September weather in Koyukuk, AK
The average temperature in Koyukuk in September is 43.5°F (35.4°F–51.7°F). Average precipitation: 1.75 inches. Average snowfall is 0.3 inches.
September is a fall month in Koyukuk, and is warmer than the annual average of 26°F. Daily temperatures swing about 16.3°F between overnight low and afternoon high. Expect about 12 days with precipitation. Daylight averages about 12h 38m. For travel, September is cool.
Avg High
51.7°F
Avg Low
35.4°F
Precipitation
1.75 in
Snow
0.3 in
September records in Koyukuk
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 69.1°F (2006) | 26.1°F (2005) | 0.63 in (2025) |
| September 2 | 68.0°F (2006) | 28.0°F (2024) | 0.25 in (2025) |
| September 3 | 69.1°F (2008) | 28.9°F (2004) | 0.37 in (2021) |
| September 4 | 70.0°F (2006) | 21.9°F (1999) | 0.28 in (2010) |
| September 5 | 70.0°F (2009) | 32.0°F (2022) | 0.73 in (2023) |
| September 6 | 73.0°F (2009) | 23.0°F (1999) | 0.27 in (2019) |
| September 7 | 69.1°F (1997) | 26.1°F (2004) | 0.46 in (2020) |
| September 8 | 68.0°F (1997) | 27.0°F (2004) | 0.49 in (2025) |
| September 9 | 66.0°F (2007) | 28.0°F (2004) | 0.38 in (2023) |
| September 10 | 66.9°F (1999) | 24.1°F (2012) | 0.86 in (2005) |
| September 11 | 66.9°F (1999) | 27.0°F (2012) | 0.39 in (2021) |
| September 12 | 70.0°F (2010) | 25.0°F (2012) | 0.53 in (2004) |
| September 13 | 69.1°F (2010) | 23.0°F (2003) | 0.50 in (2016) |
| September 14 | 69.1°F (2010) | 23.0°F (2003) | 1.42 in (2017) |
| September 15 | 68.0°F (2006) | 21.9°F (2003) | 0.42 in (2024) |
| September 16 | 64.0°F (2006) | 28.9°F (2000) | 0.29 in (1997) |
| September 17 | 64.9°F (2006) | 24.1°F (2000) | 0.25 in (2008) |
| September 18 | 61.0°F (2010) | 19.9°F (2003) | 0.47 in (2011) |
| September 19 | 68.0°F (2006) | 19.0°F (2003) | 0.51 in (2005) |
| September 20 | 64.9°F (2006) | 18.0°F (2003) | 0.29 in (2022) |
| September 21 | 62.1°F (1999) | 21.0°F (2002) | 0.80 in (2000) |
| September 22 | 57.9°F (2010) | 15.1°F (2003) | 0.47 in (2004) |
| September 23 | 59.0°F (1997) | 12.9°F (1996) | 0.52 in (2016) |
| September 24 | 57.0°F (1997) | 16.0°F (1996) | 0.43 in (2005) |
| September 25 | 57.0°F (1997) | 15.1°F (2021) | 0.26 in (2000) |
| September 26 | 57.9°F (1997) | 15.1°F (2021) | 0.18 in (2011) |
| September 27 | 55.0°F (2002) | 14.0°F (2010) | 0.21 in (1997) |
| September 28 | 52.0°F (2001) | 12.0°F (2010) | 0.12 in (2003) |
| September 29 | 51.1°F (2016) | 12.0°F (1999) | 0.53 in (2019) |
| September 30 | 52.0°F (2016) | 17.1°F (2008) | 0.53 in (2004) |