August weather in Grand Junction, CO
The average temperature in Grand Junction in August is 77.4°F (63.9°F–90.8°F). Average precipitation: 1.03 inches.
August is a summer month in Grand Junction, and is warmer than the annual average of 54.6°F. Daily temperatures swing about 26.9°F between overnight low and afternoon high. Daylight averages about 13h 32m. For travel, August is hot.
Avg High
90.8°F
Avg Low
63.9°F
Precipitation
1.03 in
Daylight
13h 32m
August records in Grand Junction
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| August 1 | 100.9°F (2020) | 63.0°F (2013) | 0.29 in (2023) |
| August 2 | 102.0°F (2020) | 61.0°F (2014) | 0.03 in (2015) |
| August 3 | 102.0°F (2020) | 63.0°F (2023) | 0.18 in (2014) |
| August 4 | 100.0°F (2020) | 57.9°F (2014) | 0.77 in (2014) |
| August 5 | 100.0°F (2024) | 61.0°F (2014) | 0.16 in (2014) |
| August 6 | 100.0°F (2019) | 61.0°F (2017) | 0.18 in (2016) |
| August 7 | 102.0°F (2025) | 61.0°F (2016) | 0.00 in (2012) |
| August 8 | 100.0°F (2012) | 61.0°F (2013) | 0.03 in (2016) |
| August 9 | 100.0°F (2018) | 60.1°F (2013) | 0.17 in (2024) |
| August 10 | 100.0°F (2018) | 59.0°F (2013) | 0.03 in (2016) |
| August 11 | 98.1°F (2022) | 57.0°F (2013) | 0.31 in (2017) |
| August 12 | 99.0°F (2018) | 57.0°F (2017) | 0.16 in (2024) |
| August 13 | 100.0°F (2021) | 59.0°F (2013) | 0.30 in (2024) |
| August 14 | 99.0°F (2020) | 60.1°F (2016) | 0.32 in (2014) |
| August 15 | 99.0°F (2015) | 61.0°F (2012) | 0.07 in (2022) |
| August 16 | 99.0°F (2019) | 59.0°F (2017) | 0.02 in (2018) |
| August 17 | 98.1°F (2020) | 61.0°F (2017) | 0.34 in (2023) |
| August 18 | 100.9°F (2020) | 61.0°F (2017) | 0.61 in (2023) |
| August 19 | 100.9°F (2025) | 54.0°F (2021) | 0.93 in (2021) |
| August 20 | 100.9°F (2020) | 50.0°F (2021) | 0.04 in (2022) |
| August 21 | 102.9°F (2025) | 55.0°F (2021) | 0.73 in (2018) |
| August 22 | 100.9°F (2025) | 60.1°F (2018) | 0.08 in (2014) |
| August 23 | 98.1°F (2020) | 55.9°F (2014) | 0.57 in (2013) |
| August 24 | 99.0°F (2020) | 53.1°F (2014) | 0.21 in (2024) |
| August 25 | 100.0°F (2019) | 57.0°F (2016) | 0.59 in (2013) |
| August 26 | 99.0°F (2020) | 53.1°F (2016) | 0.24 in (2025) |
| August 27 | 98.1°F (2020) | 55.0°F (2016) | 0.43 in (2015) |
| August 28 | 96.1°F (2017) | 57.0°F (2014) | 0.04 in (2016) |
| August 29 | 98.1°F (2017) | 55.9°F (2016) | 0.05 in (2020) |
| August 30 | 97.0°F (2023) | 53.1°F (2025) | 0.24 in (2015) |
| August 31 | 98.1°F (2022) | 57.9°F (2020) | 0.05 in (2020) |