Diamond Bar (CA) Weather and Climate: A Comprehensive Guide
Diamond Bar experiences great temperature shifts.
The city's weather can transition from very warm days
to pleasant weather.
It typically sees modest rainfall throughout the year.
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 Diamond Bar is known for significant temperature differences throughout the year, making the weather dynamic. Typically, average maximum daytime temperatures range from a very warm 33°C in August to a pleasant 19°C in the coolest month, December.
Nights are cooler, with lows often dropping to around 7°C during the colder months. Check out our detailed temperature page for more information.Temperature ranges by month
Precipitation and rainy days
Diamond Bar maintains relatively dry conditions year-round, recording average annual precipitation of 312 mm. The climate in Diamond Bar shows significant variation throughout the year. Expect moderate rainfall in December, with an average of 84 mm of precipitation over 9 rainy days. In contrast, June offers drier and sunnier days, with around 0.2 mm of rainfall over 0 rainy days. For more details, please visit our Diamond Bar 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, Diamond Bar 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 Diamond Bar (CA)
3 m/s
3 m/s
4 m/s
The best time of year to visit Diamond Bar in the United States of America
During the months of January, February, March, April, May and November 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:
August has an average maximum temperature of 33°C and is the warmest month of the year.
The coldest month is December with an average maximum temperature of 19°C.
December tops the wettest month list with 84 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.
