
Isolated severe thunderstorms and widespread showers may produce flash flooding across the Southern Plains through Thursday. Numerous instances of flash flooding are expected in south-central Texas, including portions of the Hill Country; and an additional area across eastern Oklahoma into the Ozarks on Thursday. Heavy rainfall and mountain snow will return to southern California on Thursday. Read More >
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September Normals for Chicago for Temperature and Precipitation
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| Day of Month | High | Low | Average | HDD | CDD | Precipitation |
| 1 | 80.2 | 62.3 | 71.3 | 0.4 | 6.7 | 0.12 |
| 2 | 80 | 62.1 | 71 | 0.5 | 6.5 | 0.12 |
| 3 | 79.7 | 61.8 | 70.7 | 0.5 | 6.3 | 0.11 |
| 4 | 79.5 | 61.5 | 70.5 | 0.6 | 6.1 | 0.12 |
| 5 | 79.2 | 61.1 | 70.2 | 0.7 | 5.8 | 0.12 |
| 6 | 78.9 | 60.8 | 69.9 | 0.8 | 5.6 | 0.11 |
| 7 | 78.6 | 60.5 | 69.5 | 0.9 | 5.5 | 0.11 |
| 8 | 78.3 | 60.1 | 69.2 | 1 | 5.3 | 0.11 |
| 9 | 78 | 59.8 | 68.9 | 1.2 | 5 | 0.1 |
| 10 | 77.7 | 59.4 | 68.6 | 1.3 | 4.8 | 0.1 |
| 11 | 77.4 | 59 | 68.2 | 1.4 | 4.6 | 0.11 |
| 12 | 77 | 58.6 | 67.8 | 1.6 | 4.4 | 0.1 |
| 13 | 76.7 | 58.3 | 67.5 | 1.7 | 4.2 | 0.1 |
| 14 | 76.3 | 57.9 | 67.1 | 1.9 | 4 | 0.1 |
| 15 | 76 | 57.5 | 66.7 | 2.1 | 3.9 | 0.1 |
| 16 | 75.6 | 57.1 | 66.3 | 2.4 | 3.7 | 0.1 |
| 17 | 75.2 | 56.6 | 65.9 | 2.6 | 3.5 | 0.11 |
| 18 | 74.8 | 56.2 | 65.5 | 2.8 | 3.4 | 0.1 |
| 19 | 74.4 | 55.8 | 65.1 | 3 | 3.2 | 0.11 |
| 20 | 74 | 55.4 | 64.7 | 3.2 | 3 | 0.11 |
| 21 | 73.6 | 55 | 64.3 | 3.4 | 2.8 | 0.11 |
| 22 | 73.2 | 54.6 | 63.9 | 3.7 | 2.6 | 0.11 |
| 23 | 72.8 | 54.2 | 63.5 | 3.9 | 2.4 | 0.1 |
| 24 | 72.4 | 53.7 | 63.1 | 4.1 | 2.2 | 0.11 |
| 25 | 72 | 53.3 | 62.6 | 4.4 | 2.1 | 0.11 |
| 26 | 71.5 | 52.9 | 62.2 | 4.7 | 2 | 0.1 |
| 27 | 71.1 | 52.5 | 61.8 | 5.1 | 1.9 | 0.1 |
| 28 | 70.7 | 52.1 | 61.4 | 5.4 | 1.7 | 0.1 |
| 29 | 70.2 | 51.7 | 61 | 5.7 | 1.6 | 0.09 |
| 30 | 69.8 | 51.3 | 60.5 | 6 | 1.5 | 0.1 |
| MONTH | 75.5 | 57.1 | 66.3 | 77 | 116.3 | 3.19 |