Walnut Creek (CA) Temperature by Month
Walnut Creek, California, United States of America has an average annual maximum temperature of 22°C (72°F), ranging from 14°C (57°F) in December to 30°C (86°F) in July. Below you'll find a full monthly breakdown and a comparison with cities worldwide.
Walnut Creek Monthly Temperatures
Visitors to Walnut Creek can expect significant temperature changes throughout the year. Nighttime temperatures also vary widely, ranging from 13°C (55°F) in July to 4°C (39°F) in December.
The chart below illustrates the average maximum day and minimum night temperatures in Walnut Creek by month:
Daily lows are most common between 4 AM and 6 AM. By 3 PM temperatures reach their daily high, driven by peak solar heating. July, the warmest month of the year, receives 313 hours of sunshine.
The chart below shows the average temperature throughout the year:
Temperature: Walnut Creek vs the United States of America
The map below shows the annual temperature across the United States of America. You can also select individual months if you want to compare a specific time of year.
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Walnut Creek vs World: Temperature Compared
Walnut Creek's average annual maximum temperature is 22°C (72°F). To put that in context, here's how it compares to a few well-known destinations:
Barcelona, Spain has an annual average of around 21°C (70°F), with warm summers and mild, fairly short winters.
Queenstown, New Zealand averages 10°C (50°F) annually — remember seasons are flipped, so its coldest months fall in June and July.
Buenos Aires, Argentina averages 23°C (73°F) a year, with hot summers and mild winters — and seasons reversed compared to Europe.
Melbourne, Australia averages 20°C (68°F) annually — known for unpredictable weather, with four seasons sometimes happening in one day.
What Does the Temperature Feel Like in Walnut Creek?
Temperature alone doesn't tell the whole story — humidity plays a big role in how warm or cold it actually feels. High humidity in summer makes the heat feel more intense, particularly once temperatures climb above 25°C. In winter, the same humidity can make cold air feel sharper than the thermometer suggests.
In Walnut Creek, December is the coolest month, with average highs of 14°C (57°F) and humidity around 78% — considered high. In July, the warmest month, temperatures average 30°C (86°F) with 75% humidity — conditions that feel high. For a full picture, see our humidity page.
Climate temperature data is typically calculated as a 30-year average. This smooths out year-to-year variability and gives a more reliable picture of what a place is actually like, rather than what happened in any single unusual year.
The readings come from a range of sources — land-based weather stations, ocean buoys, ships, and satellites. That data is collected by weather services around the world, then pooled, quality-checked, and averaged to produce the climate records you see here.
Seasonal temperature shifts influence more than just how warm it feels — they also drive changes in rainfall, cloud cover, and wind patterns throughout the year.
Warmer air holds more moisture, which tends to mean heavier or more frequent rain during the warmer months. When temperatures drop in winter, any precipitation that does fall is more likely to come as snow or sleet, though in Walnut Creek this rarely lasts long on the ground.
For more on Walnut Creek's weather — including monthly rainfall, sunshine hours, and humidity — visit our Walnut Creek climate page.
