Historical weather data, all-time temperature records, and monthly climate averages for Chino Hills, CA. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 4th in Chino Hills is a pleasant early-spring day, with highs averaging 74° and lows around 52° over 36 years of records. Rain is rare — just an 8% chance — though the temperature range has been wide, from a chilly 39° low in 1999 to a warm 86° high back in 1991.
Chino Hills runs hot, with an all-time high of 112° set just last September 6, 2024 — a reminder of how punishing the Inland Empire heat can get. On the other end, temperatures have dipped to 30° (January 30, 2002), and a single January storm in 2010 dropped a remarkable 6.73 inches of rain in one day.
Chino Hills stays mild year-round, with monthly highs ranging from 70° in December to a peak of 88° in August — the warmest stretch runs from late summer into early fall, topping out the week of September 3–9 at an average 90°. If you're chasing rain, late February is your best bet, but even then you're only averaging about an inch a week.