Slidell weather by month
What a typical year looks like in Slidell, Louisiana: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Slidell Airport, 7 km from Slidell; records cover 1994–2026.
The year at a glance
- Precipitation a year
- 61.9 in1572 mm
- Snow a year
- Rare
- Last spring freeze
- Mar 4
- First fall freeze
- Nov 20
- Heating degree days
- 1,610
- Cooling degree days
- 2,631
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are 26°−3° (heating, 99%) and 97°36° (cooling, 1%).
Month by month
Slidell in January
Highs average 62°17° and lows 41°5°, with 5.6 in141 mm of precipitation in a typical January.
- Record high
- 83°28° (2022)
- Record low
- 8°−13° (2025)
- Heating degree days
- 434
- Cooling degree days
- 11
Slidell in February
Highs average 66°19° and lows 44°7°, with 4.1 in105 mm of precipitation in a typical February.
- Record high
- 85°29° (2023)
- Record low
- 15°−9° (1996)
- Heating degree days
- 296
- Cooling degree days
- 20
Slidell in March
Highs average 72°22° and lows 50°10°, with 4.9 in125 mm of precipitation in a typical March.
- Record high
- 87°31° (2020)
- Record low
- 22°−6° (1996)
- Heating degree days
- 177
- Cooling degree days
- 50
Slidell in April
Highs average 78°26° and lows 56°13°, with 5.2 in132 mm of precipitation in a typical April.
- Record high
- 91°33° (1999)
- Record low
- 32°0° (2000)
- Heating degree days
- 56
- Cooling degree days
- 117
Slidell in May
Highs average 85°29° and lows 64°18°, with 5.5 in139 mm of precipitation in a typical May.
- Record high
- 96°36° (2000)
- Record low
- 39°4° (2013)
- Heating degree days
- 4
- Cooling degree days
- 294
Slidell in June
Highs average 90°32° and lows 71°22°, with 6.1 in155 mm of precipitation in a typical June.
- Record high
- 103°39° (2011)
- Record low
- 55°13° (1995)
- Heating degree days
- 0
- Cooling degree days
- 459
Slidell in July
Highs average 91°33° and lows 73°23°, with 7.3 in184 mm of precipitation in a typical July.
- Record high
- 101°38° (2023)
- Record low
- 64°18° (1994)
- Heating degree days
- 0
- Cooling degree days
- 530
Slidell in August
Highs average 91°33° and lows 73°23°, with 7 in177 mm of precipitation in a typical August.
- Record high
- 108°42° (2023)
- Record low
- 58°14° (2015)
- Heating degree days
- 0
- Cooling degree days
- 528
Slidell in September
Highs average 88°31° and lows 69°20°, with 4.1 in105 mm of precipitation in a typical September.
- Record high
- 99°37° (2000)
- Record low
- 46°8° (1999)
- Heating degree days
- 1
- Cooling degree days
- 398
Slidell in OctoberThis month
Highs average 81°27° and lows 57°14°, with 3.7 in94 mm of precipitation in a typical October.
- Record high
- 97°36° (2019)
- Record low
- 31°−1° (2022)
- Heating degree days
- 49
- Cooling degree days
- 171
Slidell in November
Highs average 71°22° and lows 47°8°, with 3.9 in99 mm of precipitation in a typical November.
- Record high
- 90°32° (2022)
- Record low
- 23°−5° (2014)
- Heating degree days
- 219
- Cooling degree days
- 34
Slidell in December
Highs average 64°18° and lows 43°6°, with 4.5 in114 mm of precipitation in a typical December.
- Record high
- 84°29° (2021)
- Record low
- 17°−8° (1996)
- Heating degree days
- 374
- Cooling degree days
- 19