September weather in Clyde Park, MT
The average temperature in Clyde Park in September is 52.7°F (35.4°F–70.0°F). Average precipitation: 1.32 inches.
September is a fall month in Clyde Park, and is warmer than the annual average of 41.6°F. Daily temperatures swing about 34.6°F between overnight low and afternoon high. Expect about 6 days with precipitation. Daylight averages about 12h 18m. For travel, September is cool.
Avg High
70.0°F
Avg Low
35.4°F
Precipitation
1.32 in
Daylight
12h 18m
September records in Clyde Park
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 90.0°F (2022) | 30.9°F (2020) | 0.77 in (2008) |
| September 2 | 95.0°F (2022) | 30.9°F (2018) | 0.10 in (2004) |
| September 3 | 90.0°F (2022) | 33.1°F (2018) | 0.10 in (2023) |
| September 4 | 90.0°F (2019) | 33.1°F (2018) | 0.20 in (2024) |
| September 5 | 88.0°F (2019) | 32.0°F (2018) | 0.22 in (2010) |
| September 6 | 87.1°F (2022) | 28.9°F (2025) | 0.75 in (2001) |
| September 7 | 90.0°F (2021) | 39.0°F (2022) | 0.62 in (2002) |
| September 8 | 91.9°F (2021) | 39.0°F (2025) | 0.30 in (2023) |
| September 9 | 89.1°F (2021) | 36.0°F (2025) | 0.63 in (2010) |
| September 10 | 82.9°F (2021) | 23.0°F (2022) | 1.00 in (2019) |
| September 11 | 82.0°F (2021) | 23.0°F (2022) | 0.62 in (2019) |
| September 12 | 75.0°F (2018) | 25.0°F (2022) | 0.10 in (2025) |
| September 13 | 75.0°F (2022) | 30.9°F (2019) | 0.40 in (2003) |
| September 14 | 75.0°F (2024) | 30.0°F (2024) | 0.53 in (2017) |
| September 15 | 82.9°F (2019) | 30.0°F (2024) | 0.40 in (2017) |
| September 16 | 80.1°F (2019) | 28.9°F (2023) | 0.72 in (2025) |
| September 17 | 66.9°F (2018) | 19.9°F (2021) | 0.38 in (2011) |
| September 18 | 72.0°F (2023) | 24.1°F (2019) | 1.45 in (2024) |
| September 19 | 75.0°F (2025) | 28.0°F (2021) | 0.25 in (2024) |
| September 20 | 75.9°F (2025) | 30.0°F (2021) | 1.40 in (2019) |
| September 21 | 73.9°F (2025) | 21.9°F (2021) | 0.34 in (2007) |
| September 22 | 73.0°F (2018) | 24.1°F (2021) | 0.90 in (2023) |
| September 23 | 70.0°F (2019) | 26.1°F (2021) | 0.50 in (2023) |
| September 24 | 78.1°F (2025) | 27.0°F (2021) | 0.98 in (2005) |
| September 25 | 84.0°F (2024) | 25.0°F (2018) | 0.12 in (2013) |
| September 26 | 73.9°F (2021) | 23.0°F (2018) | 0.22 in (2013) |
| September 27 | 84.0°F (2024) | 26.1°F (2021) | 0.50 in (2014) |
| September 28 | 82.0°F (2024) | 26.1°F (2021) | 0.20 in (2019) |
| September 29 | 75.0°F (2024) | 23.0°F (2019) | 0.20 in (2007) |
| September 30 | 70.0°F (2021) | 18.0°F (2021) | 0.20 in (2007) |