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Weather alerts in Illinois today: does anything affect me?
National Weather Service
Official Freeze Warning in effect for Illinois.
What it means
- Freeze or cold: protect sensitive plants, pets and outdoor pipes. In extreme cold, dress in layers, limit time outdoors and use space heaters and generators safely.
Always follow your local National Weather Service office and local officials. Details below.
Official weather alerts for Illinois
Freeze Warning until Sat, Oct 17, 9:00 AM CDT
Freeze Warning issued October 16 at 8:43PM CDT until October 17 at 9:00AM CDT by NWS Quad Cities IA IL
Buchanan; Delaware; Dubuque; Benton; Linn; Jones; Jackson; Iowa; Johnson; Cedar; Clinton; Muscatine; Scott; Keokuk; Washington; Jefferson; Jo Daviess; Stephenson; Carroll; Whiteside; Rock Island
Full text from the National Weather Service
FREEZE WARNING REMAINS IN EFFECT FROM 1 AM TO 9 AM CDT SATURDAY
* WHAT...Sub-freezing temperatures as low as 30 expected. * WHERE...Portions of northwest Illinois and east central, northeast, and southeast Iowa. * WHEN...From 1 AM to 9 AM CDT Saturday. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing.
Instructions: Take steps now to protect tender plants from the cold.
Official NWS page · NWS Quad Cities IA IL
Freeze Warning until Sat, Oct 17, 8:00 AM CDT
Freeze Warning issued October 16 at 1:59PM CDT until October 17 at 8:00AM CDT by NWS Chicago IL
Winnebago; Boone; McHenry; Ogle; Lee; De Kalb; Kane
Full text from the National Weather Service
FREEZE WARNING REMAINS IN EFFECT FROM 5 AM TO 8 AM CDT SATURDAY
* WHAT...Sub-freezing temperatures are expected. * WHERE...Boone, De Kalb, Lee, Ogle, Winnebago, Kane, and McHenry Counties. * WHEN...From 5 AM to 8 AM CDT Saturday. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing.
Instructions: Take steps now to protect tender plants from the cold.
Official NWS page · NWS Chicago IL
5 advisories and statements
Frost Advisory until Sat, Oct 17, 9:00 AM CDT
Frost Advisory issued October 16 at 8:43PM CDT until October 17 at 9:00AM CDT by NWS Quad Cities IA IL
Louisa; Henry; Des Moines; Van Buren; Lee; Henry; Bureau; Putnam; Mercer; Henderson; Warren; Hancock; McDonough; Scotland; Clark
Full text from the National Weather Service
FROST ADVISORY REMAINS IN EFFECT FROM 1 AM TO 9 AM CDT SATURDAY
* WHAT...Temperatures as low as 32 will result in frost formation. * WHERE...Portions of north central, northwest, and west central Illinois, southeast Iowa, and northeast Missouri. * WHEN...From 1 AM to 9 AM CDT Saturday. * IMPACTS...Frost could harm sensitive outdoor vegetation. Sensitive outdoor plants may be killed if left uncovered.
Instructions: Take steps now to protect tender plants from the cold.
Official NWS page · NWS Quad Cities IA IL
Frost Advisory until Sat, Oct 17, 9:00 AM CDT
Frost Advisory issued October 16 at 2:54PM CDT until October 17 at 9:00AM CDT by NWS Lincoln IL
Knox; Stark; Peoria; Marshall; Woodford; Fulton; Tazewell; Schuyler; Mason; Logan; Cass; Menard; Scott; Morgan; Sangamon; Christian
Full text from the National Weather Service
FROST ADVISORY REMAINS IN EFFECT FROM 1 AM TO 9 AM CDT SATURDAY
* WHAT...Temperatures as low as 33 will result in frost formation. * WHERE...Portions of central and west central Illinois. * WHEN...From 1 AM to 9 AM CDT Saturday. * IMPACTS...Frost could harm sensitive outdoor vegetation. Sensitive outdoor plants may be killed if left uncovered.
Instructions: Take steps now to protect tender plants from the cold.
