Weather WorldFlat Lake, LA 7-Day Night Weather Forecast
Quick Weather Clicks
Settings
Sun & Moon
Weather Quote O' the Day
Flat Lake, LA Weather Forecast
Flat Lake, LA Weather Forecast Date: 307 PM CDT Sun Sep 13 2026
The area/counties/county of: Lower St. Martin, including the city of Stephensville.or toggle through each period.
Tonight... Mostly clear. Lows in the upper 70s. Light and variable winds.
Monday... Mostly sunny. A chance of showers and thunderstorms in the afternoon. Humid with highs in the lower 90s. Temperature falling into the upper 80s in the afternoon. North winds around 5 mph, becoming southeast in the afternoon. Chance of rain 40%. Heat index values up to 109.
Monday Night... Mostly clear. Humid with lows in the mid 70s. Light and variable winds.
Tuesday... Sunny with highs in the lower 90s. Northeast winds around 5 mph, becoming southeast around 5 mph in the afternoon. Heat index values up to 106.
Tuesday Night... Mostly clear. Humid with lows in the upper 70s. Southeast winds around 5 mph, becoming northeast after midnight.
Wednesday... Mostly sunny. Showers likely with a chance of thunderstorms in the afternoon. Highs in the lower 90s. Temperature falling into the mid 80s in the afternoon. Chance of rain 60%. Heat index values up to 110.
Wednesday Night... Mostly clear. Lows in the mid 70s. Highs in the lower 90s.
Thursday... Mostly clear. Lows in the mid 70s. Highs in the lower 90s.
Thursday Night... Clear. Lows in the lower 70s.
Friday... Mostly clear. Highs in the lower 90s. Lows in the lower 70s.
Friday Night... Mostly clear. Highs in the lower 90s. Lows in the lower 70s.
Saturday... Sunny. A chance of showers and thunderstorms in the afternoon. Highs in the lower 90s. Chance of rain 40%.
Saturday Night... Partly cloudy in the evening, then clearing. Lows in the mid 70s.
POP = Probability of Precipitation
Flat Lake Radar Loop
Use the map search tool if you want to place a location marker on the radar map...