Fullerton (CA) Weather and Climate: A Comprehensive Guide
The weather in Fullerton sees moderate temperature fluctuations over the course of a year.
Temperatures can be very warm at the high end
to roughly pleasant at the low end.
It experiences desert-like conditions in terms of precipitation, with almost no rainfall.
Now, let’s explore all the climate details to give you a full picture.
Average maximum day and minimum night temperature
The weather in Fullerton changes moderately throughout the year, offering enough variation to appreciate each season. Typically, average maximum daytime temperatures range from a very warm 31°C in September to a pleasant 20°C in the coolest month, December.
Nights are cooler, with lows often dropping to around 8°C during the colder months. Check out our detailed temperature page for more information.Temperature ranges by month
Precipitation and rainy days
Fullerton sits in an arid zone with minimal moisture, averaging 242 mm of rainfall per year. The climate in Fullerton shows significant variation throughout the year. Expect moderate rainfall in December, with an average of 67 mm of precipitation over 8 rainy days. In contrast, August offers drier and sunnier days, with around 0.3 mm of rainfall over 0 rainy days. For more details, please visit our Fullerton 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
For those who appreciate different seasons, Fullerton serves as an ideal destination. Expect longer, more sun-filled days in July with an average of 12.3 hours of sunshine daily, and embrace the darker days in January, offering only 6.6 hours of daily sunlight. Visit our detailed sunshine hours page for more information.Monthly hours of sunshine
Daily hours of sunshine
partly cloudy and no rain broken clouds and no rain almost clear and no rainForecast for Fullerton (CA)
2 m/s
2 m/s
2 m/s
The best time of year to visit Fullerton in the United States of America
During the months of January, February, March, April, May, November and December 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:
September has an average maximum temperature of 31°C and is the warmest month of the year.
The coldest month is December with an average maximum temperature of 20°C.
December tops the wettest month list with 67 mm of rainfall.
August is the driest month with 0 mm of precipitation.
July is the sunniest month with an average of 369 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.
