Portola Valley, California
Monthly Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
January 36° 60° 20° (1976) 75° (1984) 6.16" NA
February 39° 64° 17° (1989) 84° (1995) 5.79" NA
March 41° 67° 28° (1976) 91° (2004) 4.57" NA
April 42° 73° 30° (1976) 99° (1996) 1.64" NA
May 45° 78° 33° (1986) 105° (2001) 0.64" NA
June 48° 84° 36° (1982) 108° (1995) 0.13" NA
July 51° 88° 35° (1981) 114° (2006) 0.04" NA
August 51° 88° 38° (1987) 110° (1993) 0.14" NA
September 49° 85° 38° (1987) 108° (2000) 0.26" NA
October 45° 79° 30° (2007) 106° (1996) 1.27" NA
November 40° 66° 23° (1987) 90° (1997) 3.86" NA
December 36° 60° 22° (1985) 76° (1988) 4.21" NA
Daily Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
Sep 1 50° 87° 43° (1973) 105° (2002) 0" NA
Sep 2 50° 87° 42° (1991) 105° (2002) 0" NA
Sep 3 50° 87° 41° (2004) 101° (2007) 0" NA
Sep 4 50° 87° 42° (1987) 100° (1975) 0" NA
Sep 5 50° 87° 42° (1981) 102° (2004) 0.01" NA
Sep 6 50° 87° 44° (2000) 104° (2004) 0.01" NA
Sep 7 50° 87° 42° (1989) 105° (2004) 0.01" NA
Sep 8 50° 86° 42° (1987) 105° (2004) 0.01" NA
Sep 9 50° 86° 45° (2002) 101° (1984) 0.01" NA
Sep 10 50° 86° 41° (1986) 101° (2002) 0.01" NA
Sep 11 50° 86° 41° (1987) 103° (1983) 0.01" NA
Sep 12 50° 86° 42° (1977) 106° (1983) 0.01" NA
Sep 13 50° 86° 43° (1994) 105° (2003) 0.01" NA
Sep 14 50° 86° 43° (1985) 102° (2003) 0.01" NA
Sep 15 50° 86° 39° (1992) 98° (1994) 0.01" NA
Sep 16 49° 85° 41° (1987) 99° (1994) 0.01" NA
Sep 17 49° 85° 43° (1993) 100° (2000) 0.01" NA
Sep 18 49° 85° 41° (1978) 104° (2000) 0.01" NA
Sep 19 49° 85° 41° (1989) 108° (2000) 0.01" NA
Sep 20 49° 85° 40° (1978) 103° (2003) 0.01" NA
Sep 21 49° 85° 40° (1985) 106° (2003) 0.01" NA
Sep 22 49° 85° 41° (1977) 106° (2003) 0.01" NA
Sep 23 49° 84° 43° (1981) 102° (1997) 0.01" NA
Sep 24 49° 84° 41° (1993) 101° (1978) 0.01" NA
Sep 25 48° 84° 41° (1984) 99° (1997) 0.01" NA
Sep 26 48° 84° 40° (1987) 101° (1999) 0.01" NA
Sep 27 48° 84° 38° (1987) 101° (1999) 0.01" NA
Sep 28 48° 84° 41° (1986) 100° (1999) 0.01" NA
Sep 29 48° 83° 42° (1986) 100° (1999) 0.01" NA
Sep 30 48° 83° 42° (1981) 102° (2001) 0.01" NA
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