10-Day Weather Forecast - Port Jefferson, NY

Mostly sunny. Highs in the lower 30s. West winds 10 to 15 mph with gusts up to 25 mph.

Partly cloudy in the evening then clearing. Brisk with lows around 17. West winds 15 to 25 mph.

Sunny cold with highs in the lower 20s. West winds 15 to 20 mph with gusts up to 30 mph.

Clear. Lows 10 to 15.

Sunny in the morning then becoming partly sunny. Highs in the mid 30s.

Mostly cloudy. Not as cool with lows in the upper 20s.

Mostly cloudy with a chance of rain and snow in the morning then partly sunny in the afternoon. Highs in the upper 30s. Chance of precipitation 30 percent.

Partly cloudy in the evening then becoming mostly clear. Lows around 20.

Mostly sunny. Highs around 30.

Mostly cloudy in the evening then becoming partly cloudy. Lows around 20.

Partly sunny. A chance of snow in the afternoon. Highs in the upper 20s. Chance of snow 30 percent.

Mostly cloudy with a 30 percent chance of snow. Lows 10 to 15.

Partly sunny with a 40 percent chance of snow. Cold with highs in the lower 20s. Wind chill values as low as zero.

Cloudy with a slight chance of snow. Chance of precipitation 25%. Low temperature around 12F. Dew point will be around 7F with an average humidity of 73%. Winds will be 11 mph from the NW.

Cloudy. High temperature around 20F. Dew point will be around 8F with an average humidity of 68%. Winds will be 11 mph from the W.

Mostly cloudy. Low temperature around 14F. Dew point will be around 9F with an average humidity of 72%. Winds will be 11 mph from the W.

Partly cloudy. High temperature around 22F. Dew point will be around 10F with an average humidity of 67%. Winds will be 12 mph from the W.

Partly cloudy. Low temperature around 17F. Dew point will be around 11F with an average humidity of 73%. Winds will be 11 mph from the W.