September weather in Siletz, OR
The average temperature in Siletz in September is 57.3°F (49.2°F–65.5°F). Average precipitation: inches.
September is a fall month in Siletz, and is warmer than the annual average of 52.2°F. Daily temperatures swing about 16.3°F between overnight low and afternoon high. Daylight averages about 12h 18m. For travel, September is a comfortable month to visit.
Avg High
65.5°F
Avg Low
49.2°F
Precipitation
in
Daylight
12h 18m
September records in Siletz
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 70.0°F (2019) | 44.1°F (2021) | 0.72 in (2010) |
| September 2 | 75.9°F (2017) | 43.0°F (2021) | 0.14 in (2016) |
| September 3 | 80.1°F (2017) | 43.0°F (2021) | 1.16 in (2022) |
| September 4 | 84.9°F (2017) | 44.1°F (2021) | 0.10 in (2023) |
| September 5 | 81.0°F (2017) | 45.0°F (2015) | 0.33 in (2009) |
| September 6 | 91.0°F (2014) | 44.1°F (2011) | 1.43 in (2013) |
| September 7 | 71.1°F (2023) | 44.1°F (2010) | 0.48 in (2009) |
| September 8 | 79.0°F (2020) | 46.0°F (2011) | 0.04 in (2012) |
| September 9 | 75.9°F (2020) | 45.0°F (2009) | 0.67 in (2019) |
| September 10 | 91.0°F (2022) | 44.1°F (2011) | 0.41 in (2019) |
| September 11 | 77.0°F (2022) | 44.1°F (2011) | 0.11 in (2024) |
| September 12 | 82.0°F (2014) | 43.0°F (2012) | 0.40 in (2024) |
| September 13 | 75.9°F (2014) | 43.0°F (2012) | 0.15 in (2018) |
| September 14 | 79.0°F (2016) | 44.1°F (2020) | 0.95 in (2025) |
| September 15 | 73.9°F (2014) | 46.0°F (2012) | 0.10 in (2013) |
| September 16 | 75.0°F (2009) | 43.0°F (2021) | 1.45 in (2010) |
| September 17 | 82.0°F (2025) | 42.1°F (2021) | 1.00 in (2015) |
| September 18 | 78.1°F (2012) | 44.1°F (2012) | 1.40 in (2019) |
| September 19 | 70.0°F (2009) | 42.1°F (2025) | 0.92 in (2010) |
| September 20 | 75.0°F (2017) | 45.0°F (2018) | 1.18 in (2017) |
| September 21 | 77.0°F (2014) | 44.1°F (2023) | 0.44 in (2017) |
| September 22 | 84.9°F (2009) | 44.1°F (2016) | 0.18 in (2018) |
| September 23 | 78.1°F (2009) | 44.1°F (2012) | 0.10 in (2021) |
| September 24 | 75.0°F (2025) | 44.1°F (2015) | 1.63 in (2014) |
| September 25 | 79.0°F (2021) | 45.0°F (2012) | 1.15 in (2013) |
| September 26 | 75.0°F (2016) | 44.1°F (2013) | 0.65 in (2020) |
| September 27 | 73.0°F (2016) | 41.0°F (2015) | 1.42 in (2011) |
| September 28 | 87.1°F (2017) | 41.0°F (2015) | 0.80 in (2013) |
| September 29 | 86.0°F (2020) | 41.0°F (2015) | 1.30 in (2013) |
| September 30 | 87.1°F (2020) | 41.0°F (2016) | 1.58 in (2013) |