Historical weather data, all-time temperature records, and monthly climate averages for San Gabriel, CA. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 5th in San Gabriel typically lands in comfortable spring territory, with average highs of 73° and lows near 49°. But the date has a wild range in the record books — it's reached as high as 101° (1989) and dipped to a near-freezing 33° (1921). There's a modest 23% chance of rain today, a reminder that spring showers aren't out of the question yet.
San Gabriel sits in the San Gabriel Valley, where the surrounding terrain has a talent for amplifying heat — that 115° reading on September 6, 2020 is a testament to just how punishing late-summer heat events can get here. On the other end, the valley has dipped to 21° (1913) and even pulled off 3 inches of snow in January 1949, proving this sunny SoCal city has more range than its reputation suggests.
San Gabriel is warm and sunny nearly year-round, with highs ranging from a mild 67° in January to a peak of 90° in late July and early August — the hottest stretch of the year. If you're heat-sensitive, stick to the spring window from March through May, when highs hover in the 70s. Rain is rare but concentrated in winter and early spring, with late February being the wettest stretch, averaging just over an inch for the week.