Mermentau, LA Weather & Growing Conditions
Today
73°F
Mostly Sunny
Mostly sunny, with a high near 73. North wind 0 to 10 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 73°F | Mostly Sunny | 0 to 10 mph N | 1% |
| Tonight | 53°F | Clear | 0 mph | 0% |
| Thursday | 76°F | Sunny | 0 mph | 0% |
| Thursday Night | 57°F | Partly Cloudy | 0 mph | 7% |
| Friday | 77°F | Sunny | 0 to 5 mph NE | 2% |
| Friday Night | 55°F | Partly Cloudy | 5 to 10 mph NE | 2% |
| Saturday | 71°F | Mostly Sunny | 10 mph NE | 0% |
| Saturday Night | 49°F | Partly Cloudy | 5 to 10 mph NE | 4% |
| Sunday | 65°F | Slight Chance Rain Showers then Mostly Sunny | 5 to 10 mph N | 15% |
| Sunday Night | 45°F | Partly Cloudy | 5 mph N | 5% |
| Monday | 67°F | Sunny | 5 mph N | 4% |
| Monday Night | 45°F | Mostly Clear | 0 mph | 1% |
| Tuesday | 71°F | Sunny | 0 to 5 mph N | 3% |
| Tuesday Night | 48°F | Partly Cloudy | 0 mph | 2% |
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 Nov 4, 2026.