Historical weather data, all-time temperature records, and monthly climate averages for Sierra Madre, CA. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 5 in Sierra Madre is typically a mild spring day, with highs averaging 73° and lows around 49°. There's a 23% chance of rain — not unlikely, but not the norm either. The date has seen some wild swings over 120 years, from a scorching 101° in 1989 down to a near-freezing 33° back in 1921.
Sierra Madre sits at the foot of the San Gabriel Mountains, and its weather reflects that — this is a place of genuine extremes. The thermometer has hit 115° as recently as September 2020, yet dipped to 21° in January 1913. A single March day in 1938 dropped 7.7 inches of rain, a reminder that Southern California's wet season can punch hard when it wants to.
Sierra Madre is at its warmest in late July through early August, when average highs reach 90°, and at its mildest in early January around 66° — a narrow range that makes it a year-round destination. If you're avoiding rain, skip late February, which is the wettest stretch of the year averaging over an inch in a single week. Spring and fall offer the sweet spot: warm days, low precip, and highs comfortably in the mid-70s to low 80s.