Historical weather data, all-time temperature records, and monthly climate averages for Barstow, CA. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 4th in Barstow is about as close to pleasant as the desert gets, with average highs of 75° and lows around 47°. The date has swung hard in both directions though — hitting 90° back in 2000 and dipping to a frosty 34° as recently as 2023. Rain is essentially a non-event, with just a 2% chance of any precipitation.
Barstow plays for keeps on the extremes: the thermometer hit a brutal 120° on July 23, 1996, and plunged to 8° on December 22, 1990 — a 112-degree range that tells you everything about the Mojave. Even the precipitation records are dramatic, with a rare 2.25 inches falling in a single September day in 1997 and 6.5 inches of snow blanketing the desert on December 17, 2008.
Barstow bakes hard from June through September, peaking in mid-July with average highs of 103° — not a time for the faint of heart or the unprepared. The most comfortable window for a visit is March through April or October through November, when highs settle into the 70s and 80s. If you're chasing the least-dry stretch, aim for early January, though even then you're looking at just a quarter-inch of rain per week.