Weather WorldGrand Lake, LA 7-Day Night Weather Forecast
Quick Weather Clicks
Settings
Sun & Moon
Weather Quote O' the Day
Grand Lake, LA Weather Forecast
Grand Lake, LA Weather Forecast Date: 306 PM CDT Sat Aug 08 2026
The area/counties/county of: Lower St. Martin, including the city of Stephensville.or toggle through each period.
Tonight... Partly cloudy this evening, then clearing. Lows in the mid 70s. South winds around 5 mph this evening, becoming light and variable.
Sunday... Mostly sunny. A slight chance of showers and thunderstorms in the morning, then a chance of showers and thunderstorms in the afternoon. Humid with highs in the lower 90s. Southeast winds around 5 mph. Chance of rain 50%. Heat index values up to 107.
Sunday Night... Partly cloudy in the evening, then mostly clear with a chance of showers after midnight. Humid with lows in the mid 70s. South winds around 5 mph in the evening, becoming light and variable. Chance of rain 30%.
Monday... Mostly sunny. A chance of showers and thunderstorms in the morning, then showers with thunderstorms likely in the afternoon. Humid with highs around 90. South winds around 5 mph. Chance of rain 80%. Heat index values up to 107.
Monday Night... Partly cloudy in the evening, then becoming mostly clear. Humid with lows in the mid 70s. South winds around 5 mph in the evening, becoming light and variable.
Tuesday... Mostly sunny. A chance of showers and thunderstorms in the afternoon. Highs in the lower 90s. Chance of rain 50%. Heat index values up to 110.
Tuesday Night... Partly cloudy in the evening, then clearing. Lows in the upper 70s.
Wednesday... Sunny. A chance of showers and thunderstorms in the afternoon. Highs in the lower 90s. Chance of rain 30%. Heat index values up to 110.
Wednesday Night... Mostly clear. Lows in the upper 70s. Highs in the mid 90s. Heat index values up to 110.
Thursday... Mostly clear. Lows in the upper 70s. Highs in the mid 90s. Heat index values up to 110.
Friday... Mostly clear. Lows in the upper 70s. Highs in the mid 90s. Heat index values up to 110.
POP = Probability of Precipitation
Grand Lake Radar Loop
Use the map search tool if you want to place a location marker on the radar map...