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Fort Collins, CO Weather by Month and Climate Averages
Monthly normals · Rain · Snow
Sunshine · Freeze dates · Records · Best time to visit
What is the weather like in Fort Collins, CO?
Fort Collins, CO gets 15.9 in of precipitation a year over about 86 rainy days, and about 51.4 in of snow a season. July is the warmest month (average high 87°F) and January the coldest (average low 18°F).
Semi-arid climate
Fort Collins, CO has hot summers and chilly winters. Daytime highs range from about 44°F in December to 87°F in July. May is usually the wettest month, and snow falls in winter. The most comfortable time to visit is typically April and September to October, when daytime highs sit near 68°F.
| Season | Months | Avg low | Avg high |
|---|---|---|---|
| Winter | Dec–Feb | 19° | 45° |
| Spring | Mar–May | 36° | 63° |
| Summer | Jun–Aug | 56° | 85° |
| Autumn | Sep–Nov | 37° | 65° |
How much rain does Fort Collins get?
Fort Collins gets 15.9 in of precipitation in an average year, spread over about 86 days with measurable rain. That is fewer rainy days than 52% of the US.
May is the wettest month, with 2.7 in. January is the driest, with 0.4 in. May has the most rainy days, about 12.
The longest dry spell in the last five years lasted 40 days, to January 6, 2025.
From September 2025 to August 2026 Fort Collins got 10.7 in of rain, against a normal of 15.9 in for those months. May 2026 had the most, with 4.3 in.
See where Fort Collins ranks: rainiest cities in the US, US cities with the most rainy days, rainiest cities in Colorado.
Does it snow in Fort Collins?
Yes. Fort Collins gets about 51.4 in of snow in an average season, measured at the reporting station.
The snowiest winter on record is 1979–80, with 114.1 in.
The most recent measurable snow at the station fell on May 6, 2026.
From September 2025 to August 2026 the station measured 22.1 in of snow, against a normal of 51.4 in for those months. December 2025 had the most, with 6.8 in.
See where Fort Collins ranks: snowiest cities in the US.
Fort Collins weather by month
Fort Collins weather in January
In January, Fort Collins averages a high of 45°F and a low of 18°F. It gets 0.4 in of precipitation over about 4 rainy days. Estimated sunshine is 50% of daylight hours, derived from ERA5 cloud cover. The January record high is 75°F (2015) and the record low is -28°F (1984).
Fort Collins weather in February
In February, Fort Collins averages a high of 47°F and a low of 21°F. It gets 0.5 in of precipitation over about 5 rainy days. Estimated sunshine is 54% of daylight hours, derived from ERA5 cloud cover. The February record high is 77°F (2017) and the record low is -19°F (1989).
Fort Collins weather in March
In March, Fort Collins averages a high of 56°F and a low of 29°F. It gets 1.3 in of precipitation over about 6 rainy days. Estimated sunshine is 49% of daylight hours, derived from ERA5 cloud cover. The March record high is 91°F (2026) and the record low is -9°F (2019).
Fort Collins weather in April
In April, Fort Collins averages a high of 62°F and a low of 35°F. It gets 2.1 in of precipitation over about 9 rainy days. Estimated sunshine is 53% of daylight hours, derived from ERA5 cloud cover. The April record high is 89°F (1992) and the record low is -5°F (1975). April is one of the most comfortable months to visit.
Fort Collins weather in May
In May, Fort Collins averages a high of 71°F and a low of 44°F. It gets 2.7 in of precipitation over about 12 rainy days. Estimated sunshine is 46% of daylight hours, derived from ERA5 cloud cover. The May record high is 97°F (2000) and the record low is 17°F (2013).
Fort Collins weather in June
In June, Fort Collins averages a high of 82°F and a low of 53°F. It gets 1.9 in of precipitation over about 9 rainy days. Estimated sunshine is 53% of daylight hours, derived from ERA5 cloud cover. The June record high is 102°F (2012) and the record low is 34°F (1998).
Fort Collins weather in July
In July, Fort Collins averages a high of 87°F and a low of 59°F. It gets 1.6 in of precipitation over about 9 rainy days. Estimated sunshine is 60% of daylight hours, derived from ERA5 cloud cover. The July record high is 103°F (2005) and the record low is 43°F (1972).
Fort Collins weather in August
In August, Fort Collins averages a high of 85°F and a low of 56°F. It gets 1.4 in of precipitation over about 9 rainy days. Estimated sunshine is 61% of daylight hours, derived from ERA5 cloud cover. The August record high is 102°F (2026) and the record low is 39°F (1992).
Fort Collins weather in September
In September, Fort Collins averages a high of 77°F and a low of 48°F. It gets 1.4 in of precipitation over about 7 rainy days. Estimated sunshine is 70% of daylight hours, derived from ERA5 cloud cover. The September record high is 99°F (2019) and the record low is 18°F (1985). September is one of the most comfortable months to visit.
Fort Collins weather in October
In October, Fort Collins averages a high of 65°F and a low of 36°F. It gets 1.3 in of precipitation over about 6 rainy days. Estimated sunshine is 67% of daylight hours, derived from ERA5 cloud cover. The October record high is 88°F (2024) and the record low is -3°F (2020). October is one of the most comfortable months to visit.
Fort Collins weather in November
In November, Fort Collins averages a high of 52°F and a low of 26°F. It gets 0.7 in of precipitation over about 5 rainy days. Estimated sunshine is 62% of daylight hours, derived from ERA5 cloud cover. The November record high is 81°F (2006) and the record low is -7°F (1993).
