Illinois weather in July: Statewide normals and every place, NOAA 1991-2020
In July, Illinois's statewide normal high is 86°F and normal low 65°F; normal highs run from 81°F in Barrington to 90°F in Belleville (NOAA 1991-2020 normals).
- Statewide normal high
- 86°FJuly, 1991-2020
- Statewide normal low
- 65°FJuly, 1991-2020
- Statewide normal precipitation
- 4.06 inJuly
- Warmest place
- 90°Fnormal high, Belleville
- Coolest place
- 81°Fnormal high, Barrington
Where is Illinois warmest and wettest in July?
Belleville has the warmest July afternoons (90°F) and Barrington the coolest (81°F). Grayville gets the most precipitation (5.28 in) and Morrisonville the least (2.95 in).
Statewide, July averaged 74.6°F in 2021, 75.8°F in 2022, 75.3°F in 2023, 74.0°F in 2024, 78.3°F in 2025, 76.8°F in 2026, against a 1991-2020 normal of 75.4°F.
| Place | High | Low | Precip. | Snow |
|---|---|---|---|---|
| Chicago | 85°F | 66°F | 3.71 | 0.0 |
| Aurora | 84°F | 65°F | 4.19 | 0.0 |
| Joliet | 84°F | 64°F | 4.55 | 0.0 |
| Rockford | 84°F | 64°F | 3.81 | 0.0 |
| Elgin | 84°F | 63°F | 3.98 | 0.0 |
| Springfield | 87°F | 66°F | 3.85 | 0.0 |
| Peoria | 86°F | 66°F | 3.53 | 0.0 |
| Champaign | 85°F | 64°F | 3.87 | – |
| Waukegan | 82°F | 63°F | – | – |
| Bloomington | 84°F | 63°F | 4.05 | – |
| Decatur | 86°F | 66°F | 3.32 | – |
| Wheaton | 86°F | 63°F | 3.86 | 0.0 |
| Normal | 86°F | 63°F | 4.12 | 0.0 |
| Moline | 86°F | 65°F | 4.23 | 0.0 |
| Crystal Lake | 84°F | 63°F | 3.90 | 0.0 |
| Romeoville | 85°F | 65°F | 4.50 | 0.0 |
| Belleville | 90°F | 68°F | 4.03 | 0.0 |
| DeKalb | 83°F | 63°F | 4.00 | 0.0 |
| Quincy | 86°F | 67°F | 3.49 | – |
| Streamwood | 87°F | 61°F | 3.34 | 0.0 |
| Wheeling | 84°F | 66°F | 3.15 | – |
| Rock Island | 84°F | 65°F | 4.22 | – |
| Mundelein | 82°F | 62°F | 4.01 | 0.0 |
| Galesburg | 84°F | 65°F | 4.04 | 0.0 |
| Burbank | 85°F | 68°F | 4.02 | 0.0 |
| Danville | 85°F | 65°F | 4.34 | – |
| West Chicago | 84°F | 63°F | 3.62 | – |
| Alton | 87°F | 69°F | 3.95 | – |
| Lisle | 84°F | 62°F | 4.25 | – |
| Kankakee | 85°F | 65°F | 4.65 | 0.0 |
| Freeport | 82°F | 62°F | 4.21 | 0.0 |
| Carbondale | 88°F | 68°F | 3.61 | – |
| Park Forest | 84°F | 64°F | 4.73 | 0.0 |
| Ottawa | 83°F | 64°F | 3.63 | 0.0 |
| Jacksonville | 87°F | 65°F | 3.97 | – |
| Charleston | 88°F | 66°F | 4.40 | 0.0 |
| Cahokia Heights | 89°F | 69°F | 3.70 | – |
| Mattoon | 86°F | 66°F | 3.96 | – |
| Dixon | 83°F | 64°F | 4.29 | 0.0 |
