Historical weather data, all-time temperature records, and monthly climate averages for Hacienda Heights, CA. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
Hacienda Heights sits in the San Gabriel Valley foothills, where historical data stretches back to 1993. Pull up any date and you're looking at over three decades of local weather patterns—enough to know what this spot truly does.
The extremes here are real: Hacienda Heights hit a scorching 118° on July 6, 2018, and bottomed out at 29° on January 14, 2013—a 89-degree swing that captures the full range of inland Southern California. Most days fall nowhere near those edges, but they're a reminder this valley plays by its own rules.
Summers run hot, with average highs peaking around 95° in late August and holding strong through September at 92°. Winters are mild but not warm—December highs average just 69°, the coolest stretch of the year. Rain is rare and heavily front-loaded, with the best chance of precipitation concentrated in early January.