Fort Collins weather in December
In December, Fort Collins averages a high of 44°F and a low of 18°F. It gets 0.5 in of precipitation over about 4 rainy days. Estimated sunshine is 59% of daylight hours, derived from ERA5 cloud cover. The December record high is 75°F (2025) and the record low is -24°F (1990).
Sunshine, humidity and wind in Fort Collins
September is the sunniest month in Fort Collins, with estimated sunshine of 70% of daylight hours from ERA5 cloud cover. May is the cloudiest, at 46%. The annual cloud-cover estimate is 57% of daylight hours; it is not a measurement of sunshine duration. Fort Collins is sunnier than 79% of the US.
Humidity peaks in January at 59% and is lowest in April at 41%.
Wind averages 3 mph over the year, and April is the windiest month at 4 mph.
Fort Collins has about 27 days a year above 90°F. Fort Collins is cooler than 52% of the US.
Thunderstorms occur on about 11 days a year.
See where Fort Collins ranks: sunniest cities in the US, cloudiest cities in the US, hottest cities in the US.
First and last freeze in Fort Collins
The first fall freeze in Fort Collins typically comes around October 7, and the last spring freeze around May 3. That leaves a frost-free growing season of about 157 days.
Fort Collins weather records
These records cover FT COLLINS during 1970–2026. Earlier records or other stations in the city may differ.
The hottest temperature on record at the Fort Collins station is 103°F, on July 21, 2005. The coldest is -28°F, on January 18, 1984.
The wettest day in the available station history brought 4.6 in of precipitation, on July 29, 1997.
35 all-time records have been set at the station since 1970.
The annual mean temperature has changed by +0.7°F per decade since 1970.
The best time to visit Fort Collins
The most comfortable time to visit is typically April and September to October, when daytime highs sit near 68°F.
Winter (December–February) is chilly, with average highs around 45°F and lows near 19°F. Snow is possible.
Spring (March–May) is mild, with average highs around 63°F and lows near 36°F.
Summer (June–August) is hot, with average highs around 85°F and lows near 56°F.
Autumn (September–November) is mild, with average highs around 65°F and lows near 37°F.
Monthly climate
| Month | Average low | Average high | Precip | Rain days | Wind | Humidity | Estimated sunshine | Record high | Record low |
|---|---|---|---|---|---|---|---|---|---|
| January | 18° | 45° | 0.41 in | 4 | 3 mph | 59% | 50% | 75° | -28° |
| February | 21° | 47° | 0.47 in | 5 | 3 mph | 55% | 54% | 77° | -19° |
| March | 29° | 56° | 1.3 in | 6 | 4 mph | 51% | 49% | 91° | -9° |
| April | 35° | 62° | 2.1 in | 9 | 4 mph | 41% | 53% | 89° | -5° |
| May | 44° | 71° | 2.7 in | 12 | 3 mph | 50% | 46% | 97° | 17° |
| June | 53° | 82° | 1.9 in | 9 | 3 mph | 47% | 53% | 102° | 34° |
| July | 59° | 87° | 1.6 in | 9 | 4 mph | 45% | 60% | 103° | 43° |
| August | 56° | 85° | 1.4 in | 9 | 3 mph | 45% | 61% | 102° | 39° |
| September | 48° | 77° | 1.4 in | 7 | 2 mph | 41% | 70% | 99° | 18° |
| October | 36° | 65° | 1.3 in | 6 | 2 mph | 44% | 67% | 88° | -3° |
| November | 26° | 52° | 0.74 in | 5 | 3 mph | 51% | 62% | 81° | -7° |
| December | 18° | 44° | 0.47 in | 4 | 3 mph | 50% | 59% | 75° | -24° |
Station: FT COLLINS, 1 km from the city. Temperature normal baseline: 1991–2020, calculated from available NOAA GHCN-Daily observations. Available station history: 1970–2026; record values refer to this station and period, not the entire city’s history. Precipitation includes rain and the water equivalent of frozen precipitation; snowfall depth is shown separately when available. Sources and methods
From ERA5 reanalysis. Sunshine is estimated from cloud cover.
Fort Collins climate questions
How much rain does Fort Collins get?
Fort Collins gets 15.9 in of precipitation in an average year, over about 86 rainy days.
What is the wettest month in Fort Collins?
May is the wettest month in Fort Collins, with 2.7 in. January is the driest, with 0.4 in.
How many rainy days does Fort Collins have a year?
Fort Collins has about 86 days with measurable rain in an average year. May has the most, about 12.
Does it snow in Fort Collins?
Yes. Fort Collins gets about 51.4 in of snow in an average season. The snowiest winter on record is 1979–80, with 114.1 in.
What is the hottest month in Fort Collins?
July is the warmest month in Fort Collins, with an average high of 87°F.
What is the coldest month in Fort Collins?
January is the coldest month in Fort Collins, with an average low of 18°F.
What is the record high temperature in Fort Collins?
Within the available 1970–2026 station history, the record high at the Fort Collins station is 103°F, set on July 21, 2005. The record low is -28°F, on January 18, 1984.
What is the sunniest month in Fort Collins?
September is the sunniest month in Fort Collins, with estimated sunshine of 70% of daylight hours from ERA5 cloud cover. May is the cloudiest.
When is the first frost in Fort Collins?
The first fall freeze in Fort Collins typically comes around October 7. The last spring freeze is around May 3.
What is the best time to visit Fort Collins?
The most comfortable time to visit is typically April and September to October, when daytime highs sit near 68°F.