Historical weather data, all-time temperature records, and monthly climate averages for Westminster, CO. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 4th in Westminster runs cool, with an average high of 61° and a low that can still dip to freezing at 30°. It's an unpredictable date — the mercury has swung from a balmy 79° in 2005 all the way down to 14° in 1985. There's an 18% chance of snow today, so don't put those layers away just yet.
Westminster's weather has serious range — from a scorching 110° on August 2, 2008 to a bone-chilling -24° on December 22, 1990, that's a 134-degree spread. Summer thunderstorms can unload fast, as proven by the all-time wettest day of 2.45" on August 24, 1992, while a single December storm in 2006 buried the area under 21.8" of snow.
Westminster peaks in the heat the week of July 9–15, when average highs reach 91°, and bottoms out in early January around a mild 45°. Spring is the wet season — late April is the soggiest stretch of the year, averaging 0.66" of precip in a single week. If you're chasing dry and warm, late summer through early fall (August–October) is your sweet spot.