Climate
Walnut Creek weather by month
Average highs, lows, rain and snow for every month, from 30 years of weather records.
Average temperatures
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
Best time to visit: May, June, October, when highs are mild and rain is lightest.
Month by month
| Month | High | Low | Rain | Wet days |
|---|---|---|---|---|
| January | 58°F | 41°F | 3.2 in | 9 |
| February | 62°F | 44°F | 3.2 in | 9 |
| March | 67°F | 47°F | 2.3 in | 9 |
| April | 71°F | 49°F | 1.1 in | 5 |
| May | 78°F | 53°F | 0.50 in | 3 |
| June | 84°F | 57°F | 0.20 in | 1 |
| July | 88°F | 59°F | 0.00 in | 0 |
| August | 88°F | 59°F | 0.00 in | 0 |
| September | 85°F | 58°F | 0.10 in | 1 |
| October | 78°F | 53°F | 0.70 in | 3 |
| November | 66°F | 45°F | 1.6 in | 7 |
| December | 58°F | 41°F | 3.2 in | 10 |
NOAA U.S. Climate Normals 1991–2020, Concord Buchanan Fld, Ca Us (6.2 mi away, 18 ft). Wet days: days with at least 0.01 in of precipitation.
Questions
What is the hottest month in Walnut Creek?
July, with an average high of 88°F and low of 59°F.
What is the coldest month in Walnut Creek?
December, with an average low of 41°F and high of 58°F.
When does it rain most in Walnut Creek?
January is the wettest month, averaging 3.2 in of precipitation; the year totals about 16.1 inches.
What is the best time to visit Walnut Creek?
For mild weather (highs between 65°F and 85°F) with the least rain, May, June, October.
Where do these numbers come from?
NOAA’s 1991–2020 U.S. Climate Normals for the Concord Buchanan Fld weather station, 6.2 miles from downtown: 30-year averages, not a forecast.