Historical weather data, all-time temperature records, and monthly climate averages for Rowland Heights, CA. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 5th in Rowland Heights is a mild late-spring day by local standards, with highs averaging 73° and a near-zero chance of snow. That said, the date has seen its share of swings — from a scorching 89° in 2016 down to a chilly 41° low back in 1999. Rain is unlikely but not impossible, showing up about 11% of the time.
Rowland Heights earns its Southern California credentials with a staggering all-time high of 112°, recorded during a brutal heat event on September 6, 2024. On the other end, the thermometer dipped to 30° on January 30, 2002 — rare freezing territory for the area. The wettest single day on record dumped 6.73 inches of rain on January 18, 2010.
Rowland Heights stays mild year-round, with monthly average highs never straying far from 70°–90°. Peak heat arrives in late August through early September, when averages climb to 88–90°, while the coolest stretch comes in late December with highs around 69°. If you're trying to dodge rain, avoid late February — it's the wettest week of the year, averaging nearly an inch of precipitation.