Jefferson County, MO Weather Forecast
County weather hub
Sunny
Compare major city weather across Jefferson County, scan the latest forecast snapshots, and jump into local 7-day outlook pages from one hub.
Sunny, with a high near 88.
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
- Jul 14 to Jul 18, 2026
- Latest sync
- Jul 12, 2026 7:53 AM CDT
- Forecast office
- LSX
- Source
- NOAA / NWS
Daily Outlook
This Week in Jefferson County
Saturday looks like the warmest upcoming period in Jefferson County at 94 degrees F.
Tuesday Night is the coolest period ahead with temperatures near 68 degrees F.
The strongest winds are forecast for Saturday at about 6 mph W.
The forecast from Jul 14 through Jul 18 stays mostly dry.
Forecast Details
- Last updated
- Jul 12, 2026 7:53 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 clear, with a low around 68.
Sunny, with a high near 90.
Mostly clear, with a low around 70.
Sunny, with a high near 92.
Mostly clear, with a low around 71.
Sunny, with a high near 93.
Mostly clear, with a low around 73.
Sunny, with a high near 94.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Tuesday
Jul 14
|
Sunny
|
88°F |
1 to 5 mph
NE
|
|
Tuesday Night
Jul 14
|
Mostly Clear
|
68°F |
0 to 3 mph
NE
|
|
Wednesday
Jul 15
|
Sunny
|
90°F |
2 mph
E
|
|
Wednesday Night
Jul 15
|
Mostly Clear
|
70°F |
1 mph
N
|
|
Thursday
Jul 16
|
Sunny
|
92°F |
2 mph
NE
|
|
Thursday Night
Jul 16
|
Mostly Clear
|
71°F |
2 mph
SW
|
|
Friday
Jul 17
|
Sunny
|
93°F |
3 mph
W
|
|
Friday Night
Jul 17
|
Mostly Clear
|
73°F |
3 mph
SW
|
|
Saturday
Jul 18
|
Sunny
|
94°F |
6 mph
W
|
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.