September weather in Boone, CO
The average temperature in Boone in September is °F (°F–°F). Average precipitation: 0.90 inches.
September is a fall month in Boone, and is cooler than the annual average of 0°F. Daylight averages about 12h 14m.
Avg High
°F
Avg Low
°F
Precipitation
0.90 in
Daylight
12h 14m
September records in Boone
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | — | — | 0.17 in (2019) |
| September 2 | — | — | 0.01 in (2021) |
| September 3 | — | — | 0.48 in (2022) |
| September 4 | — | — | 0.84 in (2021) |
| September 5 | — | — | 0.00 in (2017) |
| September 6 | — | — | 0.00 in (2017) |
| September 7 | — | — | 0.33 in (2018) |
| September 8 | — | — | 0.40 in (2020) |
| September 9 | — | — | 0.26 in (2020) |
| September 10 | — | — | 0.05 in (2020) |
| September 11 | — | — | 0.00 in (2017) |
| September 12 | — | — | 1.00 in (2023) |
| September 13 | — | — | 0.00 in (2017) |
| September 14 | — | — | 0.05 in (2023) |
| September 15 | — | — | 0.90 in (2023) |
| September 16 | — | — | 0.30 in (2023) |
| September 17 | — | — | 0.00 in (2017) |
| September 18 | — | — | 0.00 in (2017) |
| September 19 | — | — | 0.00 in (2017) |
| September 20 | — | — | 0.00 in (2017) |
| September 21 | — | — | 0.00 in (2017) |
| September 22 | — | — | 0.44 in (2020) |
| September 23 | — | — | 0.03 in (2022) |
| September 24 | — | — | 0.46 in (2017) |
| September 25 | — | — | 0.00 in (2017) |
| September 26 | — | — | 0.25 in (2017) |
| September 27 | — | — | 0.50 in (2017) |
| September 28 | — | — | 0.00 in (2017) |
| September 29 | — | — | 0.32 in (2021) |
| September 30 | — | — | 0.03 in (2021) |