Mermentau, Louisiana 7 Day & Night Forecast & Conditions

Current Conditions

Maps Alerts Climate Index

Mostly Clear 87°F 31°C Heat Index: 99°F	Observed at: Mermentau, LA	Elevation: 67 ft | 20 m
	Last Updated: July 27, 7:00 PM Timezone: GMT -5/-4
	Sky Conditions: Mostly Clear	Temperature: 87°F | 31°C
	Pressure: 29.87 in | 1011.4 mb	Dewpoint: 77°F | 25°C
	Humidity: 72%	Wind: SW 8 mph | SW 13 kph
	Feels Like: 96°F | 36°C	Visibility: 46.7 mi | 75.1 km
	Lat/Long: 30.13 | -92.62	Sunrise: 6:26 AM   Sunset: 8:07 PM

7 Day Graphical Forecast

Valid: 1:18 PM 7/28/2026

Today Partly Cloudy 91 |78 °F 33 |25 °C 2% Chance Precipitation Tuesday Overcast 93 |76 °F 34 |25 °C 3% Chance Precipitation Wednesday Overcast 94 |77 °F 35 |25 °C 5% Chance Precipitation Thursday Overcast 95 |76 °F 35 |25 °C 23% Chance Precipitation Friday Overcast 95 |77 °F 35 |25 °C 24% Chance Precipitation Saturday Light Showers 94 |80 °F 35 |27 °C 27% Chance Precipitation Sunday Thunderstorm 88 |72 °F 31 |22 °C 39% Chance Precipitation

7 Hour Graphical Forecast

Valid: 1:18 PM 7/28/2026

1 PM Clear 90 °F 2% Chance Precipitation

2 PM Clear 91 °F 3% Chance Precipitation

3 PM Clear 92 °F 3% Chance Precipitation

4 PM Clear 93 °F 3% Chance Precipitation

5 PM Overcast 92 °F 2% Chance Precipitation

6 PM Mostly Clear 89 °F 2% Chance Precipitation

7 PM Clear 86 °F 2% Chance Precipitation

7 Day Textual Forecast - with QPF, Max Wind, Humidity, Snowfall & UV Index

7 Day & Night Weather Forecast for Mermentau, LA - (Fahrenheit & Celsius) Valid: 1:18 PM 7/28/2026 Today Partly Cloudy with a high near 91°F [33°C]. SW wind to around 8 mph [13 kph], with gusts to near 17 mph [27 kph]. Dewpoint near 77°F [25°C] with humidity of 94%. Pressure around 29.87 in [1011.4 mb]. UV Index: 8.45. Chance of precipitation 2% with QPF of 0.00 in [0.0 mm]. Tonight Partly Cloudy with a low around 78°F [25°C]. SW wind to around 8 mph [13 kph], with gusts to near 17 mph [27 kph]. Chance of precipitation 2% with QPF of 0.00 in [0.0 mm]. Tuesday Overcast with a high near 93°F [34°C]. WSW wind to around 11 mph [18 kph], with gusts to near 20 mph [32 kph]. Dewpoint near 77°F [25°C] with humidity of 94%. Pressure around 29.87 in [1011.4 mb]. UV Index: 8.55. Chance of precipitation 3% with QPF of 0.00 in [0.0 mm]. Tuesday Night Overcast with a low around 76°F [25°C]. WSW wind to around 11 mph [18 kph], with gusts to near 20 mph [32 kph]. Chance of precipitation 3% with QPF of 0.00 in [0.0 mm]. Wednesday Overcast with a high near 94°F [35°C]. WSW wind to around 11 mph [18 kph], with gusts to near 20 mph [32 kph]. Dewpoint near 77°F [25°C] with humidity of 93%. Pressure around 29.87 in [1011.4 mb]. UV Index: 8.35. Chance of precipitation 5% with QPF of 0.00 in [0.0 mm]. Wednesday Night Overcast with a low around 77°F [25°C]. WSW wind to around 11 mph [18 kph], with gusts to near 20 mph [32 kph]. Chance of precipitation 5% with QPF of 0.00 in [0.0 mm]. Thursday Overcast with a high near 95°F [35°C]. WSW wind to around 13 mph [21 kph], with gusts to near 20 mph [32 kph]. Dewpoint near 77°F [25°C] with humidity of 88%. Pressure around 29.87 in [1011.4 mb]. UV Index: 8.55. Chance of precipitation 23% with QPF of 0.00 in [0.0 mm]. Thursday Night Overcast with a low around 76°F [25°C]. WSW wind to around 13 mph [21 kph], with gusts to near 20 mph [32 kph]. Chance of precipitation 23% with QPF of 0.00 in [0.0 mm]. Friday Overcast with a high near 95°F [35°C]. SW wind to around 14 mph [23 kph], with gusts to near 26 mph [41 kph]. Dewpoint near 77°F [25°C] with humidity of 86%. Pressure around 29.87 in [1011.4 mb]. UV Index: 8.4. Chance of precipitation 24% with QPF of 0.00 in [0.0 mm]. Friday Night Overcast with a low around 77°F [25°C]. SW wind to around 14 mph [23 kph], with gusts to near 26 mph [41 kph]. Chance of precipitation 24% with QPF of 0.00 in [0.0 mm]. Saturday Light Showers with a high near 94°F [35°C]. SW wind to around 19 mph [31 kph], with gusts to near 31 mph [50 kph]. Dewpoint near 77°F [25°C] with humidity of 83%. Pressure around 29.87 in [1011.4 mb]. UV Index: 7.75. Chance of precipitation 27% with QPF of 0.05 in [1.3 mm]. Saturday Night Light Showers with a low around 80°F [27°C]. SW wind to around 19 mph [31 kph], with gusts to near 31 mph [50 kph]. Chance of precipitation 27% with QPF of 0.05 in [1.3 mm]. Sunday Thunderstorm with a high near 88°F [31°C]. N wind to around 8 mph [13 kph], with gusts to near 24 mph [39 kph]. Dewpoint near 77°F [25°C] with humidity of 94%. Pressure around 29.87 in [1011.4 mb]. UV Index: 7.25. Chance of precipitation 39% with QPF of 0.89 in [22.7 mm]. Sunday Night Thunderstorm with a low around 72°F [22°C]. N wind to around 8 mph [13 kph], with gusts to near 24 mph [39 kph]. Chance of precipitation 39% with QPF of 0.89 in [22.7 mm].

