Fort Collins Climate by Month
Fort Collins, Colorado, United States
Hot summers and cold winters, with little rain.
The climate in Fort Collins is one of hot summers and cold winters, with little rain. July is the warmest month, with highs around 88°F (31°C); December is the coolest at 44°F (6°C), and nights dip to 16°F (-9°C). It gets only 14 in (345 mm) of rain a year. December to February are almost completely dry.
- Warmest month
- 88°F(31°C)
- Average high, July
- Coldest nights
- 16°F(-9°C)
- Average low, January
- Rain per year
- 14 in(345 mm)
- No clear rainy season
- Humidity
- 48%
- Sunniest: July
Best and worst months in Fort Collins
Best for weatherSeptember is the best time for weather in Fort Collins: highs near 78°F (25°C) and about 1.2 in (31 mm) of rain a month.
Least pleasantDecember and January are the least pleasant; December is the coldest, with highs of only 44°F (6°C).
Comfort combines how close the afternoon high is to 75°F (24°C) with how much rain falls and how humid it is. See where the weather is best in September.
Temperature and rain through the year
Highs and lows (°F)
Average highAverage low
Rain (in per month)
Fort Collins weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 44°F(7°C) | 16°F(-9°C) | 0.3 in(8 mm) | 53% | 2.3 |
| FebFebruary | 46°F(8°C) | 18°F(-8°C) | 0.3 in(8 mm) | 49% | 3.2 |
| MarMarch | 55°F(13°C) | 26°F(-3°C) | 1.1 in(29 mm) | 46% | 4.5 |
| AprApril | 62°F(17°C) | 34°F(1°C) | 1.7 in(44 mm) | 44% | 5.2 |
| MayMay | 71°F(22°C) | 43°F(6°C) | 2.4 in(60 mm) | 51% | 6.2 |
| JunJune | 82°F(28°C) | 52°F(11°C) | 1.7 in(43 mm) | 45% | 6.9 |
| JulJuly | 88°F(31°C) | 57°F(14°C) | 1.7 in(43 mm) | 44% | 7.0 |
| AugAugust | 85°F(30°C) | 55°F(13°C) | 1.2 in(30 mm) | 44% | 6.0 |
| SepSeptemberBest | 78°F(25°C) | 46°F(8°C) | 1.2 in(31 mm) | 47% | 5.1 |
| OctOctober | 64°F(18°C) | 35°F(2°C) | 0.9 in(24 mm) | 50% | 3.5 |
| NovNovember | 52°F(11°C) | 24°F(-4°C) | 0.6 in(16 mm) | 52% | 2.5 |
| DecDecember | 44°F(6°C) | 17°F(-9°C) | 0.4 in(9 mm) | 53% | 2.1 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
Places with a similar climate
All 20 places like Fort Collins →- 🇺🇸Colorado SpringsColorado, United States · Pop. 457k98%matchSame winter lowsSame summer highsFort Collins vs Colorado Springs →
- 🇺🇸AuroraColorado, United States · Pop. 359k97%matchSame summer highsSimilar rainfallFort Collins vs Aurora →
- 🇺🇸BillingsMontana, United States · Pop. 117k88%matchSame winter lowsSame summer highsFort Collins vs Billings →
- 🇺🇸CasperWyoming, United States · Pop. 60k85%matchSame summer highsSame winter lowsFort Collins vs Casper →
- 🇺🇸Rapid CitySouth Dakota, United States · Pop. 74k84%matchSame summer highsLess sunFort Collins vs Rapid City →