St. Tammany Parish Climate
St. Tammany Parish, Louisiana
Avg Annual Temp
67.4°F
Annual Precip
64.2"
Annual Snowfall
0.1"
Extreme Heat Days
75.63333333333334
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About St. Tammany Parish Weather
Subtropical heat on the Northshore
St. Tammany Parish maintains an average annual temperature of 67.4°F, significantly higher than the U.S. national median. The climate is defined by high humidity and heavy annual precipitation totaling 64.2 inches.
Typical Louisiana thermal patterns
The parish sits slightly above the state average of 67.0°F. While it is cooler than the coastal parishes to the south, it still experiences 76 days of extreme heat annually.
Wetter than Tangipahoa Parish
St. Tammany is slightly warmer and wetter than its neighbor Tangipahoa, which averages 66.8°F and 63.6 inches of rain. Both parishes share a similar Northshore climate profile with nearly identical winter averages.
High humidity and rare snow
Summer averages 80.9°F with 76 days of extreme heat over 90°F. Winters are mild at 53.1°F, though the parish occasionally sees a trace of snow, averaging 0.1 inches annually.
Prepare for wet summers
With 64.2 inches of annual rain, high-capacity drainage systems are essential for local properties. Residents should plan outdoor maintenance around the 76 extreme heat days that occur mostly between June and August.
Frequently Asked Questions
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Data source: NOAA National Centers for Environmental Information (NCEI), U.S. Climate Normals 1991-2020.
Climate normals are 30-year averages of weather variables computed from 1991 to 2020. Station data is aggregated to county level using spatial averaging. Data is informational only — not a substitute for official National Weather Service forecasts or emergency weather warnings.