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September Normals for Sisters, OR

< August October > Day Temperatures (°F) Precipitation (in) Degree Days Min Max Avg Heating Cooling 1 41 75 58 0.04 8 -- 2 41 74 58 0.04 8 -- 3 41 74 57 0.04 8 -- 4 40 74 57 0.04 8 -- 5 40 73 57 0.04 9 -- 6 40 73 57 0.05 9 -- 7 40 73 57 0.05 9 0 8 40 73 56 0.05 9 0 9 40 72 56 0.05 9 0 10 39 72 56 0.05 9 0 11 39 72 56 0.05 10 0 12 39 72 55 0.05 10 0 13 39 71 55 0.05 10 0 14 39 71 55 0.06 10 0 15 39 71 55 0.06 11 0 16 38 70 54 0.06 11 0 17 38 70 54 0.06 11 0 18 38 70 54 0.06 11 0 19 38 69 54 0.06 11 0 20 38 69 53 0.06 12 0 21 38 69 53 0.07 12 0 22 37 68 53 0.07 12 0 23 37 68 53 0.07 12 0 24 37 68 53 0.07 13 0 25 37 68 52 0.07 13 0 26 37 67 52 0.07 13 0 27 37 67 52 0.07 13 0 28 36 67 51 0.08 14 0 29 36 66 51 0.08 14 0 30 36 66 51 0.08 14 0 Month 39 70 55 1.75 323 6 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