Palo Alto (CA) Weather and Climate: A Comprehensive Guide
Palo Alto experiences great temperature shifts.
The city's weather can transition from warm days
to mild weather.
It maintains relatively low levels of precipitation throughout the seasons.
Let’s explore the climate details in depth to provide you with a complete overview.
Average maximum day and minimum night temperature
The climate in Palo Alto is known for significant temperature differences throughout the year, making the weather dynamic. On average, daytime temperatures range from a comfortable 26°C in September to a moderate 15°C in December.
Nighttime temperatures can drop, with average lows reaching 5°C in December. Check out our detailed temperature page for more information.Temperature ranges by month
Precipitation and rainy days
Palo Alto maintains relatively dry conditions year-round, recording average annual precipitation of 351 mm. The seasons in Palo Alto, bring significant changes in precipitation. The wettest month, December, receives moderate rainfall, with an average of 83 mm of precipitation. This rainfall is distributed across 12 rainy days. In contrast, the driest month, July, experiences much less rainfall, totaling 0 mm over 0 rainy days. These distinct seasonal differences provide diverse experiences throughout the year. For more details, please visit our Palo Alto Precipitation page.The mean monthly precipitation over the year, including rain, hail and snow
The average number of days each month with precipitation
Sunshine over the year
In Palo Alto, summer days are longer and more sunny, with daily sunshine hours peaking at 10.8 hours in May. As the darker season arrives, the brightness of the sun becomes less. December sees a soft sun for only 5.3 hours per average day. Visit our detailed sunshine hours page for more information.Monthly hours of sunshine
Daily hours of sunshine
Daily percentage of sunshine
Average humidity
The relative humidity is high throughout the year in Palo Alto.
The city experiences its highest humidity in January, reaching 80%. In June, the humidity drops to its lowest level at 71%. Explore our detailed page on humidity levels for further details.
Relative humidity over the year
broken clouds and no rain broken clouds and slight rain broken clouds and rainForecast for Palo Alto (CA)
3 m/s
4 m/s
2 m/s
The best time of year to visit Palo Alto in the United States of America
During the months of April, May, June, August and October you are most likely to experience good weather with pleasant average temperatures that fall between 20°C and 26°C.Other facts from our historical weather data:
The hottest season / summer takes place in June, July, August and September.
Yes, the months of May, June, July, August, September and October are very dry.
September has an average maximum temperature of 26°C and is the warmest month of the year.
The coldest month is December with an average maximum temperature of 15°C.
December tops the wettest month list with 83 mm of rainfall.
July is the driest month with 0 mm of precipitation.
May is the sunniest month with an average of 324 hours of sunshine.
No idea where to travel to this year? We have a tool that recommends destinations based on your ideal conditions. Find out where to go with our weather planner.
