Weather in Mermentau, LA
Updated 2026-09-26 09:00 local time · ZIP codes 70556
Partly Cloudy
No government weather alerts were returned for this location at the latest update.
Next hours
78°7% rain
81°13% rain84°11% rain87°10% rain88°10% rain89°10% rain90°10% rain90°10% rain89°10% rain87°10% rain81°12% rain
77°15% rain3-day weather forecast
Weather details
Sunrise, sunset and moon
Key weather changes ahead
Weather insights for today
Rain chance stays relatively low over the next 12 hours (up to 15%).
It feels like 80°F with winds near 8 mph.
78°F, 7% rain chance and 8 mph wind.
Visibility is around 6 mi; gusts may reach 17 mph.
Current temperature is 78°F, wind 8 mph, rain chance up to 15%.
UV index is 1.
Local weather characteristics in Mermentau
Louisiana is warm, humid and rainy, with hot summers, mild winters, frequent thunderstorms and exposure to tropical storms and hurricanes near the Gulf Coast.
Mermentau is part of the South weather region. The forecast point is near 30.19°N latitude and 92.58°W longitude. Local temperature, wind and precipitation can still differ from nearby places, especially where terrain, coastlines or urban development create small-scale weather changes.
Mermentau weather today
Partly Cloudy and 78°F in Mermentau, LA. Today's high is 90°F with a 14% rain chance. Winds are around 8 mph with gusts near 11 mph. Relative humidity is 64%, pressure is 30.03 inHg, and visibility is about 6 miles.
Tonight and tomorrow in Mermentau
Sunrise is at 07:00 AM and sunset is at 07:02 PM. Tomorrow's forecast calls for Sunny with a high near 94°F and a low near 70°F. The maximum rain chance is 6%.