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7 Day and Night - QPF Forecast for Mermentau, LA

Today: 0.0 mm | 0.00 in

Tonight: 0.0 mm | 0.00 in

Tuesday: 0.0 mm | 0.00 in

Tuesday Night: 0.0 mm | 0.00 in

Wednesday: 0.0 mm | 0.00 in

Wednesday Night: 0.0 mm | 0.00 in

Thursday: 0.0 mm | 0.00 in

Thursday Night: 0.0 mm | 0.00 in

Friday: 0.0 mm | 0.00 in

Friday Night: 0.0 mm | 0.00 in

Saturday: 1.3 mm | 0.05 in

Saturday Night: 1.3 mm | 0.05 in

Sunday: 22.7 mm | 0.89 in

Sunday Night: 22.7 mm | 0.89 in

7 Day and Night - Maximum Wind Speed Forecast for Mermentau, LA

Today: SW @ 13 kph | 8 mph

Tonight: SW @ 13 kph | 8 mph

Tuesday: WSW @ 18 kph | 11 mph

Tuesday Night: WSW @ 18 kph | 11 mph

Wednesday: WSW @ 18 kph | 11 mph

Wednesday Night: WSW @ 18 kph | 11 mph

Thursday: WSW @ 21 kph | 13 mph

Thursday Night: WSW @ 21 kph | 13 mph

Friday: SW @ 23 kph | 14 mph

Friday Night: SW @ 23 kph | 14 mph

Saturday: SW @ 31 kph | 19 mph

Saturday Night: SW @ 31 kph | 19 mph

Sunday: N @ 13 kph | 8 mph

Sunday Night: N @ 13 kph | 8 mph

7 Day and Night - Maximum Humidity Forecast for Mermentau, LA

Today: 94 %

Tonight: 94 %

Tuesday: 94 %

Tuesday Night: 94 %

Wednesday: 93 %

Wednesday Night: 93 %

Thursday: 88 %

Thursday Night: 88 %

Friday: 86 %

Friday Night: 86 %

Saturday: 83 %

Saturday Night: 83 %

Sunday: 94 %

Sunday Night: 94 %

7 Day and Night - Snowfall Totals Forecast for Mermentau, LA

Today: 0.0 cm | 0.00 in

Tonight: 0.0 cm | 0.00 in

Tuesday: 0.0 cm | 0.00 in

Tuesday Night: 0.0 cm | 0.00 in

Wednesday: 0.0 cm | 0.00 in

Wednesday Night: 0.0 cm | 0.00 in

Thursday: 0.0 cm | 0.00 in

Thursday Night: 0.0 cm | 0.00 in

Friday: 0.0 cm | 0.00 in

Friday Night: 0.0 cm | 0.00 in

Saturday: 0.0 cm | 0.00 in

Saturday Night: 0.0 cm | 0.00 in

Sunday: 0.0 cm | 0.00 in

Sunday Night: 0.0 cm | 0.00 in

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