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August Normals for Mercer Island, WA

< July September > Day Temperatures (°F) Precipitation (in) Degree Days Min Max Avg Heating Cooling 1 55 74 65 0.04 2 2 2 55 74 65 0.04 2 2 3 55 75 65 0.04 2 2 4 55 75 65 0.04 2 2 5 55 75 65 0.04 2 2 6 55 75 65 0.04 2 2 7 55 75 65 0.04 2 2 8 55 75 65 0.04 2 2 9 55 75 65 0.04 2 2 10 55 74 64 0.04 3 2 11 55 74 64 0.04 3 2 12 54 74 64 0.04 3 2 13 54 74 64 0.04 3 2 14 54 74 64 0.04 3 2 15 54 74 64 0.04 3 2 16 54 74 64 0.04 3 2 17 54 74 64 0.04 3 2 18 54 74 64 0.04 3 2 19 54 74 64 0.04 3 2 20 54 74 64 0.04 3 2 21 54 74 64 0.05 3 2 22 53 74 64 0.05 3 2 23 53 74 63 0.05 3 2 24 53 73 63 0.05 3 2 25 53 73 63 0.05 3 1 26 53 73 63 0.05 4 1 27 53 73 63 0.05 4 1 28 52 73 63 0.05 4 1 29 52 73 62 0.05 4 1 30 52 72 62 0.05 4 1 31 52 72 62 0.05 4 1 Month 54 74 64 1.35 90 55 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