Historical weather data, all-time temperature records, and monthly climate averages for Clayton, CA. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
Today's date has a weather story worth knowing in Clayton. Dig into the historical data below to see how conditions here have played out on this exact date over the past three decades.
Clayton has seen genuine extremes over its recorded history. The mercury has climbed as high as 110° — a punishing September 2022 heat event — and dropped to a bone-chilling 23° back in December 1998.
Clayton runs warm and dry through summer, with highs hovering around 82° from July into August before cooling gradually through fall. Winters are mild, with January highs averaging just 53°. Precipitation is concentrated in the winter months, though even the wettest weeks tend to stay modest.