St. Martin Parish Climate
St. Martin Parish, Louisiana
Avg Annual Temp
67.8°F
Annual Precip
66.6"
Annual Snowfall
0.0"
Extreme Heat Days
69.85
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About St. Martin Parish Weather
A subtropical Louisiana climate
With an average annual temperature of 67.8°F, St. Martin Parish is much warmer than the typical U.S. county. This area experiences the high humidity and heavy rainfall characteristic of the Gulf Coast region.
Following the state temperature curve
The parish matches the Louisiana state average closely, coming in at 67.8°F versus the 67.0°F state baseline. It remains consistently warmer than the northern parishes while avoiding the absolute peak heat of the deep coast.
Wetter than nearby St. Landry
St. Martin Parish is significantly wetter than its neighbor St. Landry, receiving 66.6 inches of rain compared to 61.4 inches. Temperature-wise, both parishes stay within a fraction of a degree of each other year-round.
Mild winters and humid summers
Extreme heat hits 70 days per year here, which is notably lower than some inland neighbors. July temperatures average 81.5°F, while winter remains comfortable with a 53.8°F average and zero snow.
Invest in moisture management
Because the parish receives 66.6 inches of rain—well above the state average of 60.8—drainage and moisture control are top priorities for homeowners. Outdoor activities should be planned for the 53.8°F winter months to avoid the 70 days of extreme heat.
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.