Climate averages 1991–2020
Fort Collins weather
in August.
A hot, fairly dry month: the 2nd warmest and the 5th driest of the year. Meets the pleasant-weather rule
Long-term climate patterns, not a forecast for a particular trip.
August is a hot month in Fort Collins: daytime highs average 28.2°C and nights cool to about 14.0°C. By daytime temperature it is the 2nd warmest of the 12 months.
Expect about 37 mm of rain on roughly 7 days, which makes August a fairly dry month (the 5th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 13 h 47 min on an average August day.
The nearest other city in this atlas is Loveland (21 km away). In August its highs average 28.2°C, about as warm as Fort Collins, with 37 mm of rain.
Among the 498 cities listed in the United States, Fort Collins ranks joint 313th of 498 for the warmest August highs and joint 164th of 498 for the driest August (rainfall, lowest first). The mean August high of those 498 cities is 29.9°C; Fort Collins is 1.7°C cooler than that mean.
From August to September, average highs fall by 4.3°C to 23.8°C, and monthly rainfall rises from 37 mm to 39 mm.
The annual picture
August in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Fort Collins climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 4.6°C-8.2°C | -8.2°C | 16 | 4.0 | 9.610 h |
| February | 5.7°C-7.5°C | -7.5°C | 18 | 4.9 | 10.611 h |
| March | 10.7°C-4.1°C | -4.1°C | 38 | 6.9 | 11.912 h |
| April | 14.5°C0.3°C | 0.3°C | 64 | 9.6 | 13.313 h |
| May | 19.5°C5.6°C | 5.6°C | 87 | 11.6 | 14.414 h |
| June | 25.6°C11.1°C | 11.1°C | 54 | 8.6 | 15.015 h |
| July | 29.3°C14.7°C | 14.7°C | 44 | 7.6 | 14.815 h |
| August, selected | 28.2°C14.0°C | 14.0°C | 37 | 6.6 | 13.814 h |
| September | 23.8°C9.6°C | 9.6°C | 39 | 5.8 | 12.513 h |
| October | 16.3°C2.9°C | 2.9°C | 40 | 6.9 | 11.211 h |
| November | 9.1°C-3.7°C | -3.7°C | 26 | 5.3 | 10.010 h |
| December | 4.2°C-7.8°C | -7.8°C | 16 | 3.8 | 9.39 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
August in nearby cities
- Loveland in AugustUnited States · 21 kmHigh 28.2°C · Low 14.0°C · 37 mm rain
- Greeley in AugustUnited States · 36 kmHigh 30.5°C · Low 16.0°C · 31 mm rain
- Longmont in AugustUnited States · 47 kmHigh 28.3°C · Low 14.3°C · 39 mm rain
- Boulder in AugustUnited States · 65 kmHigh 27.5°C · Low 13.7°C · 71 mm rain
- Thornton in AugustUnited States · 80 kmHigh 28.0°C · Low 13.8°C · 39 mm rain
- Westminster (Colorado), United States in AugustUnited States · 83 kmHigh 28.1°C · Low 13.8°C · 39 mm rain
- Arvada in AugustUnited States · 87 kmHigh 28.0°C · Low 13.7°C · 39 mm rain
- Denver in AugustUnited States · 94 kmHigh 28.2°C · Low 13.9°C · 39 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Fort Collins) is explained once on the Fort Collins year overview and on the Sources, method and limits page.
Loveland lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.