Slidell Average Temperature by Month

This page shows the average temperature in each month of the year in Slidell, Louisiana. It is based on NOAA data for the years 1991–2020.
What's the Hottest Month in Slidell?
In Slidell, Louisiana, the warmest month is July, with an average daily high temperature of 90.1 °F and an average low of 73.8 °F.
What's the Coldest Month in Slidell?
In Slidell, Louisiana, the coolest month is January, with an average daily high temperature of 61.3 °F and an average low of 41.6 °F.
Month Avg. High Avg. Low
January 61.3 °F 41.6 °F
February 64.8 °F 45.6 °F
March 70.8 °F 51.4 °F
April 76.7 °F 57.7 °F
May 83.6 °F 65.7 °F
June 88.5 °F 71.9 °F
July 90.1 °F 73.8 °F
August 90.3 °F 73.5 °F
September 87.1 °F 69.6 °F
October 79.8 °F 59.2 °F
November 70.3 °F 49.2 °F
December 63.2 °F 43.8 °F
Year 77.3 °F 58.7 °F
Weather Station Details
Years Station Coordinates
1956–2024 Slidell location
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