Mermentau, LA Weather Forecast

Local 7-day forecast

87°
F

Slight Chance Showers And Thunderstorms

Track current conditions, temperature changes, wind, and the full daily outlook for Mermentau, LA in one place.

Wednesday, July 15, 2026
Wind: 0 to 5 mph SE
Today

A slight chance of showers and thunderstorms between 9am and 3pm, then a chance of showers and thunderstorms. Partly sunny, with a high near 87. Southeast wind 0 to 5 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.

Local 7-day forecast

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 15, 2026 10:03 AM CDT.

The active forecast window currently covers Jul 15 to Jul 21, 2026 for Mermentau, LA.

Page Snapshot

Page focus
city weather
Forecast window
Jul 15 to Jul 21, 2026
Latest sync
Jul 15, 2026 10:03 AM CDT
Forecast office
LCH
Source
NOAA / NWS
Next High
87°F
Today
Next Low
74°F
Tonight
Rain Outlook
2
Periods mentioning precipitation
Windiest
0 to 5 mph
Today

Daily Outlook

Today
Jul 15
Slight Chance Showers And Thunderstorms
87 °F
/ 74°F
Wind 0 to 5 mph
Thu
Jul 16
Mostly Sunny
90 °F
/ 75°F
Wind 0 to 5 mph
Fri
Jul 17
Sunny
92 °F
/ 76°F
Wind 0 to 5 mph
Sat
Jul 18
Mostly Sunny
92 °F
/ 76°F
Wind 0 to 5 mph
Sun
Jul 19
Sunny
92 °F
/ 76°F
Wind 0 to 5 mph
Mon
Jul 20
Sunny
93 °F
/ 77°F
Wind 5 mph
Tue
Jul 21
Sunny
93 °F
/ 77°F
Wind 5 mph

This Week in Mermentau

Monday looks like the warmest upcoming period in Mermentau at 93 degrees F.

Tonight is the coolest period ahead with temperatures near 74 degrees F.

The strongest winds are forecast for Today at about 0 to 5 mph SE.

Precipitation is mentioned in 2 upcoming forecast periods.

Forecast Details

Last updated
Jul 15, 2026 10:03 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 source

Extended Forecast

Tonight
Jul 15
74°F
Slight Chance Rain Showers then Partly Cloudy
0 to 5 mph SE

A slight chance of rain showers before 7pm. Partly cloudy, with a low around 74. Southeast wind 0 to 5 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.

Thursday
Jul 16
90°F
Mostly Sunny
0 to 5 mph SE

Mostly sunny, with a high near 90. Heat index values as high as 102. Southeast wind 0 to 5 mph.

Thursday Night
Jul 16
75°F
Mostly Clear
0 to 5 mph S

Mostly clear, with a low around 75. Heat index values as high as 100. South wind 0 to 5 mph.

Friday
Jul 17
92°F
Sunny
0 to 5 mph S

Sunny, with a high near 92. South wind 0 to 5 mph.

Friday Night
Jul 17
76°F
Partly Cloudy
0 to 5 mph SW

Partly cloudy, with a low around 76. Southwest wind 0 to 5 mph.

Saturday
Jul 18
92°F
Mostly Sunny
0 to 5 mph W

Mostly sunny, with a high near 92. West wind 0 to 5 mph.

Saturday Night
Jul 18
76°F
Mostly Clear
5 mph SW

Mostly clear, with a low around 76. Southwest wind around 5 mph.

Sunday
Jul 19
92°F
Sunny
0 to 5 mph W

Sunny, with a high near 92. West wind 0 to 5 mph.

Sunday Night
Jul 19
76°F
Mostly Clear
5 mph SW

Mostly clear, with a low around 76.

Monday
Jul 20
93°F
Sunny
5 mph W

Sunny, with a high near 93.

Monday Night
Jul 20
77°F
Mostly Clear
5 mph SW

Mostly clear, with a low around 77.

Tuesday
Jul 21
93°F
Sunny
5 mph W

Sunny, with a high near 93.

Tuesday Night
Jul 21
77°F
Mostly Clear
5 mph SW

Mostly clear, with a low around 77.

Detailed Forecast

Period Conditions Temp Wind
Today
Jul 15
Slight Chance Showers And Thunderstorms
87°F
0 to 5 mph
SE
Tonight
Jul 15
Slight Chance Rain Showers then Partly Cloudy
74°F
0 to 5 mph
SE
Thursday
Jul 16
Mostly Sunny
90°F
0 to 5 mph
SE
Thursday Night
Jul 16
Mostly Clear
75°F
0 to 5 mph
S
Friday
Jul 17
Sunny
92°F
0 to 5 mph
S
Friday Night
Jul 17
Partly Cloudy
76°F
0 to 5 mph
SW
Saturday
Jul 18
Mostly Sunny
92°F
0 to 5 mph
W
Saturday Night
Jul 18
Mostly Clear
76°F
5 mph
SW
Sunday
Jul 19
Sunny
92°F
0 to 5 mph
W
Sunday Night
Jul 19
Mostly Clear
76°F
5 mph
SW
Monday
Jul 20
Sunny
93°F
5 mph
W
Monday Night
Jul 20
Mostly Clear
77°F
5 mph
SW
Tuesday
Jul 21
Sunny
93°F
5 mph
W
Tuesday Night
Jul 21
Mostly Clear
77°F
5 mph
SW
Weather data provided by the National Weather Service (NOAA). Forecast pages update automatically as new periods are synced for each supported U.S. location.