Mermentau, LA Weather Forecast
Local 7-day forecast
Chance Showers And Thunderstorms
Track current conditions, temperature changes, wind, and the full daily outlook for Mermentau, LA in one place.
A slight chance of showers and thunderstorms before 7am, then a chance of showers and thunderstorms between 7am and 10am, then a chance of showers and thunderstorms between 10am and 1pm, then showers and thunderstorms likely. Mostly sunny, with a high near 80. Southeast wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 60%.
Local Weather Overview
This forecast page for Mermentau, LA is designed for quick trip planning, giving you a clean read on daytime highs, overnight lows, and changing conditions across the upcoming forecast window. Latest sync: Apr 22, 2026 3:31 AM CDT.
The active forecast window currently covers Apr 23 to Apr 28, 2026 for Mermentau, LA.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Apr 23 to Apr 28, 2026
- Latest sync
- Apr 22, 2026 3:31 AM CDT
- Forecast office
- LCH
- Source
- NOAA / NWS
Daily Outlook
This Week in Mermentau
Tuesday looks like the warmest upcoming period in Mermentau at 88 degrees F.
Thursday Night is the coolest period ahead with temperatures near 69 degrees F.
The strongest winds are forecast for Monday at about 5 to 15 mph S.
Precipitation is mentioned in 5 upcoming forecast periods.
Forecast Details
- Last updated
- Apr 22, 2026 3:31 AM CDT
- Coverage
- 6 days
- Time zone
- America/Chicago
- Forecast office
- LCH
- Radar station
- KLCH
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
Showers and thunderstorms likely before 7pm. Mostly cloudy, with a low around 69. Southeast wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 60%.
Partly sunny, with a high near 83. South wind 5 to 10 mph, with gusts as high as 20 mph.
A slight chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 71. South wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 20%.
A chance of showers and thunderstorms. Partly sunny, with a high near 84. South wind 5 to 10 mph. Chance of precipitation is 30%.
A chance of showers and thunderstorms before 7pm. Partly cloudy, with a low around 70. South wind 5 to 10 mph. Chance of precipitation is 30%.
Partly sunny, with a high near 85.
Partly cloudy, with a low around 73.
Partly sunny, with a high near 87.
Partly cloudy, with a low around 72.
Partly sunny, with a high near 88.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Thursday
Apr 23
|
Chance Showers And Thunderstorms
|
80°F |
5 to 10 mph
SE
|
|
Thursday Night
Apr 23
|
Showers And Thunderstorms Likely then Mostly Cloudy
|
69°F |
5 to 10 mph
SE
|
|
Friday
Apr 24
|
Partly Sunny
|
83°F |
5 to 10 mph
S
|
|
Friday Night
Apr 24
|
Partly Cloudy then Slight Chance Showers And Thunderstorms
|
71°F |
5 to 10 mph
S
|
|
Saturday
Apr 25
|
Chance Showers And Thunderstorms
|
84°F |
5 to 10 mph
S
|
|
Saturday Night
Apr 25
|
Chance Showers And Thunderstorms then Partly Cloudy
|
70°F |
5 to 10 mph
S
|
|
Sunday
Apr 26
|
Partly Sunny
|
85°F |
5 to 10 mph
S
|
|
Sunday Night
Apr 26
|
Partly Cloudy
|
73°F |
5 to 10 mph
S
|
|
Monday
Apr 27
|
Partly Sunny
|
87°F |
5 to 15 mph
S
|
|
Monday Night
Apr 27
|
Partly Cloudy
|
72°F |
5 to 15 mph
S
|
|
Tuesday
Apr 28
|
Partly Sunny
|
88°F |
5 to 10 mph
S
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Mermentau.