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September Normals for Joliet, IL

< August October > Day Temperatures (°F) Precipitation (in) Degree Days Min Max Avg Heating Cooling 1 58 82 70 0.14 0 6 2 58 82 70 0.13 1 6 3 58 82 70 0.13 1 5 4 57 82 69 0.13 1 5 5 57 81 69 0.13 1 5 6 57 81 69 0.13 1 5 7 56 81 69 0.13 1 4 8 56 81 68 0.12 1 4 9 56 80 68 0.12 1 4 10 55 80 68 0.12 1 4 11 55 80 67 0.12 1 4 12 55 80 67 0.12 1 3 13 54 79 67 0.12 1 3 14 54 79 67 0.11 1 3 15 54 79 66 0.11 2 3 16 53 78 66 0.11 2 3 17 53 78 66 0.11 2 3 18 53 78 65 0.11 2 2 19 52 78 65 0.11 2 2 20 52 77 65 0.11 3 2 21 52 77 64 0.1 3 2 22 51 77 64 0.1 3 2 23 51 76 64 0.1 3 2 24 50 76 63 0.1 3 2 25 50 76 63 0.1 4 2 26 50 75 62 0.1 4 1 27 49 75 62 0.1 4 1 28 49 74 62 0.09 5 1 29 49 74 61 0.09 5 1 30 48 74 61 0.09 5 1 Month 53 78 66 3.38 65 91 Data Controls Monthly: January February March April May June July August September October November December   | Yearly Related Maps Related Links Normal High Temperatures Normal Low Temperatures Normal Mean Temperatures Normal Precipitation - Forecast - Past Weather