Weather in Mermentau, LA
Updated 2026-08-11 12:45 local time · ZIP codes 70556
Cloudy
No government weather alerts were returned for this location at the latest update.
Next hours
91°3% rain
99°2% rain
97°11% rain94°3% rain93°3% rain93°2% rain89°3% rain
85°4% rain83°7% rain81°9% rain80°10% rain78°14% rain3-day weather forecast
Weather details
Sunrise, sunset and moon
Weather insights for today
Rain chance stays relatively low over the next 12 hours (up to 14%).
It feels like 101°F with winds near 5 mph.
85°F, 4% rain chance and 9 mph wind.
Visibility is around 10 mi; gusts may reach 17 mph.
Current temperature is 91°F, wind 5 mph, rain chance up to 14%.
UV index is 10. Use shade, sunscreen, a hat and sunglasses.
Mermentau weather today
Cloudy and 91°F in Mermentau, LA. Today's high is 99°F with a 9% rain chance. Winds are around 5 mph with gusts near 5 mph. Relative humidity is 59%, pressure is 30.13 inHg, and visibility is about 10 miles.
Tonight and tomorrow in Mermentau
Sunrise is at 06:35 AM and sunset is at 07:55 PM. Tomorrow's forecast calls for Sunny with a high near 95°F and a low near 76°F. The maximum rain chance is 11%.