Mermentau, LA Weather Forecast
Local 7-day forecast
Mostly Clear
Track current conditions, temperature changes, wind, and the full daily outlook for Mermentau, LA in one place.
Mostly clear, with a low around 77. West wind around 5 mph.
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: Jul 28, 2026 2:14 AM CDT.
The active forecast window currently covers Jul 28 to Aug 3, 2026 for Mermentau, LA.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Jul 28 to Aug 3, 2026
- Latest sync
- Jul 28, 2026 2:14 AM CDT
- Forecast office
- LCH
- Source
- NOAA / NWS
Daily Outlook
This Week in Mermentau
Wednesday looks like the warmest upcoming period in Mermentau at 95 degrees F.
Overnight is the coolest period ahead with temperatures near 77 degrees F.
The strongest winds are forecast for Saturday Night at about 10 to 15 mph SW.
Precipitation is mentioned in 9 upcoming forecast periods.
Forecast Details
- Last updated
- Jul 28, 2026 2:14 AM CDT
- Coverage
- 7 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
Sunny, with a high near 94. Heat index values as high as 106. West wind 5 to 10 mph.
Mostly clear, with a low around 78. Heat index values as high as 103. Southwest wind 5 to 10 mph.
Mostly sunny, with a high near 95. Heat index values as high as 106. West wind around 5 mph.
Partly cloudy, with a low around 79. Southwest wind around 5 mph.
A chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 94. West wind around 5 mph. Chance of precipitation is 30%.
A chance of showers and thunderstorms before 7pm. Partly cloudy, with a low around 79. Southwest wind around 5 mph. Chance of precipitation is 30%.
A chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 93. Southwest wind around 5 mph. Chance of precipitation is 30%.
A chance of showers and thunderstorms before 7pm. Partly cloudy, with a low around 80. Southwest wind 5 to 10 mph. Chance of precipitation is 30%.
A chance of showers and thunderstorms after 7am. Partly sunny, with a high near 91. Chance of precipitation is 40%.
A chance of showers and thunderstorms. Partly cloudy, with a low around 79. Chance of precipitation is 50%.
A chance of showers and thunderstorms. Mostly sunny, with a high near 90. Chance of precipitation is 50%.
A chance of showers and thunderstorms before 1am, then a chance of showers and thunderstorms. Partly cloudy, with a low around 77. Chance of precipitation is 50%.
A chance of showers and thunderstorms before 7am, then a chance of showers and thunderstorms. Mostly sunny, with a high near 91.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Overnight
Jul 28
|
Mostly Clear
|
77°F |
5 mph
W
|
|
Tuesday
Jul 28
|
Sunny
|
94°F |
5 to 10 mph
W
|
|
Tuesday Night
Jul 28
|
Mostly Clear
|
78°F |
5 to 10 mph
SW
|
|
Wednesday
Jul 29
|
Mostly Sunny
|
95°F |
5 mph
W
|
|
Wednesday Night
Jul 29
|
Partly Cloudy
|
79°F |
5 mph
SW
|
|
Thursday
Jul 30
|
Mostly Sunny then Chance Showers And Thunderstorms
|
94°F |
5 mph
W
|
|
Thursday Night
Jul 30
|
Chance Showers And Thunderstorms then Partly Cloudy
|
79°F |
5 mph
SW
|
|
Friday
Jul 31
|
Mostly Sunny then Chance Showers And Thunderstorms
|
93°F |
5 mph
SW
|
|
Friday Night
Jul 31
|
Chance Showers And Thunderstorms then Partly Cloudy
|
80°F |
5 to 10 mph
SW
|
|
Saturday
Aug 1
|
Chance Showers And Thunderstorms
|
91°F |
5 to 10 mph
SW
|
|
Saturday Night
Aug 1
|
Chance Showers And Thunderstorms
|
79°F |
10 to 15 mph
SW
|
|
Sunday
Aug 2
|
Chance Showers And Thunderstorms
|
90°F |
10 mph
SW
|
|
Sunday Night
Aug 2
|
Chance Showers And Thunderstorms
|
77°F |
0 to 10 mph
SW
|
|
Monday
Aug 3
|
Chance Showers And Thunderstorms
|
91°F |
0 to 5 mph
SW
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Mermentau.