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.
| 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).
| 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.
| 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.