Fort Collins, CO Weather
Fort Collins hourly forecast: next 24 hours
Today's high of 76°F (24°C) is about 4°F (2°C) below the typical September high of 80°F (27°C).
Current conditions in detail
Fort Collins weather tomorrow (Wednesday, September 16)
Tomorrow in Fort Collins looks overcast, with a high of 84° and an overnight low of 56°. Rain is unlikely (11% chance). Winds top out near 8 mph, and the UV index reaches 6 (moderate).
Fort Collins 14-day forecast
About the weather in Fort Collins
Cold is the baseline in Fort Collins, not the exception. Night-time lows sit at or below freezing in 5 months of the year, and the warmest month, July, still only averages 87°F (31°C) by day. January runs to 16°F (-9°C) after dark.
Fort Collins weather: quick facts
- Hottest month: July - highs near 87°F (31°C)
- Coldest month: January - highs near 38°F (4°C)
- Decade extremes (2015-2024): 100°F (38°C) high · -28°F (-33°C) low
- Wettest month: May (13 rainy days) · Sunniest: July (12.9 h sun/day)
- Climate type: semi-arid
- Annual swing: 26°C between the average warmest and coolest month · day to night: 14°C
- Snow: about 23 days a year
- Months averaging 30°C or hotter: 1
- Average humidity: 56%
Temperatures through the year
July is the warm end of the year, averaging 87°F (31°C) by day and 61°F (16°C) overnight. January sits at the other end of the year: 38°F (4°C) by day, 16°F (-9°C) at night. The gridded 2015-2024 daily record for this location tops out at 100°F (38°C) and bottoms at -28°F (-33°C) - decade extremes, not all-time station records. 3 months average under 20 mm of rain, the longest unbroken stretch running December through January.
Rain, sun and snow
Relative humidity averages 56% across the year, drier than all but 10% of the 3496 cities in our dataset. Snow falls on roughly 23 days a year, mostly October through May. Overnight lows average at or below freezing for 5 months, November through March. The wettest month is May (4.1 inches (105 mm) across 13 days) and the driest January.
Season by season
Spring (March through May)
Spring in Fort Collins runs cool rather than cold, with daytime highs averaging 59°F (15°C) and nights around 34°F (1°C); expect showers on roughly 28 days across the season, plus about 8 snowy days. Daylight is generous - around 10.5 hours of sun a day.
Summer (June through August)
Summer brings hot afternoons here - highs near 84°F (29°C), nights near 58°F (15°C), and expect showers on roughly 20 days across the season. Daylight is generous - around 12.6 hours of sun a day.
Fall (September through November)
Through fall, Fort Collins is crisp but comfortable: 65°F (18°C) by day, 40°F (4°C) after dark, and rain comes on about 14 days over the three months, plus about 5 snowy days.
Winter (December through February)
Through winter, Fort Collins is chilly: 40°F (4°C) by day, 18°F (-8°C) after dark, and rain comes on about 13 days over the three months, plus about 10 snowy days.
Average temperatures in Fort Collins by month
| Month | High | Low | Rain days | Precipitation | Sunshine | Humidity |
|---|---|---|---|---|---|---|
| January | 38° | 16° | 4 | 0.6 in | 7.9 h/day | 63% |
| February | 41° | 17° | 5 | 0.9 in | 8.9 h/day | 59% |
| March | 51° | 25° | 6 | 1.6 in | 9.8 h/day | 58% |
| April | 60° | 33° | 8 | 1.9 in | 10.6 h/day | 52% |
| May | 67° | 43° | 13 | 4.1 in | 11.1 h/day | 62% |
| June | 81° | 55° | 8 | 1.8 in | 12.8 h/day | 54% |
| July | 87° | 61° | 6 | 1.3 in | 12.9 h/day | 51% |
| August | 85° | 59° | 6 | 1.0 in | 12.2 h/day | 51% |
| September | 80° | 53° | 4 | 0.7 in | 11.0 h/day | 47% |
| October | 64° | 39° | 5 | 0.9 in | 9.4 h/day | 53% |
| November | 50° | 28° | 5 | 0.8 in | 8.5 h/day | 59% |
| December | 40° | 20° | 4 | 0.6 in | 7.6 h/day | 59% |