10-Day Weather Forecast - Port Jefferson, NY

Sunny. Highs in the mid 80s. Southwest winds 5 to 10 mph. Gusts up to 20 mph in the afternoon.

Clear. Lows around 70. Southwest winds 10 to 15 mph.

Sunny. Highs in the lower 90s. Southwest winds 10 to 15 mph. Gusts up to 25 mph in the afternoon. Heat index values in the upper 90s.

Mostly clear. Lows in the mid 70s.

Sunny hot with highs in the mid 90s. Heat index values up to 105.

Partly cloudy. Lows in the lower 70s.

Mostly sunny. Highs in the upper 80s.

Partly cloudy. Lows in the lower 70s.

Mostly sunny. Highs in the upper 80s.

Partly cloudy. Lows in the lower 70s.

Mostly sunny. Highs in the upper 80s.

Partly cloudy with a 35% chance for rain and thunderstorms. Low temperature around 67F. Dew point will be around 68F with an average humidity of 91%. Winds will be 3 mph from the S.

Mostly sunny with a chance of rain. Chance of precipitation 35%. High temperature around 82F. Dew point will be around 66F with an average humidity of 67%. Winds will be 3 mph from the S.

Partly cloudy with a chance of rain. Chance of precipitation 45%. Low temperature around 70F. Dew point will be around 66F with an average humidity of 80%. Winds will be 6 mph from the S.

Sunny with a chance of rain. Chance of precipitation 35%. High temperature around 84F. Dew point will be around 70F with an average humidity of 73%. Winds will be 5 mph from the S.

Mostly clear with a chance of rain. Chance of precipitation 50%. Low temperature around 70F. Dew point will be around 68F with an average humidity of 84%. Winds will be 5 mph from the S.

Mostly sunny with a chance of rain. Chance of precipitation 40%. High temperature around 82F. Dew point will be around 70F with an average humidity of 75%. Winds will be 3 mph from the S.

Mostly clear with a chance of rain. Chance of precipitation 50%. Low temperature around 69F. Dew point will be around 69F with an average humidity of 88%. Winds will be 3 mph from the S.