Historical weather data, all-time temperature records, and monthly climate averages for Fort Collins, CO. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 4 in Fort Collins has a wild temperature range baked into its history — 131 years of data show an average high of 57° and low of 29°, but this date has swung from a brutal -10° in 1945 all the way to 81° in 2021. There's only a 1-in-10 chance of snow today, though don't put the jacket away just yet.
Fort Collins earns its Front Range reputation: the thermometer has hit 103° in July and plunged to -41° in February, a swing of 144 degrees between the city's all-time extremes. A single November storm dropped 21.1 inches of snow in 1979, and a July thunderstorm dumped 4.63 inches of rain in one day in 1997 — classic Colorado feast-or-famine weather.
Summer is the star here, with average highs peaking at 86° the week of July 9–15, while early January bottoms out around 40°. If you're chasing rain, late May through early June is the wettest stretch, averaging 0.66 inches per week. Spring and fall offer mild shoulder seasons, but expect temperatures to move fast in either direction.