October weather in Port Jefferson, NY
The average temperature in Port Jefferson in October is 56.8°F (48.8°F–64.8°F). Average precipitation: 4.24 inches.
October is a fall month in Port Jefferson, and is warmer than the annual average of 54.7°F. Daily temperatures swing about 16°F between overnight low and afternoon high. Daylight averages about 10h 53m. For travel, October is a comfortable month to visit.
Avg High
64.8°F
Avg Low
48.8°F
Precipitation
4.24 in
Daylight
10h 53m
October records in Port Jefferson
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| October 1 | 81.0°F (2017) | 39.9°F (2006) | 0.85 in (2010) |
| October 2 | 90.0°F (2019) | 39.9°F (2006) | 0.80 in (2015) |
| October 3 | 91.0°F (2019) | 46.9°F (2006) | 1.15 in (2018) |
| October 4 | 82.0°F (2013) | 46.9°F (2020) | 1.05 in (2014) |
| October 5 | 82.0°F (2023) | 46.0°F (2019) | 1.00 in (2022) |
| October 6 | 82.0°F (2017) | 39.0°F (2014) | 0.21 in (2022) |
| October 7 | 88.0°F (2017) | 45.0°F (2011) | 0.10 in (2013) |
| October 8 | 93.0°F (2017) | 44.1°F (2006) | 0.34 in (2017) |
| October 9 | 98.1°F (2017) | 43.0°F (2020) | 0.82 in (2016) |
| October 10 | 93.0°F (2017) | 37.9°F (2010) | 0.53 in (2015) |
| October 11 | 84.0°F (2018) | 35.1°F (2016) | 0.48 in (2014) |
| October 12 | 87.1°F (2018) | 44.1°F (2012) | 1.50 in (2006) |
| October 13 | 73.9°F (2020) | 35.1°F (2012) | 1.93 in (2025) |
| October 14 | 77.0°F (2017) | 33.1°F (2006) | 0.82 in (2025) |
| October 15 | 81.0°F (2017) | 37.0°F (2006) | 1.58 in (2010) |
| October 16 | 79.0°F (2017) | 34.0°F (2006) | 1.32 in (2014) |
| October 17 | 78.1°F (2016) | 41.0°F (2006) | 2.20 in (2019) |
| October 18 | 78.1°F (2016) | 39.0°F (2015) | 0.50 in (2006) |
| October 19 | 79.0°F (2016) | 34.0°F (2015) | 1.03 in (2012) |
| October 20 | 75.9°F (2016) | 39.0°F (2019) | 0.52 in (2011) |
| October 21 | 77.0°F (2016) | 39.0°F (2013) | 0.86 in (2023) |
| October 22 | 81.0°F (2020) | 35.1°F (2006) | 0.39 in (2016) |
| October 23 | 80.1°F (2024) | 39.0°F (2018) | 0.68 in (2014) |
| October 24 | 77.0°F (2020) | 39.0°F (2015) | 1.62 in (2022) |
| October 25 | 82.0°F (2017) | 41.0°F (2018) | 1.39 in (2017) |
| October 26 | 75.0°F (2017) | 33.1°F (2013) | 3.44 in (2021) |
| October 27 | 79.0°F (2023) | 34.0°F (2006) | 2.14 in (2021) |
| October 28 | 78.1°F (2010) | 35.1°F (2013) | 3.10 in (2006) |
| October 29 | 78.1°F (2023) | 36.0°F (2016) | 1.84 in (2017) |
| October 30 | 82.0°F (2017) | 34.0°F (2013) | 2.38 in (2017) |
| October 31 | 73.0°F (2023) | 30.0°F (2011) | 2.58 in (2025) |