Mermentau, LA Weather & Growing Conditions
Today
93°F
Sunny then Chance Showers And Thunderstorms
A chance of showers and thunderstorms after 1pm. Sunny, with a high near 93. Heat index values as high as 101. East wind 0 to 10 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 93°F | Sunny then Chance Showers And Thunderstorms | 0 to 10 mph E | 26% |
| Tonight | 77°F | Slight Chance Showers And Thunderstorms then Mostly Clear | 0 to 5 mph SW | 23% |
| Wednesday | 93°F | Sunny then Chance Showers And Thunderstorms | 0 to 5 mph SW | 33% |
| Wednesday Night | 76°F | Mostly Clear | 0 to 5 mph W | 9% |
| Thursday | 93°F | Sunny then Chance Showers And Thunderstorms | 0 to 5 mph S | 50% |
| Thursday Night | 75°F | Chance Showers And Thunderstorms then Mostly Clear | 0 to 5 mph S | 50% |
| Friday | 92°F | Sunny then Chance Showers And Thunderstorms | 0 to 5 mph E | 38% |
| Friday Night | 75°F | Chance Showers And Thunderstorms | 0 to 5 mph E | 38% |
| Saturday | 92°F | Chance Showers And Thunderstorms | 0 to 5 mph E | 36% |
| Saturday Night | 75°F | Chance Showers And Thunderstorms then Partly Cloudy | 0 to 5 mph SE | 36% |
| Sunday | 91°F | Showers And Thunderstorms Likely | 0 to 5 mph SE | 59% |
| Sunday Night | 75°F | Showers And Thunderstorms Likely | 0 to 5 mph SE | 59% |
| Monday | 91°F | Showers And Thunderstorms Likely | 0 to 5 mph S | 68% |
| Monday Night | 76°F | Showers And Thunderstorms Likely | 0 to 5 mph S | 68% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Mermentau, LA
Last spring frost
Feb 19
First fall frost
Dec 4
Growing season
292 days
Hardiness zone
9a
Explore more for Mermentau, LA: full frost dates · planting calendar · Louisiana frost dates
Climate data from the nearest NOAA station, Jennings, La (4.8 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.