Mercer Island, Washington
Monthly Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
January 37° 47° 18° (1996) 64° (2005) 4.81" 0.4"
February 37° 50° 19° (2006) 66° (1992) 3.43" 0.6"
March 39° 54° 28° (2006) 78° (2004) 3.51" 0"
April 43° 59° 32° (1991) 83° (1987) 2.77" 0"
May 48° 64° 35° (2002) 89° (2005) 2.16" 0"
June 52° 70° 42° (1991) 92° (2002) 1.63" 0"
July 56° 76° 48° (2002) 96° (1994) 0.79" 0"
August 57° 76° 47° (2000) 93° (1990) 0.97" 0"
September 53° 71° 42° (2000) 93° (1988) 1.52" 0"
October 47° 60° 29° (1991) 87° (1987) 3.41" 0"
November 41° 51° 20° (2006) 66° (1997) 5.84" 0.3"
December 36° 46° 10° (1990) 62° (1993) 5.43" 2.3"
Daily Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
Jun 1 51° 67° 46° (1994) 77° (1989) 0.08" 0"
Jun 2 51° 67° 47° (1987) 84° (2009) 0.07" 0"
Jun 3 51° 68° 43° (2002) 86° (2007) 0.07" 0"
Jun 4 51° 68° 42° (1991) 85° (2009) 0.08" 0"
Jun 5 51° 68° 43° (1991) 84° (1989) 0.07" 0"
Jun 6 51° 68° 47° (1995) 85° (2003) 0.07" 0"
Jun 7 51° 68° 44° (2002) 88° (2003) 0.07" 0"
Jun 8 52° 68° 44° (2002) 77° (1995) 0.07" 0"
Jun 9 52° 68° 45° (2008) 84° (1995) 0.07" 0"
Jun 10 52° 69° 45° (2008) 76° (1997) 0.06" 0"
Jun 11 52° 69° 45° (2001) 80° (1989) 0.07" 0"
Jun 12 52° 69° 46° (2001) 79° (2002) 0.05" 0"
Jun 13 52° 69° 48° (1991) 92° (2002) 0.06" 0"
Jun 14 52° 69° 47° (2008) 80° (1988) 0.05" 0"
Jun 15 52° 70° 46° (2008) 77° (1988) 0.05" 0"
Jun 16 52° 70° 46° (2000) 77° (2003) 0.05" 0"
Jun 17 52° 70° 48° (1987) 83° (2003) 0.05" 0"
Jun 18 53° 70° 48° (1991) 85° (2004) 0.05" 0"
Jun 19 53° 70° 46° (1989) 86° (2004) 0.04" 0"
Jun 20 53° 71° 46° (1996) 87° (2004) 0.05" 0"
Jun 21 53° 71° 50° (1991) 85° (1992) 0.04" 0"
Jun 22 53° 71° 47° (2006) 87° (1992) 0.05" 0"
Jun 23 53° 71° 47° (2008) 87° (1992) 0.05" 0"
Jun 24 53° 71° 47° (2008) 87° (1992) 0.04" 0"
Jun 25 53° 72° 50° (1990) 87° (1992) 0.04" 0"
Jun 26 54° 72° 50° (1990) 87° (2002) 0.04" 0"
Jun 27 54° 72° 47° (2009) 89° (2000) 0.04" 0"
Jun 28 54° 72° 50° (1998) 89° (2000) 0.03" 0"
Jun 29 54° 72° 48° (1996) 88° (2008) 0.04" 0"
Jun 30 54° 73° 47° (2009) 92° (1995) 0.03" 0"
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