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September Normals for Duluth, MN

< August October > Day Temperatures (°F) Precipitation (in) Degree Days Min Max Avg Heating Cooling 1 50 70 60 0.14 7 1 2 49 69 59 0.15 7 1 3 49 69 59 0.15 7 1 4 49 68 59 0.15 8 1 5 48 68 58 0.15 8 1 6 48 68 58 0.15 8 1 7 48 67 58 0.15 8 1 8 47 67 57 0.15 9 1 9 47 67 57 0.15 9 1 10 47 66 57 0.15 9 1 11 46 66 56 0.15 10 1 12 46 66 56 0.15 10 1 13 46 65 55 0.14 10 0 14 45 65 55 0.14 10 0 15 45 65 55 0.14 11 0 16 45 64 54 0.14 11 0 17 44 64 54 0.14 11 0 18 44 64 54 0.14 12 0 19 44 63 53 0.14 12 0 20 43 63 53 0.14 12 0 21 43 63 53 0.13 13 0 22 43 62 52 0.13 13 0 23 42 62 52 0.13 13 0 24 42 62 52 0.13 14 0 25 42 61 52 0.12 14 0 26 41 61 51 0.12 14 0 27 41 61 51 0.12 15 0 28 41 60 51 0.12 15 0 29 40 60 50 0.11 15 0 30 40 59 50 0.11 16 0 Month 45 65 55 4.13 331 12 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