Historical weather data, all-time temperature records, and monthly climate averages for Upland, CA. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
Today's date has a story in Upland's 40-year record book — a city that sits at the foot of the San Gabriel Mountains and feels every swing the Inland Empire can throw. Highs here range from the low 60s in the dead of winter to the upper 80s at summer's peak, so where today lands tells you a lot about what to expect.
Upland has seen genuine extremes: a scorching 109° in July 2006 and a bone-chilling 19° back in March 1986. That 90-degree spread is a reminder that this isn't the mild coast — it's the Inland Empire, where heat events hit hard and the occasional hard freeze is part of the history.
Summer is the main event here, with average highs climbing to 89° in August and staying in the mid-80s through September. Winter is mild but real, with December and January highs settling in the low 60s. Rainfall is concentrated in winter — if you're visiting for sunshine, April through October is your window.