| Antioch | 82°F | 64°F | – | – |
| Morris | 85°F | 65°F | 4.92 | 0.0 |
| Channahon | 85°F | 65°F | 3.85 | 0.0 |
| Mount Vernon | 86°F | 67°F | 3.78 | 0.0 |
| Lincoln | 86°F | 64°F | 4.91 | 0.0 |
| Effingham | 89°F | 66°F | 4.29 | 0.0 |
| Streator | 88°F | 66°F | 4.10 | 0.0 |
| Rantoul | 88°F | 64°F | 4.44 | – |
| Kewanee | 84°F | 63°F | 3.69 | 0.0 |
| Pontiac | 84°F | 66°F | 3.71 | 0.0 |
| Barrington | 81°F | 63°F | 4.02 | 0.0 |
| Peru | 84°F | 63°F | 3.89 | 0.0 |
| Rochelle | 82°F | 61°F | 3.55 | – |
| Lake Villa | 82°F | 63°F | 3.92 | 0.0 |
| Monmouth | 84°F | 64°F | 3.96 | 0.0 |
| Olney | 87°F | 66°F | 4.96 | 0.0 |
| Jerseyville | 87°F | 66°F | 3.56 | 0.0 |
| Paris | 84°F | 64°F | 3.83 | 0.0 |
| Harrisburg | 89°F | 68°F | 3.49 | – |
| Marengo | 84°F | 62°F | 4.05 | 0.0 |
| Princeton | 85°F | 63°F | 3.66 | 0.0 |
| Vandalia | 87°F | 67°F | 3.90 | – |
| Robinson | 87°F | 66°F | 4.17 | – |
| Salem | 88°F | 67°F | 4.07 | 0.0 |
| Mount Carmel | 87°F | 69°F | 4.47 | 0.0 |
| Benton | 88°F | 68°F | – | – |
| Geneseo | 86°F | 65°F | 4.13 | 0.0 |
| Hillsboro | 89°F | 67°F | 3.74 | – |
| Du Quoin | 87°F | 68°F | 3.94 | 0.0 |
| Carlinville | 86°F | 66°F | 3.44 | 0.0 |
| Pana | 87°F | 65°F | 4.01 | 0.0 |
| Fairfield | 90°F | 68°F | 3.83 | – |
| Marseilles | 84°F | 62°F | 3.85 | 0.0 |
| Hoopeston | 85°F | 65°F | 4.59 | 0.0 |
| Carmi | 88°F | 66°F | 4.43 | 0.0 |
| Tuscola | 85°F | 65°F | 4.38 | 0.0 |
| Flora | 89°F | 66°F | 4.19 | 0.0 |
| Shelbyville | 86°F | 67°F | 4.06 | – |
| Watseka | 85°F | 63°F | 4.20 | 0.0 |
| Paxton | 84°F | 62°F | 4.00 | 0.0 |
| Lawrenceville | 88°F | 67°F | 4.22 | – |
| Sullivan | 86°F | 65°F | 4.35 | 0.0 |
| Anna | 90°F | 69°F | 3.70 | 0.0 |
| Pittsfield | 88°F | 66°F | 4.10 | 0.0 |
| Sparta | 88°F | 66°F | 4.68 | 0.0 |
| Dwight | 84°F | 62°F | 3.90 | 0.0 |
| Morrison | 83°F | 62°F | 4.16 | 0.0 |
| Fulton | 84°F | 65°F | 3.40 | – |
| Aledo | 85°F | 63°F | 3.86 | 0.0 |
| Gibson City | 84°F | 64°F | 3.57 | 0.0 |
| Carlyle | 88°F | 68°F | 4.24 | – |
| Galena | 82°F | 62°F | 4.93 | 0.0 |
| Virden | 87°F | 68°F | 3.46 | 0.0 |
| Nashville | 87°F | 67°F | 3.83 | 0.0 |
| Rushville | 85°F | 65°F | 4.03 | – |
| Knoxville | 84°F | 65°F | 4.16 | 0.0 |
| Havana | 88°F | 65°F | 4.18 | 0.0 |
| Newton | 86°F | 67°F | 4.23 | 0.0 |
| McLeansboro | 89°F | 66°F | 3.47 | 0.0 |
| Galva | 84°F | 63°F | 3.63 | – |
| Casey | 88°F | 66°F | 4.64 | 0.0 |
| Polo | 85°F | 62°F | 4.40 | – |
