10-Day Weather Forecast - Port Jefferson, NY

Sunny. Highs in the lower 70s. Northeast winds 5 to 10 mph.

Mostly clear. Lows around 60. Northwest winds around 5 mph.

Sunny. Highs in the mid 70s. Northwest winds 5 to 10 mph.

Mostly clear in the evening, then becoming partly cloudy. Lows around 60.

Mostly sunny. Highs in the upper 70s.

Mostly cloudy. Lows in the mid 60s.

Mostly sunny. Highs around 80.

Partly cloudy. Lows in the upper 60s.

Mostly sunny. Highs in the lower 80s.

Partly cloudy in the evening, then becoming mostly cloudy. Lows in the lower 60s.

Mostly sunny. Highs in the mid 70s.

Partly cloudy. Low temperature around 59F. Dew point will be around 53F with an average humidity of 70%. Winds will be 4 mph from the NW.

Sunny. High temperature around 72F. Dew point will be around 54F with an average humidity of 63%. Winds will be 2 mph from the N.

Clear. Low temperature around 62F. Dew point will be around 56F with an average humidity of 74%. Winds will be 2 mph from the S.

Sunny. High temperature around 74F. Dew point will be around 55F with an average humidity of 62%. Winds will be 2 mph from the S.

Clear. Low temperature around 64F. Dew point will be around 58F with an average humidity of 76%. Winds will be 4 mph from the S.

Mostly sunny. High temperature around 77F. Dew point will be around 59F with an average humidity of 66%. Winds will be 4 mph from the SW.

Clear. Low temperature around 65F. Dew point will be around 60F with an average humidity of 78%. Winds will be 3 mph from the S.