Illinois weather in October: Statewide normals and every place, NOAA 1991-2020
In October, Illinois's statewide normal high is 66°F and normal low 44°F; normal highs run from 60°F in Barrington to 73°F in Anna (NOAA 1991-2020 normals).
- Statewide normal high
- 66°FOctober, 1991-2020
- Statewide normal low
- 44°FOctober, 1991-2020
- Statewide normal precipitation
- 3.26 inOctober
- Warmest place
- 73°Fnormal high, Anna
- Coolest place
- 60°Fnormal high, Barrington
Where is Illinois warmest and wettest in October?
Anna has the warmest October afternoons (73°F) and Barrington the coolest (60°F). Cairo gets the most precipitation (4.14 in) and Fulton the least (2.58 in).
Statewide, October averaged 60.2°F in 2021, 53.3°F in 2022, 56.6°F in 2023, 58.6°F in 2024, 59.6°F in 2025, against a 1991-2020 normal of 54.9°F.
| Place | High | Low | Precip. | Snow |
|---|---|---|---|---|
| Chicago | 63°F | 45°F | 3.43 | 0.2 |
| Aurora | 63°F | 43°F | 3.70 | 0.0 |
| Joliet | 63°F | 43°F | 3.14 | 0.0 |
| Rockford | 62°F | 42°F | 2.63 | 0.2 |
| Elgin | 63°F | 41°F | 3.31 | 0.0 |
| Springfield | 67°F | 45°F | 3.26 | 0.1 |
| Peoria | 65°F | 44°F | 3.17 | 0.1 |
| Champaign | 67°F | 43°F | 3.03 | – |
| Waukegan | 61°F | 43°F | – | – |
| Bloomington | 63°F | 42°F | 3.45 | – |
| Decatur | 66°F | 44°F | 3.18 | – |
| Wheaton | 65°F | 43°F | 3.56 | 0.0 |
| Normal | 66°F | 42°F | 3.48 | 0.0 |
| Moline | 65°F | 43°F | 2.81 | 0.3 |
| Crystal Lake | 62°F | 42°F | 3.20 | 0.2 |
| Romeoville | 64°F | 44°F | 3.67 | 0.1 |
| Belleville | 73°F | 47°F | 3.12 | 0.0 |
| DeKalb | 62°F | 41°F | 2.96 | 0.1 |
| Quincy | 65°F | 45°F | 3.05 | – |
| Streamwood | 65°F | 40°F | 3.51 | 0.1 |
| Wheeling | 63°F | 45°F | 3.11 | – |
| Rock Island | 64°F | 43°F | 2.89 | – |
| Mundelein | 61°F | 42°F | 3.20 | 0.0 |
| Galesburg | 63°F | 43°F | 2.82 | 0.0 |
| Burbank | 64°F | 47°F | 3.86 | 0.1 |
| Danville | 67°F | 44°F | 3.66 | – |
| West Chicago | 62°F | 42°F | 2.99 | – |
| Alton | 68°F | 48°F | 2.93 | – |
| Lisle | 63°F | 40°F | 3.58 | – |
| Kankakee | 65°F | 43°F | 3.40 | 0.0 |
| Freeport | 62°F | 39°F | 2.98 | 0.2 |
| Carbondale | 70°F | 45°F | 3.54 | – |
| Park Forest | 63°F | 42°F | 3.65 | 0.2 |
| Ottawa | 64°F | 43°F | 3.10 | 0.0 |
| Jacksonville | 67°F | 43°F | 3.11 | – |
| Charleston | 69°F | 46°F | 3.94 | 0.0 |
| Cahokia Heights | 69°F | 46°F | 3.07 | – |
| Mattoon | 66°F | 45°F | 3.11 | – |
| Dixon | 63°F | 42°F | 2.96 | 0.0 |