| White Hall | 86°F | 66°F | 3.87 | 0.0 |
| Petersburg | 86°F | 65°F | 3.87 | 0.0 |
| Mason City | 85°F | 65°F | 5.14 | 0.0 |
| Athens | 85°F | 64°F | 3.71 | – |
| Minonk | 86°F | 64°F | 3.82 | 0.0 |
| Albion | 89°F | 69°F | – | – |
| Lacon | 87°F | 65°F | 3.97 | 0.0 |
| Princeville | 86°F | 63°F | 4.48 | 0.0 |
| Chenoa | 84°F | 63°F | 3.74 | 0.0 |
| Stockton | 82°F | 61°F | 4.50 | 0.0 |
| Cairo | 89°F | 70°F | 4.10 | – |
| Winchester | 87°F | 65°F | 3.97 | – |
| Grayville | 89°F | 68°F | 5.28 | 0.0 |
| Mount Carroll | 85°F | 60°F | 4.89 | 0.0 |
| Neoga | 87°F | 65°F | 4.48 | – |
| Walnut | 83°F | 63°F | 3.94 | 0.0 |
| Palestine | 87°F | 66°F | 4.23 | 0.0 |
| La Harpe | 85°F | 65°F | 4.23 | – |
| Windsor | 85°F | 65°F | 3.91 | 0.0 |
| Morrisonville | 86°F | 66°F | 2.95 | 0.0 |
| Rosiclare | 86°F | 65°F | 4.40 | 0.0 |
| Ramsey | 85°F | 65°F | 4.06 | 0.0 |
| Shabbona | 82°F | 61°F | 3.77 | – |
| Paw Paw | 82°F | 62°F | 3.90 | 0.0 |
| Hennepin | 85°F | 65°F | 3.89 | – |
| Piper City | 88°F | 63°F | 4.90 | 0.0 |
| Ogden | 84°F | 65°F | 4.39 | 0.0 |
| Brookport | 89°F | 68°F | 3.85 | 0.0 |
| Elizabeth | 83°F | 61°F | 4.65 | 0.0 |
| Brownstown | 87°F | 67°F | 3.74 | – |
| Avon | 84°F | 62°F | 4.23 | 0.0 |
| Golden | 87°F | 65°F | – | – |
| New Boston | 86°F | 65°F | 3.52 | – |
| Congerville | 86°F | 65°F | 3.86 | 0.0 |
| Sidell | 84°F | 64°F | 4.72 | 0.0 |
| Altona | 83°F | 62°F | 3.98 | – |
| Prairie City | 86°F | 64°F | 4.10 | 0.0 |
| Perry | 87°F | 65°F | 4.48 | 0.0 |
| Compton | 83°F | 61°F | – | – |
| Gladstone | 86°F | 67°F | 4.03 | 0.0 |
| Bentley | 86°F | 67°F | 4.29 | 0.0 |
| Kaskaskia | 89°F | 68°F | 4.13 | 0.0 |
| Illinois City | 85°F | 65°F | 4.03 | – |
| Cahokia | 89°F | 69°F | 5.02 | 0.0 |
| Chicago Aurora Municipal Airport | 84°F | 62°F | 3.71 | – |
| Chicago Botanic Garden | 84°F | 63°F | 3.74 | 0.0 |
| Chicago Midway Airport | 85°F | 68°F | 3.55 | – |
| Chicago Waukegan Regional Airport | 81°F | 62°F | 3.48 | – |
| Dixon Springs Agricultural Center | 88°F | 67°F | 4.39 | 0.0 |
| Grand Chain Dam 53 | 89°F | 69°F | 3.28 | 0.0 |
| Iuka (12 mi SW) | 88°F | 66°F | 3.85 | 0.0 |
| Little Red School House | 90°F | 64°F | 4.10 | – |
| McHenry W.G. Stratton Lock and Dam | 84°F | 62°F | 3.80 | 0.0 |
| Rend Lake Dam | 88°F | 68°F | 3.96 | – |
| Smithland Lock and Dam | 88°F | 69°F | 4.26 | 0.0 |
Source: NOAA NCEI nClimDiv statewide normals; NOAA NCEI 1991-2020 monthly normals for each station.