Walnut Creek, CA Weather & Climate Normals
Walnut Creek's real weather, in one number
Walnut Creek, CA scores 77/100 on this site's reading of NOAA's own 30-year normals: mild with real seasons. A solid stretch of comfortable months alongside a noticeable but not extreme summer or winter. 9 of the year's 12 months average between 55 and 75°F, the range this site counts as mild.
Walnut Creek's hottest and coldest months
Walnut Creek's hottest month is Aug, averaging 74°F; its coldest is Dec, averaging 50°F, a 23.5°F swing across the year, a middling gap by national standards.
Walnut Creek's weather across the year
| Month | Avg high | Avg low | Precip | Snow |
|---|---|---|---|---|
| Jan | 58°F | 42°F | 3.46in | 0in |
| Feb | 63°F | 44°F | 3.57in | 0in |
| Mar | 68°F | 47°F | 2.57in | 0in |
| Apr | 72°F | 49°F | 1.23in | 0in |
| May | 78°F | 53°F | 0.61in | 0in |
| Jun | 85°F | 57°F | 0.12in | 0in |
| Jul | 88°F | 58°F | 0in | 0in |
| Aug | 88°F | 59°F | 0.02in | 0in |
| Sep | 86°F | 58°F | 0.06in | 0in |
| Oct | 78°F | 53°F | 0.68in | 0in |
| Nov | 67°F | 46°F | 1.87in | 0in |
| Dec | 59°F | 41°F | 3.55in | 0in |
most of the year (9 of 12 months) are the best time to see Walnut Creek at its mildest; the rest of the year, plan around Dec's cold.
Rain and snow in Walnut Creek
Walnut Creek averages 17.74in of precipitation a year across roughly 56 days with measurable rain or snow, and 0in of snow a year.
Where Walnut Creek ranks
Walnut Creek ranks 170 of 4876 US cities in this dataset for comfort score, and 170 of 429 within CA. About 70,817 people live there.
If you need tomorrow's forecast, not the 30-year average
Everything above is a 30-year average from Concord Wwtp, CA US, 5.8 miles from Walnut Creek, not a prediction for any specific day.
More on how this is worked out
How the comfort score is calculated · Why some cities show no snow or rain figure