National Weather Service Forecast for: Port Allen LA
Issued by: National Weather Service New Orleans/Baton Rouge, LA
Updated: 3:31 pm CST Dec 17, 2025
 
Tonight

Tonight: A 40 percent chance of showers, mainly after 1am. Patchy fog after 9pm. Otherwise, cloudy, with a low around 58. Southeast wind around 5 mph.
Chance
Showers and
Patchy Fog
 Thursday

Thursday: A chance of showers before 3pm, then a slight chance of showers and thunderstorms between 3pm and 5pm. Areas of fog before 11am. Otherwise, partly sunny, with a high near 76. Southeast wind 5 to 10 mph becoming west in the afternoon. Chance of precipitation is 40%.
Chance
Showers and
Areas Fog
 Thursday
Night
Thursday Night: A 20 percent chance of showers before midnight. Mostly clear, with a low around 47. West wind 5 to 10 mph becoming north after midnight.
Slight Chance
Showers then
Mostly Clear
 Friday

Friday: Sunny, with a high near 62. North wind around 5 mph.
Sunny

 Friday
Night
Friday Night: Mostly clear, with a low around 45. Calm wind becoming east around 5 mph.
Mostly Clear

 Saturday

Saturday: Sunny, with a high near 74. South wind 5 to 10 mph.
Sunny

 Saturday
Night
Saturday Night: Partly cloudy, with a low around 59. South wind around 5 mph.
Partly Cloudy

 Sunday

Sunday: A 20 percent chance of showers and thunderstorms after noon. Partly sunny, with a high near 75. South wind around 5 mph.
Partly Sunny
then Slight
Chance
T-storms
 Sunday
Night
Sunday Night: Mostly cloudy, with a low around 59. Southeast wind around 5 mph.
Mostly Cloudy
Lo 58 °F Hi 76 °F Lo 47 °F Hi 62 °F Lo 45 °F Hi 74 °F Lo 59 °F Hi 75 °F Lo 59 °F

Dense Fog Advisory
 

Tonight
 
 A 40 percent chance of showers, mainly after 1am. Patchy fog after 9pm. Otherwise, cloudy, with a low around 58. Southeast wind around 5 mph.
Thursday
 
 A chance of showers before 3pm, then a slight chance of showers and thunderstorms between 3pm and 5pm. Areas of fog before 11am. Otherwise, partly sunny, with a high near 76. Southeast wind 5 to 10 mph becoming west in the afternoon. Chance of precipitation is 40%.
Thursday Night
 
 A 20 percent chance of showers before midnight. Mostly clear, with a low around 47. West wind 5 to 10 mph becoming north after midnight.
Friday
 
 Sunny, with a high near 62. North wind around 5 mph.
Friday Night
 
 Mostly clear, with a low around 45. Calm wind becoming east around 5 mph.
Saturday
 
 Sunny, with a high near 74. South wind 5 to 10 mph.
Saturday Night
 
 Partly cloudy, with a low around 59. South wind around 5 mph.
Sunday
 
 A 20 percent chance of showers and thunderstorms after noon. Partly sunny, with a high near 75. South wind around 5 mph.
Sunday Night
 
 Mostly cloudy, with a low around 59. Southeast wind around 5 mph.
Monday
 
 Mostly sunny, with a high near 73. Southeast wind around 5 mph.
Monday Night
 
 Partly cloudy, with a low around 57. Southeast wind around 5 mph becoming calm.
Tuesday
 
 Sunny, with a high near 76. Calm wind becoming southeast around 5 mph.
Tuesday Night
 
 Partly cloudy, with a low around 57. Southeast wind around 5 mph becoming calm.
Wednesday
 
 Mostly sunny, with a high near 74. Calm wind becoming southeast around 5 mph.

 

Forecast from NOAA-NWS for Port Allen LA.