Historical weather data, all-time temperature records, and monthly climate averages for Baldwin Park, CA. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
Baldwin Park sits in the San Gabriel Valley, where summer heat builds fast and winter stays mild by most standards. Highs here swing from the upper 60s in December to the mid-90s in late August, a 30-degree seasonal range that defines Southern California's inland edge.
Baldwin Park has seen genuine extremes over the past three decades. The mercury hit a blistering 118° on July 6, 2018 — one of the most punishing heat events in the region's recorded history — and dipped to 29° on January 14, 2013, proving that frost is a real, if rare, visitor to the San Gabriel Valley.
If you're planning around weather, aim for late spring: May's average high of 80° is comfortable before the real heat arrives. July through September pushes into the 90s, peaking during the Aug 27–Sep 2 window at an average high of 97°. Winter is dry and mild, with December and January averaging highs in the upper 60s to low 70s.