September weather in Castle Valley, UT
The average temperature in Castle Valley in September is 69.7°F (56.0°F–83.4°F). Average precipitation: 1.31 inches.
September is a fall month in Castle Valley, and is warmer than the annual average of 54.7°F. Daily temperatures swing about 27.4°F between overnight low and afternoon high. Daylight averages about 12h 14m. For travel, September is a comfortable month to visit.
Avg High
83.4°F
Avg Low
56.0°F
Precipitation
1.31 in
Daylight
12h 14m
September records in Castle Valley
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 98.1°F (2019) | 50.0°F (2020) | 0.07 in (2021) |
| September 2 | 99.0°F (2019) | 55.0°F (2020) | 0.51 in (2021) |
| September 3 | 100.0°F (2022) | 61.0°F (2020) | 0.02 in (2021) |
| September 4 | 100.0°F (2022) | 55.9°F (2021) | 0.47 in (2016) |
| September 5 | 100.9°F (2017) | 55.0°F (2023) | 0.08 in (2015) |
| September 6 | 100.9°F (2022) | 55.0°F (2016) | 0.00 in (2015) |
| September 7 | 102.9°F (2022) | 57.9°F (2018) | 0.00 in (2015) |
| September 8 | 102.0°F (2022) | 46.0°F (2020) | 0.10 in (2020) |
| September 9 | 99.0°F (2022) | 39.0°F (2020) | 0.13 in (2020) |
| September 10 | 97.0°F (2021) | 39.0°F (2020) | 0.09 in (2020) |
| September 11 | 96.1°F (2021) | 39.0°F (2020) | 0.23 in (2019) |
| September 12 | 93.9°F (2015) | 39.0°F (2020) | 0.19 in (2019) |
| September 13 | 93.9°F (2017) | 48.9°F (2020) | 0.00 in (2015) |
| September 14 | 91.9°F (2015) | 48.9°F (2019) | 0.20 in (2022) |
| September 15 | 91.9°F (2018) | 48.0°F (2017) | 0.75 in (2017) |
| September 16 | 93.0°F (2018) | 48.9°F (2016) | 0.06 in (2022) |
| September 17 | 91.9°F (2018) | 48.9°F (2016) | 0.00 in (2015) |
| September 18 | 93.0°F (2018) | 48.9°F (2024) | 0.00 in (2015) |
| September 19 | 91.9°F (2018) | 50.0°F (2015) | 0.15 in (2023) |
| September 20 | 89.1°F (2016) | 50.0°F (2017) | 0.16 in (2023) |
| September 21 | 89.1°F (2019) | 44.1°F (2021) | 0.04 in (2022) |
| September 22 | 89.1°F (2020) | 44.1°F (2021) | 0.02 in (2016) |
| September 23 | 87.1°F (2018) | 46.0°F (2016) | 0.27 in (2016) |
| September 24 | 87.1°F (2015) | 41.0°F (2017) | 0.14 in (2017) |
| September 25 | 89.1°F (2020) | 37.9°F (2017) | 0.01 in (2016) |
| September 26 | 91.0°F (2020) | 41.0°F (2017) | 0.00 in (2015) |
| September 27 | 90.0°F (2024) | 45.0°F (2017) | 0.00 in (2016) |
| September 28 | 91.9°F (2024) | 46.0°F (2017) | 0.13 in (2017) |
| September 29 | 88.0°F (2015) | 44.1°F (2020) | 0.65 in (2021) |
| September 30 | 91.9°F (2024) | 45.0°F (2017) | 0.19 in (2016) |