Palo Alto Temperatures: Averages by Month





The numbers here tell you how hot and cold the weather usually is in Palo Alto, California during each month of the year.

The average high and low temperatures are listed below for the Silicon Valley city, in both degrees Fahrenheit and Celsius.

Maximums and minimums are only part of the temperature picture. To fill in the rest, there's information on how many days a month get above or below a given temperature.

To find out how often it rises over 70, 80 or 90 °F monthly and annually in Palo Alto, scroll down farther. There are also counts of nights with cool temperatures.

All the numbers are averages, based on climate data gathered from 1991 to 2020.

Average Palo Alto temperatures
High °F Low °F   High °C Low °C
58 39 January 14 4
61 41 February 16 5
66 44 March 19 6
70 45 April 21 7
73 50 May 23 10
79 53 June 26 12
79 56 July 26 13
79 55 August 26 13
80 53 September 26 12
74 48 October 23 9
64 43 November 18 6
58 39 December 14 4
70 47 Year 21 8

Days of Hot Weather in Palo Alto

Summer days at Palo Alto usually warm up to the 70s or 80s Fahrenheit, as does most of May and October.

Hotter weather occurs sporadically during those months, with 12 days on average reaching 90 degrees and one of those making it to 100 °F (38 °C).

Days per month in Palo Alto of at least 70, 80 or 90 °F
  70 °F
21 °C
80 °F
27 °C
90 °F
32 °C
January 0 0 0
February 3 0 0
March 9 1 0
April 13 4 0
May 22 6 1
June 27 11 3
July 30 13 2
August 30 12 2
September 28 13 4
October 22 7 0
November 5 0 0
December 0 0 0
Year 189 66 12

How Often Palo Alto Has Cool Temperatures

Most nights at Palo Alto never get colder than 40 °F. From November to February, the city averages 14 nights with frost. Even then it always warms up to at least 40 degrees and usually 50 (10 °C) the next day. Temperatures as cold as 20 °F (-8 °C) are not expected here.

Days per month on average in Palo Alto when the minimum temperature drops to at least 32 or 40 °F
  32 °F
0 °C
40 °F
4 °C
January 5 19
February 2 13
March 0 9
April 0 6
May 0 0
June 0 0
July 0 0
August 0 0
September 0 0
October 0 1
November 1 10
December 6 21
Year 14 80
Reference

NOAA National Centers for Environmental Information (NCEI). Climate Normals.

California Temperatures
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