Mermentau, LA Weather Forecast
Local 7-day forecast
Sunny then Slight Chance Rain Showers
Track current conditions, temperature changes, wind, and the full daily outlook for Mermentau, LA in one place.
A slight chance of rain showers between 3pm and 4pm. Sunny, with a high near 89. Northeast wind 5 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.
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: Oct 9, 2026 1:53 AM CDT.
The active forecast window currently covers Oct 9 to Oct 15, 2026 for Mermentau, LA.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Oct 9 to Oct 15, 2026
- Latest sync
- Oct 9, 2026 1:53 AM CDT
- Forecast office
- LCH
- Source
- NOAA / NWS
Daily Outlook
This Week in Mermentau
Tuesday looks like the warmest upcoming period in Mermentau at 91 degrees F.
Saturday Night is the coolest period ahead with temperatures near 64 degrees F.
The strongest winds are forecast for Friday at about 5 to 15 mph NE.
Precipitation is mentioned in 6 upcoming forecast periods.
Forecast Details
- Last updated
- Oct 9, 2026 1:53 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
Partly cloudy, with a low around 68. Northeast wind around 10 mph. New rainfall amounts less than a tenth of an inch possible.
Mostly sunny, with a high near 84. North wind 10 to 15 mph, with gusts as high as 25 mph.
Mostly clear, with a low around 64. East wind 0 to 5 mph.
Sunny, with a high near 89. Southwest wind 0 to 5 mph.
Mostly clear, with a low around 67. South wind 0 to 5 mph.
Sunny, with a high near 90. Southeast wind 0 to 10 mph.
Mostly clear, with a low around 70. Southeast wind 0 to 5 mph.
A slight chance of rain showers after 1pm. Sunny, with a high near 91. Chance of precipitation is 20%.
A slight chance of rain showers before 7pm. Mostly clear, with a low around 71. Chance of precipitation is 20%.
A slight chance of rain showers after 7am. Sunny, with a high near 91. Chance of precipitation is 20%.
A slight chance of rain showers before 7pm. Mostly clear, with a low around 71. Chance of precipitation is 20%.
Sunny, with a high near 90.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Friday
Oct 9
|
Sunny then Slight Chance Rain Showers
|
89°F |
5 to 15 mph
NE
|
|
Friday Night
Oct 9
|
Partly Cloudy
|
68°F |
10 mph
NE
|
|
Saturday
Oct 10
|
Mostly Sunny
|
84°F |
10 to 15 mph
N
|
|
Saturday Night
Oct 10
|
Mostly Clear
|
64°F |
0 to 5 mph
E
|
|
Sunday
Oct 11
|
Sunny
|
89°F |
0 to 5 mph
SW
|
|
Sunday Night
Oct 11
|
Mostly Clear
|
67°F |
0 to 5 mph
S
|
|
Columbus Day
Oct 12
|
Sunny
|
90°F |
0 to 10 mph
SE
|
|
Monday Night
Oct 12
|
Mostly Clear
|
70°F |
0 to 5 mph
SE
|
|
Tuesday
Oct 13
|
Sunny then Slight Chance Rain Showers
|
91°F |
0 to 10 mph
SE
|
|
Tuesday Night
Oct 13
|
Slight Chance Rain Showers then Mostly Clear
|
71°F |
0 to 10 mph
S
|
|
Wednesday
Oct 14
|
Slight Chance Rain Showers
|
91°F |
0 to 10 mph
SE
|
|
Wednesday Night
Oct 14
|
Slight Chance Rain Showers then Mostly Clear
|
71°F |
0 to 10 mph
S
|
|
Thursday
Oct 15
|
Sunny
|
90°F |
0 to 10 mph
SE
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Mermentau.