| Antioch | 61°F | 42°F | – | – |
| Morris | 64°F | 43°F | 3.23 | 0.0 |
| Channahon | 64°F | 44°F | 3.09 | 0.0 |
| Mount Vernon | 68°F | 45°F | 3.53 | 0.2 |
| Lincoln | 66°F | 42°F | 3.42 | 0.1 |
| Effingham | 69°F | 44°F | 3.49 | 0.0 |
| Streator | 65°F | 44°F | 2.98 | 0.0 |
| Rantoul | 67°F | 42°F | 3.32 | – |
| Kewanee | 64°F | 41°F | 2.93 | 0.3 |
| Pontiac | 65°F | 44°F | 3.24 | 0.0 |
| Barrington | 60°F | 42°F | 3.39 | 0.1 |
| Peru | 64°F | 41°F | 3.50 | 0.2 |
| Rochelle | 62°F | 40°F | 2.81 | – |
| Lake Villa | 60°F | 43°F | 3.04 | 0.1 |
| Monmouth | 65°F | 42°F | 3.01 | 0.2 |
| Olney | 69°F | 44°F | 3.83 | 0.0 |
| Jerseyville | 67°F | 43°F | 3.29 | 0.0 |
| Paris | 66°F | 43°F | 3.62 | 0.0 |
| Harrisburg | 71°F | 45°F | 3.76 | – |
| Marengo | 62°F | 40°F | 2.98 | 0.0 |
| Princeton | 63°F | 42°F | 3.14 | 0.3 |
| Vandalia | 68°F | 44°F | 3.26 | – |
| Robinson | 68°F | 44°F | 3.70 | – |
| Salem | 69°F | 45°F | 3.44 | 0.1 |
| Mount Carmel | 69°F | 47°F | 3.79 | 0.1 |
| Benton | 68°F | 47°F | – | – |
| Geneseo | 64°F | 43°F | 3.21 | 0.1 |
| Hillsboro | 70°F | 46°F | 3.41 | – |
| Du Quoin | 69°F | 46°F | 3.66 | 0.2 |
| Carlinville | 67°F | 44°F | 3.31 | 0.0 |
| Pana | 68°F | 44°F | 3.53 | 0.1 |
| Fairfield | 71°F | 47°F | 3.73 | – |
| Marseilles | 64°F | 41°F | 3.20 | 0.0 |
| Hoopeston | 66°F | 44°F | 3.43 | 0.1 |
| Carmi | 70°F | 43°F | 3.43 | 0.2 |
| Tuscola | 66°F | 43°F | 3.25 | 0.0 |
| Flora | 69°F | 44°F | 3.67 | 0.0 |
| Shelbyville | 67°F | 45°F | 3.57 | – |
| Watseka | 66°F | 41°F | 3.24 | 0.0 |
| Paxton | 65°F | 41°F | 3.25 | 0.0 |
| Lawrenceville | 69°F | 46°F | 3.51 | – |
| Sullivan | 67°F | 44°F | 3.30 | 0.0 |
| Anna | 73°F | 48°F | 3.89 | 0.2 |
| Pittsfield | 68°F | 44°F | 3.01 | 0.0 |
| Sparta | 70°F | 44°F | 3.34 | 0.0 |
| Dwight | 64°F | 40°F | 3.19 | 0.0 |
| Morrison | 62°F | 39°F | 2.77 | 0.1 |
| Fulton | 63°F | 43°F | 2.58 | – |
| Aledo | 64°F | 41°F | 2.82 | 0.3 |
| Gibson City | 64°F | 41°F | 3.40 | 0.1 |
| Carlyle | 70°F | 46°F | 3.39 | – |
| Galena | 61°F | 39°F | 3.02 | 0.4 |
| Virden | 67°F | 47°F | 3.39 | 0.0 |
| Nashville | 69°F | 46°F | 3.17 | 0.1 |
| Rushville | 65°F | 44°F | 3.43 | – |
| Knoxville | 64°F | 42°F | 3.03 | 0.2 |
| Havana | 68°F | 42°F | 3.37 | 0.0 |
| Newton | 68°F | 46°F | 3.84 | 0.0 |
| McLeansboro | 70°F | 43°F | 3.38 | 0.6 |
| Galva | 64°F | 40°F | 2.84 | – |
| Casey | 69°F | 44°F | 3.81 | 0.0 |
| Polo | 64°F | 40°F | 3.21 | – |
