Historical weather data, all-time temperature records, and monthly climate averages for Diamond Springs, CA. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
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Diamond Springs runs hot and hard — the all-time high hit a scorching 117° on September 6, 2022, a reminder that early fall can be just as brutal as midsummer in the Sierra Nevada foothills. On the other end, a 13° freeze on December 21, 1990 marks the coldest the town has ever gotten, a spread of 104 degrees between the extremes.
Diamond Springs is firmly summer-dominant country, with July highs averaging 96° and a peak stretch from July 23–29 hitting 97°. Winters are mild but genuinely cool, with December highs hovering around 55–56° and the coldest week of the year landing right around the winter solstice. The wet season runs January through April, making spring the best window for comfortable outdoor visits before the heat takes over.