Mason County, IL Weather Forecast
County weather hub
Showers And Thunderstorms
Compare major city weather across Mason County, scan the latest forecast snapshots, and jump into local 7-day outlook pages from one hub.
Showers and thunderstorms before 4pm, then a chance of showers and thunderstorms. Mostly cloudy, with a high near 73. Southeast wind around 6 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
County Weather Overview
This county weather page brings together forecast coverage for Mason 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 Mason County.
Page Snapshot
- Page focus
- county weather
- Forecast window
- Oct 15 to Oct 20, 2026
- Latest sync
- Oct 14, 2026 4:01 AM CDT
- Forecast office
- ILX
- Source
- NOAA / NWS
Daily Outlook
This Week in Mason County
Tuesday looks like the warmest upcoming period in Mason County at 77 degrees F.
Friday Night is the coolest period ahead with temperatures near 35 degrees F.
The strongest winds are forecast for Friday at about 16 to 20 mph NW.
Precipitation is mentioned in 2 upcoming forecast periods.
Forecast Details
- Last updated
- Oct 14, 2026 4:01 AM CDT
- Coverage
- 6 days
- Time zone
- America/Chicago
- Forecast office
- ILX
- Radar station
- KILX
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
Showers and thunderstorms likely before 1am. Mostly cloudy, with a low around 44. West northwest wind 6 to 16 mph, with gusts as high as 31 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch possible.
Partly sunny, with a high near 57. Northwest wind 16 to 20 mph, with gusts as high as 36 mph.
Areas of frost after 5am. Mostly clear, with a low around 35. North wind 1 to 13 mph, with gusts as high as 24 mph.
Areas of frost before 8am. Sunny, with a high near 58.
Clear, with a low around 37.
Sunny, with a high near 70.
Partly cloudy, with a low around 44.
Partly sunny, with a high near 72.
Partly cloudy, with a low around 46.
Sunny, with a high near 77.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Thursday
Oct 15
|
Showers And Thunderstorms
|
73°F |
6 mph
SE
|
|
Thursday Night
Oct 15
|
Showers And Thunderstorms Likely
|
44°F |
6 to 16 mph
WNW
|
|
Friday
Oct 16
|
Partly Sunny
|
57°F |
16 to 20 mph
NW
|
|
Friday Night
Oct 16
|
Mostly Clear then Areas Of Frost
|
35°F |
1 to 13 mph
N
|
|
Saturday
Oct 17
|
Areas Of Frost then Sunny
|
58°F |
2 mph
SW
|
|
Saturday Night
Oct 17
|
Clear
|
37°F |
1 to 5 mph
S
|
|
Sunday
Oct 18
|
Sunny
|
70°F |
5 to 9 mph
S
|
|
Sunday Night
Oct 18
|
Partly Cloudy
|
44°F |
6 mph
S
|
|
Monday
Oct 19
|
Partly Sunny
|
72°F |
5 mph
SSW
|
|
Monday Night
Oct 19
|
Partly Cloudy
|
46°F |
2 mph
S
|
|
Tuesday
Oct 20
|
Sunny
|
77°F |
3 mph
SSE
|
Major City Forecasts
Live forecast snapshots for major cities across Mason County.
Coverage
Forecast coverage currently spans 2 of 2 mapped cities in Mason County.
Largest mapped city population in this region: 2,945.
