Lake Saint Louis, MO Weather Forecast
Local 7-day forecast
Partly Sunny
Track current conditions, temperature changes, wind, and the full daily outlook for Lake Saint Louis, MO in one place.
Partly sunny, with a high near 84.
Local Weather Overview
This forecast page for Lake Saint Louis, MO is designed for quick trip planning, giving you a clean read on daytime highs, overnight lows, and changing conditions across the upcoming forecast window. Latest sync: May 23, 2026 3:30 AM CDT.
The active forecast window currently covers May 25 to May 29, 2026 for Lake Saint Louis, MO.
Page Snapshot
- Page focus
- city weather
- Forecast window
- May 25 to May 29, 2026
- Latest sync
- May 23, 2026 3:30 AM CDT
- Forecast office
- LSX
- Source
- NOAA / NWS
Daily Outlook
This Week in Lake Saint Louis
Memorial Day looks like the warmest upcoming period in Lake Saint Louis at 84 degrees F.
Monday Night is the coolest period ahead with temperatures near 64 degrees F.
The strongest winds are forecast for Friday at about 6 to 9 mph NE.
Precipitation is mentioned in 7 upcoming forecast periods.
Forecast Details
- Last updated
- May 23, 2026 3:30 AM CDT
- Coverage
- 5 days
- Time zone
- America/Chicago
- Forecast office
- LSX
- Radar station
- KLSX
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
Mostly cloudy, with a low around 64.
A slight chance of rain showers between 7am and 1pm, then a chance of showers and thunderstorms. Mostly cloudy, with a high near 81. Chance of precipitation is 70%.
A chance of showers and thunderstorms before 7pm, then showers and thunderstorms likely. Mostly cloudy, with a low around 66. Chance of precipitation is 70%.
Showers and thunderstorms likely. Partly sunny, with a high near 84. Chance of precipitation is 70%.
Showers and thunderstorms likely before 7pm, then a chance of showers and thunderstorms. Mostly cloudy, with a low around 66. Chance of precipitation is 60%.
A slight chance of showers and thunderstorms before 7am, then showers and thunderstorms likely. Mostly cloudy, with a high near 83. Chance of precipitation is 70%.
Showers and thunderstorms likely before 7pm, then a chance of showers and thunderstorms. Mostly cloudy, with a low around 65. Chance of precipitation is 70%.
A chance of rain showers. Partly sunny, with a high near 81. Chance of precipitation is 40%.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Memorial Day
May 25
|
Partly Sunny
|
84°F |
0 to 5 mph
E
|
|
Monday Night
May 25
|
Mostly Cloudy
|
64°F |
3 mph
E
|
|
Tuesday
May 26
|
Slight Chance Rain Showers then Chance Showers And Thunderstorms
|
81°F |
2 to 7 mph
E
|
|
Tuesday Night
May 26
|
Chance Showers And Thunderstorms then Showers And Thunderstorms Likely
|
66°F |
6 mph
E
|
|
Wednesday
May 27
|
Showers And Thunderstorms Likely
|
84°F |
6 mph
SE
|
|
Wednesday Night
May 27
|
Showers And Thunderstorms Likely then Chance Showers And Thunderstorms
|
66°F |
3 mph
E
|
|
Thursday
May 28
|
Slight Chance Showers And Thunderstorms then Showers And Thunderstorms Likely
|
83°F |
5 mph
E
|
|
Thursday Night
May 28
|
Showers And Thunderstorms Likely then Chance Showers And Thunderstorms
|
65°F |
5 mph
NE
|
|
Friday
May 29
|
Chance Rain Showers
|
81°F |
6 to 9 mph
NE
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Lake Saint Louis.