Mercer County, IL Weather Forecast
County weather hub
Partly Sunny
Compare major city weather across Mercer County, scan the latest forecast snapshots, and jump into local 7-day outlook pages from one hub.
Partly sunny, with a high near 69.
County Weather Overview
This county weather page brings together forecast coverage for Mercer County so visitors can compare temperatures, wind, and conditions across the region without hopping between unrelated pages.
Current forecast coverage spans 2 of 2 mapped cities in Mercer County.
Page Snapshot
- Page focus
- county weather
- Forecast window
- Sep 25 to Sep 26, 2026
- Latest sync
- Sep 20, 2026 10:54 AM CDT
- Forecast office
- DVN
- Source
- NOAA / NWS
Daily Outlook
This Week in Mercer County
Saturday looks like the warmest upcoming period in Mercer County at 71 degrees F.
Friday Night is the coolest period ahead with temperatures near 52 degrees F.
The strongest winds are forecast for Friday at about 0 to 5 mph NE.
The forecast from Sep 25 through Sep 26 stays mostly dry.
Forecast Details
- Last updated
- Sep 20, 2026 10:54 AM CDT
- Coverage
- 2 days
- Time zone
- America/Chicago
- Forecast office
- DVN
- Radar station
- KDVN
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
Partly cloudy, with a low around 52.
Partly sunny, with a high near 71.
Partly cloudy, with a low around 54.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Friday
Sep 25
|
Partly Sunny
|
69°F |
0 to 5 mph
NE
|
|
Friday Night
Sep 25
|
Partly Cloudy
|
52°F |
0 to 5 mph
E
|
|
Saturday
Sep 26
|
Partly Sunny
|
71°F |
0 to 5 mph
E
|
|
Saturday Night
Sep 26
|
Partly Cloudy
|
54°F |
0 to 5 mph
E
|
Major City Forecasts
Live forecast snapshots for major cities across Mercer County.
Coverage
Forecast coverage currently spans 2 of 2 mapped cities in Mercer County.
Largest mapped city population in this region: 3,383.
