August weather in Port Jefferson, NY
The average temperature in Port Jefferson in August is 74.4°F (67.0°F–81.8°F). Average precipitation: 4.02 inches.
August is a summer month in Port Jefferson, and is warmer than the annual average of 54.7°F. Daily temperatures swing about 14.8°F between overnight low and afternoon high. Daylight averages about 13h 38m. For travel, August is a comfortable month to visit.
Avg High
81.8°F
Avg Low
67.0°F
Precipitation
4.02 in
Daylight
13h 38m
August records in Port Jefferson
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| August 1 | 93.9°F (2006) | 55.9°F (2017) | 1.65 in (2025) |
| August 2 | 95.0°F (2006) | 60.1°F (2023) | 0.62 in (2003) |
| August 3 | 95.0°F (2006) | 57.9°F (2023) | 0.79 in (2002) |
| August 4 | 91.0°F (2024) | 57.0°F (2016) | 0.97 in (2018) |
| August 5 | 93.9°F (2005) | 57.9°F (2016) | 0.31 in (2005) |
| August 6 | 91.0°F (2018) | 55.9°F (2013) | 1.18 in (2008) |
| August 7 | 88.0°F (2018) | 57.9°F (2002) | 0.80 in (2024) |
| August 8 | 87.1°F (2018) | 61.0°F (2002) | 1.76 in (2003) |
| August 9 | 88.0°F (2010) | 59.0°F (2002) | 0.62 in (2012) |
| August 10 | 91.9°F (2020) | 57.9°F (2002) | 1.58 in (2012) |
| August 11 | 95.0°F (2024) | 53.1°F (2013) | 1.32 in (2015) |
| August 12 | 93.9°F (2016) | 57.0°F (2011) | 0.98 in (2020) |
| August 13 | 96.1°F (2016) | 55.9°F (2006) | 4.60 in (2014) |
| August 14 | 96.1°F (2016) | 54.0°F (2006) | 5.59 in (2011) |
| August 15 | 90.0°F (2016) | 57.0°F (2014) | 2.40 in (2011) |
| August 16 | 90.0°F (2002) | 55.9°F (2014) | 0.98 in (2020) |
| August 17 | 91.0°F (2002) | 55.9°F (2013) | 0.65 in (2005) |
| August 18 | 93.9°F (2002) | 57.0°F (2014) | 1.88 in (2017) |
| August 19 | 91.0°F (2002) | 57.9°F (2013) | 7.22 in (2024) |
| August 20 | 87.1°F (2002) | 57.9°F (2008) | 1.28 in (2024) |
| August 21 | 89.1°F (2005) | 55.0°F (2024) | 0.62 in (2025) |
| August 22 | 89.1°F (2003) | 57.0°F (2024) | 1.56 in (2021) |
| August 23 | 88.0°F (2019) | 55.9°F (2008) | 1.60 in (2022) |
| August 24 | 90.0°F (2020) | 57.0°F (2014) | 0.09 in (2010) |
| August 25 | 88.0°F (2020) | 55.0°F (2013) | 0.88 in (2006) |
| August 26 | 90.0°F (2016) | 57.0°F (2018) | 0.40 in (2023) |
| August 27 | 88.0°F (2020) | 46.0°F (2015) | 0.54 in (2013) |
| August 28 | 91.0°F (2018) | 55.0°F (2008) | 3.31 in (2011) |
| August 29 | 91.9°F (2018) | 55.9°F (2003) | 2.42 in (2002) |
| August 30 | 89.1°F (2018) | 55.0°F (2012) | 1.07 in (2006) |
| August 31 | 91.0°F (2010) | 57.0°F (2002) | 0.15 in (2023) |