Mermentau, LA Weather & Growing Conditions
Today
94°F
Sunny
Sunny, with a high near 94. Heat index values as high as 100. Northeast wind 0 to 5 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 94°F | Sunny | 0 to 5 mph NE | 1% |
| Tonight | 73°F | Clear | 0 to 5 mph S | 1% |
| Sunday | 94°F | Sunny | 0 to 5 mph E | 5% |
| Sunday Night | 75°F | Mostly Clear | 0 to 5 mph SW | 0% |
| Monday | 95°F | Sunny then Slight Chance Showers And Thunderstorms | 0 to 5 mph NE | 20% |
| Monday Night | 75°F | Slight Chance Showers And Thunderstorms then Mostly Clear | 0 mph | 20% |
| Tuesday | 96°F | Sunny then Slight Chance Showers And Thunderstorms | 0 to 5 mph N | 19% |
| Tuesday Night | 75°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 0 mph | 19% |
| Wednesday | 95°F | Sunny | 0 to 10 mph NE | 6% |
| Wednesday Night | 73°F | Mostly Clear | 5 mph NE | 6% |
| Thursday | 93°F | Sunny | 5 to 10 mph NE | 2% |
| Thursday Night | 71°F | Mostly Clear | 5 mph NE | 2% |
| Friday | 92°F | Mostly Sunny | 5 to 10 mph NE | 3% |
| Friday Night | 71°F | Partly Cloudy | 5 mph NE | 3% |
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 Sep 19, 2026.