Official NWS page · NWS Lincoln IL
Frost Advisory until Sat, Oct 17, 9:00 AM CDT
Frost Advisory issued October 16 at 2:53PM CDT until October 17 at 9:00AM CDT by NWS St Louis MO
Greene; Macoupin; Montgomery; Adams; Brown; Pike; Calhoun; Jersey; Knox; Lewis; Shelby; Marion; Monroe; Ralls; Pike; Audrain; Lincoln
Full text from the National Weather Service
FROST ADVISORY REMAINS IN EFFECT FROM 1 AM TO 9 AM CDT SATURDAY
* WHAT...Temperatures as low as 34 will result in frost formation. * WHERE...Portions of south central, southwest, and west central Illinois and central, east central, and northeast Missouri. * WHEN...From 1 AM to 9 AM CDT Saturday. * IMPACTS...Frost could harm sensitive outdoor vegetation. Sensitive outdoor plants may be killed if left uncovered.
Instructions: Take steps now to protect tender plants from the cold.
Official NWS page · NWS St Louis MO
Frost Advisory until Sat, Oct 17, 8:00 AM CDT
Frost Advisory issued October 16 at 1:59PM CDT until October 17 at 8:00AM CDT by NWS Chicago IL
La Salle; Kendall
Full text from the National Weather Service
FROST ADVISORY REMAINS IN EFFECT FROM 5 AM TO 8 AM CDT SATURDAY
* WHAT...Temperatures as low as 34 will result in frost formation. * WHERE...La Salle and Kendall Counties. * WHEN...From 5 AM to 8 AM CDT Saturday. * IMPACTS...Frost could harm sensitive outdoor vegetation. Sensitive outdoor plants may be killed if left uncovered.
Instructions: Take steps now to protect tender plants from the cold.
Official NWS page · NWS Chicago IL
Frost Advisory until Sat, Oct 17, 8:00 AM CDT
Frost Advisory issued October 16 at 1:59PM CDT until October 17 at 8:00AM CDT by NWS Chicago IL
Lake
Full text from the National Weather Service
FROST ADVISORY REMAINS IN EFFECT FROM 5 AM TO 8 AM CDT SATURDAY AWAY FROM LAKE MICHIGAN
* WHAT...Temperatures as low as 33 will result in frost formation. * WHERE...Lake IL County. * WHEN...From 5 AM to 8 AM CDT Saturday. * IMPACTS...Frost could harm sensitive outdoor vegetation. Sensitive outdoor plants may be killed if left uncovered.
Instructions: Take steps now to protect tender plants from the cold.
Official NWS page · NWS Chicago IL
Storm Prediction Center · today's severe-storm outlook · issued 1 h ago
None of these cities are inside today's thunderstorm or severe-storm areas.
Official SPC Day 1 Convective Outlook (NOAA), valid until Sat, Oct 17, 7:00 AM CDT. It shows the chance of severe storms in the area, not a warning for your street. SPC outlook
U.S. Drought Monitor · map of October 13
21% of Illinois is in drought.
Share of the state's area. Updated every Thursday by the U.S. Drought Monitor (National Drought Mitigation Center, USDA and NOAA). Drought builds over weeks and months: one rainy day rarely ends it.
Weather in Illinois now
What is normal in October in Illinois
changing season Fall: usually calmer, with occasional severe storms along autumn cold fronts. The first freeze and snow arrive by November.
El Niño is under way, and NOAA expects it to be strong (NOAA, October 8, 2026).
In the Midwest it tends to bring a milder winter with less snow, especially in the north.
These are general tendencies: every year is different, and your local forecast comes first.
Typical climate per NOAA and regional weather services. It describes the season, not the forecast for a given day.
Where will it rain most? Forecast by city
Total rain each day, in inches. Wettest cities first.
| City | Tomorrow | Sunday | Monday |
|---|---|---|---|
| Chicago | 0 | 0 | 0 |
| Springfield | 0 | 0 | 0 |
| Peoria | 0 | 0 | 0 |
| Rockford | 0 | 0 | 0 |
| Champaign | 0 | 0 | 0 |
| Carbondale | 0 | 0 | 0 |
Automatic forecast from a computer model (MET Norway, data CC BY 4.0). Not an official alert: for watches and warnings, follow National Weather Service.
What do the inches mean?
As a rough guide: under a quarter inch in a day is light rain; 1 to 2 inches is a heavy downpour; more than 2 inches in a day is very heavy rain that can flood low-lying areas and roads.
Several rainy days in a row saturate the ground: even a modest storm can then cause flash flooding and rising rivers.
Cities in Illinois
Official sources for Illinois
Emergency: 911