Port Jefferson Harbor Entrance Weather Forecast
- 72
- 85
Chance Thunderstorms
- 68
- 82
Mostly Sunny
- 71
- 79
Chance Thunderstorms
- 69
- 79
Chance Thunderstorms
- 70
- 80
Partly Sunny
- 71
- 80
Slight Chance Rain Showers
Today 17 Jul Northwest Suffolk
Patchy fog in the morning. Partly sunny with a chance of Showers and Thunderstorms. Some Thunderstorms may produce gusty Winds and heavy rainfall. Humid with Highs around 90. Southwest Winds 10 to 15 Mph. Chance of rain 50 percent. Heat index Values up to 102.
Tonight 17 Jul Northwest Suffolk
Partly cloudy. A chance of Showers and Thunderstorms in the evening. Some Thunderstorms may produce gusty Winds and heavy rainfall in the evening. Humid with Lows in the lower 70s. Southwest Winds 10 to 15 Mph, becoming west 5 to 10 Mph after midnight. Chance of rain 40 percent.
Port Jefferson Harbor Entrance Temperature Statistics
July Temperature
Islip, Long Island Mac Arthur Airport (11.8 miles)
Lowest 5 July, 2025
64.7 °FAverage July
77.4 °FHighest 8 July, 2025
92.6 °F
Climate (2020–Present)
Islip, Long Island Mac Arthur Airport (11.8 miles)
Average Low 2020–2025
47.5 °FAverage 2020–2025
55.2 °FAverage High 2020–2025
63 °F