September weather in Marathon, NY
The average temperature in Marathon in September is 60.9°F (49.4°F–72.3°F). Average precipitation: 3.96 inches.
September is a fall month in Marathon, and is warmer than the annual average of 46.8°F. Daily temperatures swing about 22.9°F between overnight low and afternoon high. Daylight averages about 12h 16m. For travel, September is a comfortable month to visit.
Avg High
72.3°F
Avg Low
49.4°F
Precipitation
3.96 in
Daylight
12h 16m
September records in Marathon
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 87.1°F (2012) | 41.0°F (2017) | 0.96 in (1950) |
| September 2 | 84.9°F (2015) | 39.0°F (2017) | 1.13 in (2013) |
| September 3 | 84.0°F (2014) | 42.1°F (2017) | 1.00 in (2013) |
| September 4 | 88.0°F (2011) | 44.1°F (2024) | 0.11 in (2017) |
| September 5 | 87.1°F (2011) | 46.0°F (2020) | 1.28 in (2022) |
| September 6 | 90.0°F (2018) | 42.1°F (2013) | 1.62 in (2022) |
| September 7 | 88.0°F (2023) | 42.1°F (2013) | 0.31 in (2011) |
| September 8 | 91.0°F (2015) | 42.1°F (2025) | 6.75 in (2011) |
| September 9 | 91.9°F (2015) | 41.0°F (2013) | 0.51 in (2021) |
| September 10 | 89.1°F (2015) | 42.1°F (2013) | 0.46 in (2021) |
| September 11 | 86.0°F (2013) | 42.1°F (2012) | 2.29 in (2018) |
| September 12 | 89.1°F (2013) | 42.1°F (2012) | 1.19 in (2013) |
| September 13 | 80.1°F (2024) | 43.0°F (2014) | 0.30 in (1949) |
| September 14 | 82.9°F (2016) | 45.0°F (2014) | 0.79 in (1951) |
| September 15 | 82.9°F (2024) | 39.0°F (2020) | 0.50 in (2017) |
| September 16 | 82.0°F (2018) | 37.9°F (2020) | 0.64 in (2021) |
| September 17 | 84.9°F (2015) | 36.0°F (2013) | 0.03 in (2019) |
| September 18 | 84.0°F (2015) | 36.0°F (2013) | 3.49 in (2018) |
| September 19 | 84.0°F (2015) | 32.0°F (2020) | 0.65 in (2012) |
| September 20 | 82.0°F (2017) | 34.0°F (2020) | 0.34 in (2015) |
| September 21 | 84.0°F (2016) | 34.0°F (2020) | 0.09 in (1949) |
| September 22 | 82.0°F (2017) | 34.0°F (2020) | 0.70 in (2013) |
| September 23 | 86.0°F (2019) | 35.1°F (2020) | 0.51 in (2022) |
| September 24 | 84.0°F (2017) | 37.0°F (2013) | 1.15 in (2025) |
| September 25 | 88.0°F (2017) | 35.1°F (2012) | 0.73 in (2018) |
| September 26 | 89.1°F (2017) | 36.0°F (2012) | 0.82 in (2025) |
| September 27 | 89.1°F (2017) | 36.0°F (2016) | 0.26 in (2024) |
| September 28 | 88.0°F (2017) | 41.0°F (2013) | 0.80 in (2011) |
| September 29 | 82.9°F (2019) | 42.1°F (2017) | 1.54 in (2011) |
| September 30 | 81.0°F (2014) | 37.9°F (2022) | 1.56 in (2015) |