August weather in Monticello, UT
The average temperature in Monticello in August is 67.5°F (53.6°F–81.3°F). Average precipitation: 1.93 inches.
August is a summer month in Monticello, and is warmer than the annual average of 47.3°F. Daily temperatures swing about 27.7°F between overnight low and afternoon high. Daylight averages about 13h 28m. For travel, August is a comfortable month to visit.
Avg High
81.3°F
Avg Low
53.6°F
Precipitation
1.93 in
Daylight
13h 28m
August records in Monticello
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| August 1 | 91.0°F (2024) | 53.1°F (2023) | 0.48 in (2016) |
| August 2 | 93.9°F (2024) | 52.0°F (2019) | 0.77 in (2013) |
| August 3 | 91.9°F (2020) | 50.0°F (2012) | 0.56 in (2021) |
| August 4 | 91.9°F (2020) | 50.0°F (2012) | 0.67 in (2013) |
| August 5 | 89.1°F (2018) | 48.9°F (2012) | 0.29 in (2022) |
| August 6 | 90.0°F (2024) | 46.9°F (2017) | 1.93 in (2016) |
| August 7 | 91.0°F (2025) | 50.0°F (2017) | 0.18 in (2013) |
| August 8 | 90.0°F (2018) | 48.9°F (2015) | 0.33 in (2013) |
| August 9 | 89.1°F (2018) | 48.9°F (2015) | 0.29 in (2017) |
| August 10 | 90.0°F (2012) | 48.9°F (2015) | 0.09 in (2017) |
| August 11 | 90.0°F (2025) | 48.0°F (2023) | 0.24 in (2024) |
| August 12 | 90.0°F (2012) | 46.9°F (2013) | 0.22 in (2024) |
| August 13 | 90.0°F (2012) | 50.0°F (2017) | 1.32 in (2024) |
| August 14 | 90.0°F (2025) | 48.0°F (2016) | 1.48 in (2014) |
| August 15 | 89.1°F (2019) | 48.0°F (2017) | 0.39 in (2014) |
| August 16 | 88.0°F (2020) | 46.0°F (2025) | 0.06 in (2022) |
| August 17 | 91.0°F (2020) | 46.9°F (2025) | 0.60 in (2015) |
| August 18 | 90.0°F (2020) | 48.0°F (2025) | 0.15 in (2024) |
| August 19 | 93.0°F (2020) | 46.9°F (2016) | 0.55 in (2021) |
| August 20 | 93.0°F (2020) | 39.0°F (2021) | 1.11 in (2021) |
| August 21 | 91.9°F (2020) | 39.9°F (2021) | 0.08 in (2013) |
| August 22 | 91.0°F (2025) | 50.0°F (2014) | 0.35 in (2018) |
| August 23 | 93.9°F (2020) | 48.0°F (2017) | 0.61 in (2016) |
| August 24 | 90.0°F (2020) | 46.0°F (2014) | 1.14 in (2012) |
| August 25 | 90.0°F (2011) | 45.0°F (2016) | 0.75 in (2023) |
| August 26 | 90.0°F (2011) | 41.0°F (2016) | 0.96 in (2013) |
| August 27 | 90.0°F (2011) | 39.9°F (2016) | 0.57 in (2022) |
| August 28 | 88.0°F (2017) | 44.1°F (2018) | 0.30 in (2014) |
| August 29 | 88.0°F (2019) | 46.9°F (2018) | 0.17 in (2020) |
| August 30 | 86.0°F (2012) | 44.1°F (2025) | 0.31 in (2011) |
| August 31 | 86.0°F (2017) | 46.0°F (2025) | 0.11 in (2011) |