| White Hall | 67°F | 43°F | 3.02 | 0.0 |
| Petersburg | 66°F | 43°F | 3.19 | 0.0 |
| Mason City | 66°F | 43°F | 3.33 | 0.0 |
| Athens | 66°F | 43°F | 3.40 | – |
| Minonk | 66°F | 42°F | 3.08 | 0.0 |
| Albion | 71°F | 47°F | – | – |
| Lacon | 67°F | 44°F | 3.16 | 0.1 |
| Princeville | 65°F | 41°F | 3.11 | 0.0 |
| Chenoa | 64°F | 42°F | 3.23 | 0.0 |
| Stockton | 62°F | 40°F | 3.10 | 0.5 |
| Cairo | 71°F | 48°F | 4.14 | – |
| Winchester | 68°F | 43°F | 3.09 | – |
| Grayville | 70°F | 46°F | 3.90 | 0.0 |
| Mount Carroll | 64°F | 38°F | 3.02 | 0.4 |
| Neoga | 69°F | 43°F | 3.21 | – |
| Walnut | 63°F | 41°F | 2.97 | 0.2 |
| Palestine | 68°F | 46°F | 3.73 | 0.1 |
| La Harpe | 64°F | 42°F | 3.10 | – |
| Windsor | 66°F | 44°F | 3.60 | 0.0 |
| Morrisonville | 68°F | 44°F | 3.21 | 0.2 |
| Rosiclare | 69°F | 43°F | 3.57 | 0.2 |
| Ramsey | 67°F | 42°F | 3.55 | 0.0 |
| Shabbona | 62°F | 39°F | 2.98 | – |
| Paw Paw | 63°F | 40°F | 2.99 | 0.1 |
| Hennepin | 65°F | 43°F | 3.31 | – |
| Piper City | 68°F | 42°F | 3.68 | 0.0 |
| Ogden | 66°F | 44°F | 3.32 | 0.0 |
| Brookport | 71°F | 47°F | 4.08 | 0.0 |
| Elizabeth | 62°F | 39°F | 3.04 | 0.3 |
| Brownstown | 67°F | 45°F | 2.89 | – |
| Avon | 64°F | 40°F | 2.85 | 0.0 |
| Golden | 66°F | 43°F | – | – |
| New Boston | 64°F | 43°F | 2.86 | – |
| Congerville | 67°F | 43°F | 3.14 | 0.0 |
| Sidell | 65°F | 43°F | 3.33 | 0.0 |
| Altona | 64°F | 40°F | 2.77 | – |
| Prairie City | 66°F | 43°F | 2.99 | 0.0 |
| Perry | 68°F | 43°F | 3.10 | 0.0 |
| Compton | 63°F | 40°F | – | – |
| Gladstone | 65°F | 45°F | 2.80 | 0.1 |
| Bentley | 66°F | 44°F | 3.16 | 0.1 |
| Kaskaskia | 70°F | 46°F | 3.07 | 0.0 |
| Illinois City | 64°F | 43°F | 2.78 | – |
| Cahokia | 70°F | 46°F | 3.04 | 0.0 |
| Chicago Aurora Municipal Airport | 63°F | 41°F | 3.23 | – |
| Chicago Botanic Garden | 63°F | 43°F | 3.59 | 0.1 |
| Chicago Midway Airport | 63°F | 47°F | 3.48 | – |
| Chicago Waukegan Regional Airport | 61°F | 43°F | 3.25 | – |
| Dixon Springs Agricultural Center | 71°F | 46°F | 3.84 | 0.3 |
| Grand Chain Dam 53 | 71°F | 48°F | 4.04 | 0.1 |
| Iuka (12 mi SW) | 69°F | 45°F | 3.45 | 0.0 |
| Little Red School House | 65°F | 43°F | 3.68 | – |
| McHenry W.G. Stratton Lock and Dam | 63°F | 40°F | 3.21 | 0.1 |
| Rend Lake Dam | 69°F | 46°F | 3.44 | – |
| Smithland Lock and Dam | 70°F | 47°F | 3.61 | 0.0 |
Source: NOAA NCEI nClimDiv statewide normals; NOAA NCEI 1991-2020 monthly normals for each station.