September weather in Grand Junction, CO
The average temperature in Grand Junction in September is 68.5°F (55.0°F–82.0°F). Average precipitation: 1.47 inches.
September is a fall month in Grand Junction, and is warmer than the annual average of 54.6°F. Daily temperatures swing about 27°F between overnight low and afternoon high. Daylight averages about 12h 14m. For travel, September is a comfortable month to visit.
Avg High
82.0°F
Avg Low
55.0°F
Precipitation
1.47 in
Daylight
12h 14m
September records in Grand Junction
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 99.0°F (2019) | 52.0°F (2020) | 0.83 in (2021) |
| September 2 | 99.0°F (2022) | 52.0°F (2020) | 0.17 in (2016) |
| September 3 | 98.1°F (2017) | 57.9°F (2020) | 0.00 in (2012) |
| September 4 | 99.0°F (2017) | 55.9°F (2012) | 0.32 in (2015) |
| September 5 | 100.9°F (2022) | 55.0°F (2021) | 0.13 in (2015) |
| September 6 | 100.9°F (2022) | 54.0°F (2016) | 0.01 in (2019) |
| September 7 | 99.0°F (2022) | 57.0°F (2016) | 0.08 in (2015) |
| September 8 | 98.1°F (2022) | 37.9°F (2020) | 0.95 in (2020) |
| September 9 | 96.1°F (2021) | 39.9°F (2020) | 1.24 in (2013) |
| September 10 | 96.1°F (2021) | 42.1°F (2020) | 0.24 in (2013) |
| September 11 | 93.0°F (2018) | 46.0°F (2020) | 0.15 in (2012) |
| September 12 | 93.0°F (2015) | 48.0°F (2020) | 0.36 in (2025) |
| September 13 | 91.9°F (2017) | 48.0°F (2020) | 0.21 in (2013) |
| September 14 | 90.0°F (2021) | 46.0°F (2025) | 0.94 in (2022) |
| September 15 | 93.0°F (2018) | 50.0°F (2016) | 0.46 in (2015) |
| September 16 | 93.0°F (2018) | 48.0°F (2016) | 0.26 in (2022) |
| September 17 | 91.9°F (2018) | 48.0°F (2016) | 0.08 in (2013) |
| September 18 | 93.0°F (2018) | 48.0°F (2024) | 0.05 in (2013) |
| September 19 | 89.1°F (2014) | 50.0°F (2024) | 0.00 in (2012) |
| September 20 | 91.0°F (2014) | 48.9°F (2013) | 0.04 in (2022) |
| September 21 | 88.0°F (2020) | 46.0°F (2019) | 0.27 in (2014) |
| September 22 | 88.0°F (2016) | 44.1°F (2019) | 0.70 in (2013) |
| September 23 | 87.1°F (2015) | 44.1°F (2017) | 0.32 in (2016) |
| September 24 | 91.0°F (2015) | 42.1°F (2017) | 0.11 in (2012) |
| September 25 | 90.0°F (2015) | 37.9°F (2017) | 0.09 in (2012) |
| September 26 | 90.0°F (2024) | 42.1°F (2017) | 0.16 in (2012) |
| September 27 | 91.0°F (2024) | 42.1°F (2013) | 0.19 in (2013) |
| September 28 | 91.0°F (2024) | 37.0°F (2013) | 0.89 in (2014) |
| September 29 | 90.0°F (2024) | 39.0°F (2013) | 0.82 in (2021) |
| September 30 | 91.0°F (2024) | 46.0°F (2014) | 0.45 in (2022) |