Mermentau, LA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Mermentau, a village in Acadia County, Louisiana.
Tonight
74°F
Clear
Clear, with a low around 74. Heat index values as high as 99. South wind 0 to 5 mph.
7-day forecast for Mermentau
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 74°F | Clear | 0 to 5 mph S | 0% |
| Sunday | 95°F | Sunny | 0 to 5 mph E | 4% |
| Sunday Night | 75°F | Mostly Clear | 0 to 5 mph SW | 3% |
| Monday | 96°F | Sunny then Slight Chance Showers And Thunderstorms | 0 to 5 mph NE | 21% |
| Monday Night | 76°F | Slight Chance Showers And Thunderstorms then Mostly Clear | 0 mph | 21% |
| Tuesday | 97°F | Sunny then Slight Chance Showers And Thunderstorms | 0 to 5 mph NE | 16% |
| Tuesday Night | 76°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 0 to 5 mph E | 16% |
| Wednesday | 96°F | Sunny | 0 to 10 mph NE | 9% |
| Wednesday Night | 75°F | Mostly Clear | 0 to 5 mph NE | 9% |
| Thursday | 94°F | Sunny | 5 to 10 mph NE | 3% |
| Thursday Night | 72°F | Mostly Clear | 5 mph NE | 3% |
| Friday | 93°F | Sunny | 5 to 10 mph NE | 2% |
| Friday Night | 72°F | Mostly Clear | 5 mph NE | 2% |
| Saturday | 93°F | Sunny | 5 mph NE | 5% |
Forecast source: National Weather Service (api.weather.gov) for Mermentau (30.188, -92.584). Updated through the day.
Growing snapshot for Mermentau
Last spring frost
Feb 19
First fall frost
Dec 4
Growing season
292 days
Hardiness zone
9a
More local growing data for Mermentau: nearby ZIP 70556 weather · frost dates · planting calendar · Louisiana frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Jennings, La (4.8 mi from Mermentau). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 20, 2026.