July weather in Port Jefferson, NY
The average temperature in Port Jefferson in July is 75.3°F (67.5°F–83.1°F). Average precipitation: 3.88 inches.
July is a summer month in Port Jefferson, and is warmer than the annual average of 54.7°F. Daily temperatures swing about 15.6°F between overnight low and afternoon high. Daylight averages about 14h 40m. For travel, July is a comfortable month to visit.
Avg High
83.1°F
Avg Low
67.5°F
Precipitation
3.88 in
Daylight
14h 40m
July records in Port Jefferson
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| July 1 | 91.9°F (2018) | 54.0°F (2010) | 0.80 in (2021) |
| July 2 | 91.9°F (2018) | 54.0°F (2007) | 0.60 in (2022) |
| July 3 | 93.0°F (2002) | 55.0°F (2007) | 0.81 in (2021) |
| July 4 | 93.0°F (2002) | 57.9°F (2005) | 1.04 in (2014) |
| July 5 | 93.0°F (2010) | 57.9°F (2015) | 1.59 in (2016) |
| July 6 | 97.0°F (2010) | 60.1°F (2006) | 0.72 in (2006) |
| July 7 | 95.0°F (2010) | 59.0°F (2006) | 0.67 in (2021) |
| July 8 | 89.1°F (2014) | 54.0°F (2018) | 1.60 in (2005) |
| July 9 | 91.9°F (2020) | 57.9°F (2005) | 3.82 in (2021) |
| July 10 | 89.1°F (2007) | 61.0°F (2003) | 0.81 in (2010) |
| July 11 | 90.0°F (2020) | 59.0°F (2002) | 0.51 in (2020) |
| July 12 | 91.0°F (2020) | 54.0°F (2002) | 0.30 in (2017) |
| July 13 | 93.0°F (2023) | 60.1°F (2007) | 1.45 in (2010) |
| July 14 | 90.0°F (2023) | 60.1°F (2020) | 1.36 in (2024) |
| July 15 | 90.0°F (2013) | 57.0°F (2003) | 1.05 in (2014) |
| July 16 | 90.0°F (2013) | 63.0°F (2008) | 2.04 in (2012) |
| July 17 | 93.0°F (2019) | 57.9°F (2002) | 3.16 in (2023) |
| July 18 | 93.9°F (2002) | 62.1°F (2007) | 1.64 in (2022) |
| July 19 | 93.0°F (2013) | 61.0°F (2014) | 1.50 in (2013) |
| July 20 | 95.0°F (2020) | 59.0°F (2003) | 1.23 in (2010) |
| July 21 | 93.9°F (2019) | 59.0°F (2014) | 0.10 in (2015) |
| July 22 | 97.0°F (2011) | 52.0°F (2016) | 1.28 in (2010) |
| July 23 | 93.0°F (2016) | 59.0°F (2015) | 1.81 in (2019) |
| July 24 | 93.0°F (2016) | 57.9°F (2007) | 2.20 in (2013) |
| July 25 | 90.0°F (2020) | 55.9°F (2002) | 0.21 in (2018) |
| July 26 | 93.9°F (2020) | 55.9°F (2002) | 0.64 in (2013) |
| July 27 | 95.0°F (2020) | 57.9°F (2017) | 0.85 in (2008) |
| July 28 | 95.0°F (2020) | 61.0°F (2002) | 0.33 in (2012) |
| July 29 | 93.9°F (2020) | 61.0°F (2005) | 0.64 in (2016) |
| July 30 | 93.0°F (2002) | 57.0°F (2014) | 0.15 in (2021) |
| July 31 | 91.9°F (2002) | 59.0°F (2017) | 1.20 in (2020) |