September weather in Slidell, LA
The average temperature in Slidell in September is 78.2°F (69.7°F–86.7°F). Average precipitation: 4.95 inches.
September is a fall month in Slidell, and is warmer than the annual average of 67.6°F. Daily temperatures swing about 17°F between overnight low and afternoon high. Expect about 10 days with precipitation. Daylight averages about 12h 10m. For travel, September is a comfortable month to visit.
Avg High
86.7°F
Avg Low
69.7°F
Precipitation
4.95 in
Daylight
12h 10m
September records in Slidell
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 96.1°F (1964) | 63.0°F (1968) | 1.63 in (2008) |
| September 2 | 99.0°F (1989) | 60.1°F (1967) | 5.02 in (2008) |
| September 3 | 97.0°F (1964) | 64.0°F (1987) | 6.10 in (2011) |
| September 4 | 97.0°F (1990) | 60.1°F (1974) | 2.85 in (2011) |
| September 5 | 98.1°F (2000) | 57.9°F (1974) | 5.16 in (2023) |
| September 6 | 95.0°F (1970) | 57.9°F (2011) | 3.54 in (1977) |
| September 7 | 95.0°F (1969) | 55.0°F (1988) | 1.65 in (2009) |
| September 8 | 95.0°F (1972) | 57.9°F (2011) | 3.24 in (1974) |
| September 9 | 96.1°F (1972) | 57.9°F (2011) | 1.49 in (1988) |
| September 10 | 99.0°F (1980) | 57.9°F (1956) | 2.45 in (1961) |
| September 11 | 99.0°F (1980) | 55.0°F (1976) | 2.40 in (1998) |
| September 12 | 98.1°F (1980) | 55.0°F (1976) | 5.75 in (2024) |
| September 13 | 93.9°F (1965) | 37.9°F (2002) | 1.62 in (1998) |
| September 14 | 95.0°F (1965) | 55.0°F (1964) | 1.36 in (1961) |
| September 15 | 96.1°F (1980) | 59.0°F (1964) | 2.80 in (2021) |
| September 16 | 95.0°F (1980) | 55.9°F (1961) | 3.65 in (1963) |
| September 17 | 95.0°F (1982) | 55.9°F (1961) | 2.79 in (1963) |
| September 18 | 95.0°F (1972) | 54.0°F (1981) | 5.35 in (1957) |
| September 19 | 96.1°F (2005) | 48.9°F (1981) | 0.84 in (1982) |
| September 20 | 96.1°F (2005) | 50.0°F (1981) | 1.84 in (2011) |
| September 21 | 96.1°F (2005) | 52.0°F (1983) | 1.92 in (1979) |
| September 22 | 95.0°F (1997) | 46.0°F (1983) | 1.75 in (1985) |
| September 23 | 95.0°F (1971) | 46.0°F (1999) | 1.55 in (1956) |
| September 24 | 93.0°F (1980) | 48.9°F (1999) | 4.67 in (1956) |
| September 25 | 93.0°F (1961) | 48.9°F (1975) | 2.34 in (2002) |
| September 26 | 93.0°F (1980) | 46.9°F (1975) | 6.82 in (2002) |
| September 27 | 93.0°F (1986) | 46.9°F (1975) | 0.87 in (1972) |
| September 28 | 91.9°F (1972) | 46.9°F (1975) | 1.30 in (1967) |
| September 29 | 93.0°F (1981) | 42.1°F (1967) | 1.56 in (2021) |
| September 30 | 93.0°F (1981) | 42.1°F (1967) | 5.91 in (1956) |