.0°F (2023) | 48.9°F (2011) | 3.42 in (1893) |
| September 8 | 99.0°F (2023) | 53.1°F (2011) | 2.62 in (1974) |
| September 9 | 97.0°F (1936) | 55.0°F (2011) | 1.99 in (1935) |
| September 10 | 100.9°F (1980) | 57.0°F (1920) | 4.15 in (1965) |
| September 11 | 99.0°F (1939) | 55.9°F (1907) | 4.00 in (1998) |
| September 12 | 99.0°F (1980) | 52.0°F (1940) | 4.90 in (1998) |
| September 13 | 98.1°F (1921) | 50.0°F (1940) | 2.62 in (2007) |
| September 14 | 99.0°F (1921) | 46.9°F (1902) | 2.69 in (1961) |
| September 15 | 100.0°F (1921) | 48.9°F (1902) | 1.95 in (2021) |
| September 16 | 97.0°F (1900) | 51.1°F (2011) | 5.75 in (1971) |
| September 17 | 98.1°F (1927) | 54.0°F (2000) | 2.94 in (1963) |
| September 18 | 100.9°F (1927) | 50.0°F (1903) | 1.82 in (1969) |
| September 19 | 98.1°F (1936) | 46.9°F (1901) | 3.56 in (1932) |
| September 20 | 98.1°F (2005) | 50.0°F (1901) | 5.06 in (1979) |
| September 21 | 98.1°F (1921) | 44.1°F (2011) | 2.10 in (2013) |
| September 22 | 97.0°F (1993) | 44.1°F (1983) | 2.58 in (1984) |
| September 23 | 98.1°F (1921) | 48.0°F (1982) | 2.03 in (1970) |
| September 24 | 98.1°F (1936) | 48.0°F (1990) | 7.80 in (2005) |
| September 25 | 97.0°F (1921) | 50.0°F (1994) | 4.84 in (1951) |
| September 26 | 96.1°F (1921) | 46.9°F (1899) | 2.00 in (1913) |
| September 27 | 95.0°F (1936) | 45.0°F (1942) | 4.80 in (1913) |
| September 28 | 96.1°F (1953) | 44.1°F (1899) | 3.50 in (1939) |
| September 29 | 96.1°F (1953) | 42.1°F (1967) | 3.96 in (1898) |
| September 30 | 97.0°F (1928) | 44.1°F (1967) | 2.60 in (1958) |