Stephenson County, IL Weather Forecast
County weather hub
Mostly Cloudy
Compare major city weather across Stephenson County, scan the latest forecast snapshots, and jump into local 7-day outlook pages from one hub.
Mostly cloudy, with a high near 79.
County Weather Overview
This county weather page brings together forecast coverage for Stephenson County so visitors can compare temperatures, wind, and conditions across the region without hopping between unrelated pages.
Current forecast coverage spans 5 of 5 mapped cities in Stephenson County.
Page Snapshot
- Page focus
- county weather
- Forecast window
- Aug 29 to Sep 2, 2026
- Latest sync
- Aug 27, 2026 6:29 AM CDT
- Forecast office
- DVN
- Source
- NOAA / NWS
Daily Outlook
This Week in Stephenson County
Sunday looks like the warmest upcoming period in Stephenson County at 86 degrees F.
Saturday Night is the coolest period ahead with temperatures near 66 degrees F.
The strongest winds are forecast for Saturday at about 5 to 15 mph S.
Precipitation is mentioned in 8 upcoming forecast periods.
Forecast Details
- Last updated
- Aug 27, 2026 6:29 AM CDT
- Coverage
- 5 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
A chance of showers and thunderstorms between 7pm and 1am, then a chance of showers and thunderstorms. Mostly cloudy, with a low around 66. Chance of precipitation is 50%.
A chance of showers and thunderstorms before 1pm. Mostly sunny, with a high near 86. Chance of precipitation is 50%.
A chance of showers and thunderstorms after 7pm. Mostly cloudy, with a low around 71. Chance of precipitation is 50%.
A chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 86. Chance of precipitation is 50%.
A chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 70. Chance of precipitation is 40%.
A chance of showers and thunderstorms before 1pm. Mostly sunny, with a high near 85. Chance of precipitation is 40%.
A slight chance of rain showers between 7pm and 1am, then a chance of showers and thunderstorms. Partly cloudy, with a low around 68. Chance of precipitation is 30%.
A chance of showers and thunderstorms before 7am, then a slight chance of showers and thunderstorms between 7am and 1pm. Mostly sunny, with a high near 85. Chance of precipitation is 30%.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Saturday
Aug 29
|
Mostly Cloudy
|
79°F |
5 to 15 mph
S
|
|
Saturday Night
Aug 29
|
Chance Showers And Thunderstorms
|
66°F |
15 mph
S
|
|
Sunday
Aug 30
|
Chance Showers And Thunderstorms
|
86°F |
15 mph
S
|
|
Sunday Night
Aug 30
|
Chance Showers And Thunderstorms
|
71°F |
10 to 15 mph
S
|
|
Monday
Aug 31
|
Chance Showers And Thunderstorms
|
86°F |
10 mph
SW
|
|
Monday Night
Aug 31
|
Partly Cloudy then Chance Showers And Thunderstorms
|
70°F |
5 to 10 mph
SW
|
|
Tuesday
Sep 1
|
Chance Showers And Thunderstorms
|
85°F |
5 mph
SW
|
|
Tuesday Night
Sep 1
|
Chance Showers And Thunderstorms
|
68°F |
5 mph
SE
|
|
Wednesday
Sep 2
|
Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms
|
85°F |
5 to 10 mph
S
|
Major City Forecasts
Live forecast snapshots for major cities across Stephenson County.
Coverage
Forecast coverage currently spans 5 of 5 mapped cities in Stephenson County.
Largest mapped city population in this region: 23,447.
