Fort Collins averages 26.4 days a year above 90°F, with May the wettest month at 2.72 in of normal rain. The hottest day on record was 103°F on Jul 21, 2005; the coldest, −28°F on Jan 18, 1984. The single biggest 24-hour rain event recorded was 4.63 in on Jul 29, 1997.
Climate and Average Weather Year Round in Fort Collins
Year-round temperature
In Fort Collins, the warmest months are June through September, with average daily highs between 77°F and 87°F. The coldest stretch runs December through February, with highs between 44°F and 47°F and overnight lows reaching 18°F.
Rainfall through the year
Rainfall in Fort Collins averages 1.3 in per month over the long run. May is the wettest at 2.7 in, while January is the driest at 0.4 in.
Days at 90 °F or hotter
Fort Collins averages 26.4 days per year at 90 °F or hotter. The hottest year on record saw 57 such days (2012); the coolest just 2 (2026).
Precipitation this year
As of May 29, Fort Collins has received 4.6 in of precipitation this year — 32% below the long-term normal for this point in the year (6.8 in).