Jefferson County, MO Weather Forecast
County weather hub
Slight Chance Showers And Thunderstorms
Compare major city weather across Jefferson County, scan the latest forecast snapshots, and jump into local 7-day outlook pages from one hub.
A slight chance of showers and thunderstorms after 3pm. Mostly cloudy, with a high near 83. South wind around 10 mph. Chance of precipitation is 20%.
County Weather Overview
This county weather page brings together forecast coverage for Jefferson County so visitors can compare temperatures, wind, and conditions across the region without hopping between unrelated pages.
Current forecast coverage spans 8 of 8 mapped cities in Jefferson County.
Page Snapshot
- Page focus
- county weather
- Forecast window
- May 15 to May 21, 2026
- Latest sync
- May 15, 2026 4:18 PM CDT
- Forecast office
- LSX
- Source
- NOAA / NWS
Daily Outlook
This Week in Jefferson County
Sunday looks like the warmest upcoming period in Jefferson County at 90 degrees F.
Wednesday Night is the coolest period ahead with temperatures near 52 degrees F.
The strongest winds are forecast for Monday at about 12 mph S.
Precipitation is mentioned in 12 upcoming forecast periods.
Forecast Details
- Last updated
- May 15, 2026 4:18 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 chance of showers and thunderstorms. Mostly cloudy. Low around 66, with temperatures rising to around 71 overnight. South wind 5 to 9 mph, with gusts as high as 23 mph. Chance of precipitation is 30%.
Showers and thunderstorms likely. Mostly cloudy. High near 84, with temperatures falling to around 80 in the afternoon. South wind 5 to 9 mph, with gusts as high as 21 mph. Chance of precipitation is 60%.
A slight chance of showers and thunderstorms before 9pm. Partly cloudy, with a low around 63. Southeast wind around 7 mph. Chance of precipitation is 20%.
Sunny, with a high near 90. South wind 6 to 10 mph, with gusts as high as 23 mph.
Mostly clear, with a low around 68.
A chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 90. Chance of precipitation is 40%.
A chance of showers and thunderstorms. Partly cloudy, with a low around 69. Chance of precipitation is 50%.
A chance of showers and thunderstorms before 7am, then showers and thunderstorms. Partly sunny, with a high near 82. Chance of precipitation is 80%.
Showers and thunderstorms. Mostly cloudy, with a low around 58. Chance of precipitation is 80%.
A chance of showers and thunderstorms. Partly sunny, with a high near 72. Chance of precipitation is 50%.
A slight chance of rain showers. Mostly cloudy, with a low around 52. Chance of precipitation is 20%.
A slight chance of rain showers before 7am, then a slight chance of showers and thunderstorms. Partly sunny, with a high near 74. Chance of precipitation is 20%.
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 54. Chance of precipitation is 20%.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
This Afternoon
May 15
|
Slight Chance Showers And Thunderstorms
|
83°F |
10 mph
S
|
|
Tonight
May 15
|
Chance Showers And Thunderstorms
|
66°F |
5 to 9 mph
S
|
|
Saturday
May 16
|
Showers And Thunderstorms Likely
|
84°F |
5 to 9 mph
S
|
|
Saturday Night
May 16
|
Slight Chance Showers And Thunderstorms then Partly Cloudy
|
63°F |
7 mph
SE
|
|
Sunday
May 17
|
Sunny
|
90°F |
6 to 10 mph
S
|
|
Sunday Night
May 17
|
Mostly Clear
|
68°F |
9 mph
S
|
|
Monday
May 18
|
Partly Sunny then Chance Showers And Thunderstorms
|
90°F |
12 mph
S
|
|
Monday Night
May 18
|
Chance Showers And Thunderstorms
|
69°F |
12 mph
S
|
|
Tuesday
May 19
|
Chance Showers And Thunderstorms then Showers And Thunderstorms
|
82°F |
6 to 9 mph
SW
|
|
Tuesday Night
May 19
|
Showers And Thunderstorms
|
58°F |
6 mph
NW
|
|
Wednesday
May 20
|
Chance Showers And Thunderstorms
|
72°F |
5 mph
N
|
|
Wednesday Night
May 20
|
Slight Chance Rain Showers
|
52°F |
5 mph
NE
|
|
Thursday
May 21
|
Slight Chance Rain Showers then Slight Chance Showers And Thunderstorms
|
74°F |
5 mph
NE
|
|
Thursday Night
May 21
|
Slight Chance Showers And Thunderstorms
|
54°F |
3 mph
E
|
Major City Forecasts
Live forecast snapshots for major cities across Jefferson County.
Coverage
Forecast coverage currently spans 8 of 8 mapped cities in Jefferson County.
Largest mapped city population in this region: 21,145.