- Fort Collins ›
- Weather by month
Fort Collins Weather by Month
Average temperatures, rainfall and humidity for Fort Collins, United States, month by month, built from OpenWeather's historical records. Use it to see what a typical Fort Collins month looks like before you travel — then check the live Fort Collins forecast for the days ahead.
Warmest month
July
31°C average high
Coolest month
January
-6°C average low
Wettest month
May
117 mm of rain
Driest month
February
5 mm of rain
Average temperature and rainfall in Fort Collins by month
Averages of the daily highs and lows recorded in each month, with total rainfall, mean humidity and mean wind speed.
| Month | Avg high | Avg low | Record low / high | Rainfall | Humidity | Wind |
|---|---|---|---|---|---|---|
| January | 6°C | -6°C | -28°C / 18°C | 11 mm | 62% | 11 km/h |
| February | 8°C | -5°C | -25°C / 23°C | 5 mm | 59% | 13 km/h |
| March | 13°C | -1°C | -23°C / 32°C | 20 mm | 54% | 14 km/h |
| April | 17°C | 2°C | -13°C / 30°C | 31 mm | 52% | 14 km/h |
| May | 21°C | 7°C | -7°C / 32°C | 117 mm | 60% | 13 km/h |
| June | 29°C | 13°C | 4°C / 38°C | 46 mm | 52% | 11 km/h |
| July | 31°C | 16°C | 7°C / 38°C | 43 mm | 52% | 10 km/h |
| August | 30°C | 15°C | 6°C / 39°C | 29 mm | 53% | 10 km/h |
| September | 27°C | 11°C | -3°C / 36°C | 34 mm | 52% | 10 km/h |
| October | 18°C | 4°C | -17°C / 31°C | 20 mm | 55% | 11 km/h |
| November | 12°C | -1°C | -26°C / 26°C | 16 mm | 57% | 12 km/h |
| December | 7°C | -5°C | -26°C / 22°C | 6 mm | 58% | 11 km/h |
Best time to visit Fort Collins
The most comfortable time to visit Fort Collins is generally June and September to October, balancing mild daytime temperatures against the driest stretch of the year. The city has strongly marked seasons and rain concentrates around May, totalling about 376 mm a year.
Travellers who prefer heat should aim for July, when highs average 31°C. May is the month to avoid if rain would spoil your plans — it averages 117 mm, roughly 24× the rainfall of February.
Source: OpenWeather historical and statistical weather data. Values are long-term averages, not a forecast — see the Fort Collins forecast for what is happening now.