National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Heavy Rainfall Continues from the Southwest to the Plains; Severe Thunderstorms in the Southern Plains

Pacific tropical moisture wrapping into a storm will continue a multi-day heavy rainfall event this week that will impact the Southwest into the Plains. Scattered severe thunderstorms capable of mainly severe wind gusts appear possible across portions of the southern Plains this afternoon into tonight. There is also a risk of isolated severe winds gusts and tornadoes in Kansas into Nebraska. Read More >

Current conditions at

Lafayette, Lafayette Regional Airport (KLFT)

Lat: 30.2°NLon: 91.99°WElev: 39ft.

Mostly Cloudy

91°F

33°C

Humidity 56%
Wind Speed Vrbl 6 mph
Barometer 29.91 in (1012.8 mb)
Dewpoint 73°F (23°C)
Visibility 10.00 mi
Heat Index100°F (38°C)
Last update 30 Sep 1:53 pm CDT
Extended Forecast for

Mermentau LA

  • This Afternoon

    This Afternoon: Mostly sunny, with a high near 91. Heat index values as high as 100. Southeast wind around 10 mph.

    High: 91 °F

    Mostly Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 74. Southeast wind 5 to 10 mph.

    Low: 74 °F

    Mostly Clear

  • Thursday

    Thursday: A chance of showers, with thunderstorms also possible after 1pm. Mostly sunny, with a high near 90. Heat index values as high as 102. South wind 5 to 10 mph. Chance of precipitation is 40%.

    High: 90 °F

    Chance
    Showers then
    Chance
    T-storms

  • Thursday Night

    Thursday Night: A slight chance of thunderstorms before 11pm, then a slight chance of showers between 11pm and midnight. Mostly clear, with a low around 74. East wind 5 to 10 mph. Chance of precipitation is 20%.

    Low: 74 °F

    Slight Chance
    T-storms then
    Partly Cloudy

  • Friday

    Friday: A chance of showers, then showers and possibly a thunderstorm after 1pm. High near 90. East wind around 5 mph. Chance of precipitation is 90%.

    High: 90 °F

    Chance
    Showers then
    Showers

  • Friday Night

    Friday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 72. East wind around 5 mph becoming calm. Chance of precipitation is 30%.

    Low: 72 °F

    Chance
    Showers

  • Saturday

    Saturday: A chance of showers before 10am, then a chance of showers and thunderstorms between 10am and 1pm, then showers and possibly a thunderstorm after 1pm. High near 86. Northeast wind around 5 mph. Chance of precipitation is 90%.

    High: 86 °F

    Chance
    Showers then
    Showers

  • Saturday Night

    Saturday Night: Showers likely and possibly a thunderstorm before 1am, then a chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 71. Northeast wind around 5 mph. Chance of precipitation is 60%.

    Low: 71 °F

    Showers
    Likely

  • Sunday

    Sunday: A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 1pm. High near 82. Northeast wind around 5 mph. Chance of precipitation is 80%.

    High: 82 °F

    Chance
    Showers then
    Showers

Detailed Forecast

This Afternoon
Mostly sunny, with a high near 91. Heat index values as high as 100. Southeast wind around 10 mph.
Tonight
Mostly clear, with a low around 74. Southeast wind 5 to 10 mph.
Thursday
A chance of showers, with thunderstorms also possible after 1pm. Mostly sunny, with a high near 90. Heat index values as high as 102. South wind 5 to 10 mph. Chance of precipitation is 40%.
Thursday Night
A slight chance of thunderstorms before 11pm, then a slight chance of showers between 11pm and midnight. Mostly clear, with a low around 74. East wind 5 to 10 mph. Chance of precipitation is 20%.
Friday
A chance of showers, then showers and possibly a thunderstorm after 1pm. High near 90. East wind around 5 mph. Chance of precipitation is 90%.
Friday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 72. East wind around 5 mph becoming calm. Chance of precipitation is 30%.
Saturday
A chance of showers before 10am, then a chance of showers and thunderstorms between 10am and 1pm, then showers and possibly a thunderstorm after 1pm. High near 86. Northeast wind around 5 mph. Chance of precipitation is 90%.
Saturday Night
Showers likely and possibly a thunderstorm before 1am, then a chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 71. Northeast wind around 5 mph. Chance of precipitation is 60%.
Sunday
A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 1pm. High near 82. Northeast wind around 5 mph. Chance of precipitation is 80%.
Sunday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 70. Chance of precipitation is 40%.
Monday
A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 82.
Monday Night
Mostly cloudy, with a low around 67.
Tuesday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 82.
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ABOUT THIS FORECAST

 
Point Forecast:
Mermentau LA
 30.18°N 92.58°W
Last Update:
2:45 pm CDT Sep 30, 2026
Forecast Valid:
2pm CDT Sep 30, 2026-6pm CDT Oct 6, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation