10-Day Weather Forecast - Port Jefferson, NY

Mostly sunny. Cooler with highs in the lower 40s. West winds 10 to 15 mph becoming southwest 5 to 10 mph this afternoon.

Partly cloudy in the evening then becoming mostly cloudy. Lows in the lower 30s. Southwest winds 10 to 15 mph with gusts up to 30 mph.

Mostly cloudy in the morning then becoming mostly sunny. Highs in the lower 40s. West winds 15 to 20 mph with gusts up to 30 mph.

Mostly clear. Lows in the mid 20s. Northwest winds 15 to 20 mph with gusts up to 30 mph.

Sunny. Highs in the mid 30s. Northwest winds 10 to 15 mph.

Mostly cloudy. A chance of snow after midnight. Lows in the upper 20s. Chance of snow 40 percent.

Rain and snow likely in the morning then a chance of rain in the afternoon. Little or no snow accumulation. Highs in the lower 40s. Chance of precipitation 70 percent.

Mostly cloudy. Lows in the lower 30s.

Sunny. Highs in the lower 40s.

Mostly cloudy. Lows around 30.

Cloudy with a 40 percent chance of rain. Highs in the upper 40s.

Mostly cloudy. A chance of rain in the evening. Lows in the upper 30s. Chance of rain 40 percent.

Mostly cloudy. Highs around 50.

Mostly clear. Low temperature around 40F. Dew point will be around 37F with an average humidity of 80%. Winds will be 8 mph from the NW.

Mostly sunny. High temperature around 46F. Dew point will be around 37F with an average humidity of 76%. Winds will be 6 mph from the W.

Mostly cloudy with a chance of rain. Chance of precipitation 35%. Low temperature around 40F. Dew point will be around 35F with an average humidity of 76%. Winds will be 6 mph from the W.

Cloudy with a chance of rain. Chance of precipitation 35%. High temperature around 43F. Dew point will be around 33F with an average humidity of 73%. Winds will be 7 mph from the W.

Mostly clear. Low temperature around 33F. Dew point will be around 27F with an average humidity of 70%. Winds will be 9 mph from the NW.