March weather in Port Jefferson, NY
The average temperature in Port Jefferson in March is 41.4°F (32.8°F–50.0°F). Average precipitation: 4.65 inches.
March is a spring month in Port Jefferson, and is cooler than the annual average of 54.7°F. Daily temperatures swing about 17.2°F between overnight low and afternoon high. Daylight averages about 11h 43m. For travel, March is cool.
Avg High
50.0°F
Avg Low
32.8°F
Precipitation
4.65 in
Daylight
11h 43m
March records in Port Jefferson
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| March 1 | 61.0°F (2017) | 7.0°F (2015) | 0.58 in (2008) |
| March 2 | 62.1°F (2017) | 21.0°F (2002) | 3.00 in (2007) |
| March 3 | 57.0°F (2012) | 15.1°F (2003) | 1.76 in (2024) |
| March 4 | 61.0°F (2024) | 3.9°F (2003) | 1.10 in (2019) |
| March 5 | 64.9°F (2024) | 14.0°F (2017) | 0.75 in (2015) |
| March 6 | 60.1°F (2024) | 10.9°F (2007) | 1.70 in (2025) |
| March 7 | 64.0°F (2002) | 10.0°F (2007) | 1.85 in (2024) |
| March 8 | 63.0°F (2008) | 8.1°F (2007) | 4.30 in (2008) |
| March 9 | 73.0°F (2016) | 10.9°F (2007) | 0.16 in (2004) |
| March 10 | 79.0°F (2016) | 17.1°F (2003) | 2.15 in (2024) |
| March 11 | 69.1°F (2016) | 10.0°F (2003) | 0.58 in (2011) |
| March 12 | 69.1°F (2012) | 16.0°F (2017) | 1.18 in (2013) |
| March 13 | 64.0°F (2012) | 18.0°F (2017) | 2.17 in (2010) |
| March 14 | 69.1°F (2002) | 18.0°F (2014) | 2.05 in (2010) |
| March 15 | 66.0°F (2007) | 19.9°F (2017) | 0.62 in (2016) |
| March 16 | 66.0°F (2003) | 24.1°F (2017) | 1.50 in (2007) |
| March 17 | 68.0°F (2003) | 23.0°F (2014) | 1.57 in (2026) |
| March 18 | 75.0°F (2011) | 18.0°F (2014) | 0.37 in (2021) |
| March 19 | 72.0°F (2012) | 21.0°F (2019) | 0.94 in (2013) |
| March 20 | 72.0°F (2010) | 23.0°F (2015) | 0.94 in (2002) |
| March 21 | 69.1°F (2012) | 24.1°F (2006) | 0.80 in (2003) |
| March 22 | 75.0°F (2012) | 26.1°F (2013) | 1.05 in (2019) |
| March 23 | 71.1°F (2012) | 19.0°F (2015) | 1.22 in (2010) |
| March 24 | 68.0°F (2016) | 21.0°F (2014) | 2.40 in (2024) |
| March 25 | 64.9°F (2021) | 18.0°F (2014) | 0.87 in (2025) |
| March 26 | 70.0°F (2021) | 26.1°F (2011) | 0.30 in (2010) |
| March 27 | 73.0°F (2007) | 26.1°F (2018) | 1.41 in (2002) |
| March 28 | 68.0°F (2021) | 24.1°F (2019) | 1.30 in (2021) |
| March 29 | 64.9°F (2021) | 24.1°F (2019) | 2.55 in (2010) |
| March 30 | 82.9°F (2025) | 26.1°F (2008) | 3.14 in (2014) |
| March 31 | 66.9°F (2016) | 27.0°F (2008) | 1.58 in (2004) |