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September Normals for Lewiston, ID

< August October > Day Temperatures (°F) Precipitation (in) Degree Days Min Max Avg Heating Cooling 1 48 79 63 0.03 4 3 2 47 79 63 0.03 4 2 3 47 78 63 0.03 5 2 4 47 78 62 0.03 5 2 5 47 78 62 0.03 5 2 6 46 77 62 0.03 5 2 7 46 77 61 0.03 5 2 8 46 76 61 0.03 6 2 9 46 76 61 0.02 6 2 10 45 76 60 0.02 6 2 11 45 75 60 0.03 6 1 12 45 75 60 0.03 7 1 13 45 74 60 0.03 7 1 14 44 74 59 0.03 7 1 15 44 74 59 0.03 7 1 16 44 73 59 0.03 7 1 17 44 73 58 0.03 8 1 18 43 73 58 0.03 8 1 19 43 72 58 0.03 8 1 20 43 72 57 0.03 8 1 21 42 71 57 0.03 9 1 22 42 71 57 0.03 9 1 23 42 71 56 0.03 9 1 24 42 70 56 0.03 10 1 25 41 70 56 0.03 10 0 26 41 69 55 0.03 10 0 27 41 69 55 0.03 10 0 28 41 69 55 0.03 11 0 29 40 68 54 0.03 11 0 30 40 68 54 0.03 11 0 Month 44 74 59 0.88 224 35 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