Union County, IL Weather Forecast
County weather hub
Chance Showers And Thunderstorms
Compare major city weather across Union County, scan the latest forecast snapshots, and jump into local 7-day outlook pages from one hub.
A chance of rain showers before 7am, then a chance of showers and thunderstorms between 7am and 1pm, then a chance of showers and thunderstorms. Partly sunny, with a high near 83. South southeast wind 3 to 8 mph.
County Weather Overview
This county weather page brings together forecast coverage for Union 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 Union County.
Page Snapshot
- Page focus
- county weather
- Forecast window
- May 26, 2026
- Latest sync
- May 20, 2026 5:29 PM CDT
- Forecast office
- PAH
- Source
- NOAA / NWS
Daily Outlook
This Week in Union County
Tuesday looks like the warmest upcoming period in Union County at 83 degrees F.
Tuesday Night is the coolest period ahead with temperatures near 67 degrees F.
The strongest winds are forecast for Tuesday at about 3 to 8 mph SSE.
Precipitation is mentioned in 2 upcoming forecast periods.
Forecast Details
- Last updated
- May 20, 2026 5:29 PM CDT
- Coverage
- 1 day
- Time zone
- America/Chicago
- Forecast office
- PAH
- Radar station
- KPAH
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 before 7pm, then a chance of showers and thunderstorms. Mostly cloudy, with a low around 67. South southeast wind 2 to 7 mph.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Tuesday
May 26
|
Chance Showers And Thunderstorms
|
83°F |
3 to 8 mph
SSE
|
|
Tuesday Night
May 26
|
Chance Showers And Thunderstorms
|
67°F |
2 to 7 mph
SSE
|
Major City Forecasts
Live forecast snapshots for major cities across Union County.
Coverage
Forecast coverage currently spans 2 of 2 mapped cities in Union County.
Largest mapped city population in this region: 4,059.