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Walnut Creek (CA) Weather and Climate: A Comprehensive Guide

The climate in Walnut Creek is marked by big temperature swings throughout the year. Temperatures range from warm during the warmest months to mild in the cooler months. It typically sees modest rainfall throughout the year. Let's now guide you through the climate details for a complete overview.

Average maximum day and minimum night temperature

In Walnut Creek, temperatures differ significantly between summer and winter months. Average daytime temperatures reach a comfortable 30°C in July. In December, the coolest month of the year, temperatures drop to a moderate 14°C.

At night, you can expect cooler temperatures, with averages dropping to around 4°C during this month. Check out our detailed temperature page for more information.

Temperature ranges by month

Precipitation and rainy days

Walnut Creek tends toward drier weather patterns, receiving approximately 479 mm of rain per year. Walnut Creek can be quite wet during December, receiving approximately 102 mm of precipitation over 13 rainy days.

In contrast August, experiences much drier conditions, with 0.1 mm of rainfall, spread across 0 rainy days. For more details, please visit our Walnut Creek Precipitation page.

The mean monthly precipitation over the year, including rain, hail and snow

Sunshine over the year

Walnut Creek can be enjoyed more throughout the sunniest month of May under a blue sky, with approximately 10.8 hours of sunshine daily. In contrast, the city experiences much darker days in December, with only 5.3 hours of sunlight per day. Visit our detailed sunshine hours page for more information.

Monthly hours of sunshine

Data from: San Francisco, the United States of America (42 KM, 26 Miles).

Daily hours of sunshine

Data from: San Francisco, the United States of America (42 KM, 26 Miles).

Forecast for Walnut Creek (CA)

Fri   Dec 27
17°C | 12°C
SW 5 m/s
1.7 mm
broken clouds and slight rain

broken clouds and slight rain

Sat   Dec 28
17°C | 12°C
SW 4 m/s
0.6 mm
overcast and  chance of slight rain

overcast and chance of slight rain

Sun   Dec 29
16°C | 8°C
S 6 m/s
9.5 mm
partly cloudy and rain

partly cloudy and rain

The best time of year to visit Walnut Creek in the United States of America

During the months of April, May 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:
  • Does Walnut Creek have a dry season?
    Yes, the months of May, June, July, August and September are very dry.
  • Which is the warmest month in Walnut Creek?
    July has an average maximum temperature of 30°C and is the warmest month of the year.
  • Which is the coldest month in Walnut Creek?
    The coldest month is December with an average maximum temperature of 14°C.
  • Which is the wettest month in Walnut Creek?
    December tops the wettest month list with 102 mm of rainfall.
  • Which is the driest month in Walnut Creek?
    August is the driest month with 0 mm of precipitation.
  • Which is the sunniest month in Walnut Creek?
    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.