Saint John, MO Weather Forecast
Local 7-day forecast
Sunny then Slight Chance Showers And Thunderstorms
Track current conditions, temperature changes, wind, and the full daily outlook for Saint John, MO in one place.
A slight chance of showers and thunderstorms after 2pm. Sunny, with a high near 96. Heat index values as high as 106. Southwest wind 3 to 8 mph. Chance of precipitation is 20%.
Local Weather Overview
This forecast page for Saint John, 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: Jul 2, 2026 11:48 PM CDT.
The active forecast window currently covers Jul 3 to Jul 9, 2026 for Saint John, MO.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Jul 3 to Jul 9, 2026
- Latest sync
- Jul 2, 2026 11:48 PM CDT
- Forecast office
- LSX
- Source
- NOAA / NWS
Daily Outlook
This Week in Saint John
Friday looks like the warmest upcoming period in Saint John at 96 degrees F.
Monday Night is the coolest period ahead with temperatures near 72 degrees F.
The strongest winds are forecast for Friday at about 3 to 8 mph SW.
Precipitation is mentioned in 13 upcoming forecast periods.
Forecast Details
- Last updated
- Jul 2, 2026 11:48 PM CDT
- Coverage
- 7 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
A slight chance of showers and thunderstorms before 8pm. Mostly clear, with a low around 77. Heat index values as high as 102. South wind 3 to 7 mph. Chance of precipitation is 20%.
A slight chance of rain showers between 7am and 10am, then a chance of showers and thunderstorms. Mostly sunny, with a high near 94. Heat index values as high as 105. Southwest wind around 6 mph. Chance of precipitation is 30%.
A chance of showers and thunderstorms. Partly cloudy, with a low around 75. Southwest wind around 5 mph. Chance of precipitation is 50%.
A chance of showers and thunderstorms. Mostly sunny, with a high near 92. Chance of precipitation is 50%.
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 73. Chance of precipitation is 20%.
A slight chance of rain showers before 7am, then a slight chance of showers and thunderstorms. Mostly sunny, with a high near 90. Chance of precipitation is 20%.
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 72. Chance of precipitation is 20%.
A slight chance of rain showers before 7am, then a chance of showers and thunderstorms. Mostly sunny, with a high near 90. Chance of precipitation is 30%.
A chance of showers and thunderstorms before 7pm. Partly cloudy, with a low around 72. Chance of precipitation is 30%.
A chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 91. Chance of precipitation is 30%.
A chance of showers and thunderstorms. Partly cloudy, with a low around 73. Chance of precipitation is 30%.
A chance of rain showers before 1pm, then a chance of showers and thunderstorms. Mostly sunny, with a high near 92. Chance of precipitation is 30%.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Friday
Jul 3
|
Sunny then Slight Chance Showers And Thunderstorms
|
96°F |
3 to 8 mph
SW
|
|
Friday Night
Jul 3
|
Slight Chance Showers And Thunderstorms then Mostly Clear
|
77°F |
3 to 7 mph
S
|
|
Independence Day
Jul 4
|
Chance Showers And Thunderstorms
|
94°F |
6 mph
SW
|
|
Saturday Night
Jul 4
|
Chance Showers And Thunderstorms
|
75°F |
5 mph
SW
|
|
Sunday
Jul 5
|
Chance Showers And Thunderstorms
|
92°F |
5 mph
NW
|
|
Sunday Night
Jul 5
|
Slight Chance Showers And Thunderstorms
|
73°F |
5 mph
NE
|
|
Monday
Jul 6
|
Slight Chance Showers And Thunderstorms
|
90°F |
6 mph
N
|
|
Monday Night
Jul 6
|
Slight Chance Showers And Thunderstorms
|
72°F |
2 to 6 mph
NE
|
|
Tuesday
Jul 7
|
Chance Showers And Thunderstorms
|
90°F |
2 to 6 mph
NE
|
|
Tuesday Night
Jul 7
|
Chance Showers And Thunderstorms then Partly Cloudy
|
72°F |
1 to 6 mph
E
|
|
Wednesday
Jul 8
|
Mostly Sunny then Chance Showers And Thunderstorms
|
91°F |
5 mph
SE
|
|
Wednesday Night
Jul 8
|
Chance Showers And Thunderstorms
|
73°F |
5 mph
SE
|
|
Thursday
Jul 9
|
Chance Rain Showers
|
92°F |
3 to 7 mph
S
|
Nearby Forecasts
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