Port Jefferson Weather Forecast
- 70
- 80
Chance Rain Showers
- 73
- 79
Chance Rain Showers
- 74
- 86
Mostly Sunny
- 75
- 89
Mostly Sunny
- 73
- 87
Chance Rain Showers
- 69
- 79
Chance Rain Showers
- 66
- 78
Slight Chance Rain Showers
Today 26 Jul Northwest Suffolk
Mostly sunny. Hazy. Near steady temperature in the lower 80s. Southeast Winds 5 to 10 Mph.
Tonight 26 Jul Northwest Suffolk
Mostly cloudy. Lows in the upper 60s. South Winds 5 to 10 Mph.
Port Jefferson Temperature Statistics
July Temperature
Islip, Long Island Mac Arthur Airport (10.6 miles)
Lowest 23 July, 2025
63.6 °FAverage July
78 °FHighest 8 July, 2025
92.6 °F
Climate (2020–Present)
Islip, Long Island Mac Arthur Airport (10.6 miles)
Average Low 2020–2025
47.5 °FAverage 2020–2025
55.2 °FAverage High 2020–2025
63 °F