Bellport Bay - John Boyle Island Weather Forecast
- 71
- 80
Chance Thunderstorms
- 67
- 78
Mostly Sunny
- 68
- 74
Mostly Sunny
- 71
- 77
Partly Sunny
- 74
- 79
Partly Sunny
- 74
- 81
Slight Chance Rain Showers
Today 20 Jul Southwest Suffolk
Mostly cloudy in the Morning, then becoming partly sunny. Patchy fog in the morning. A chance of Showers with a slight chance of Thunderstorms. Humid with Highs in the mid 80s. Southwest Winds 5 to 10 Mph. Gusts up to 20 Mph in the afternoon. Chance of rain 40 percent. Heat index Values in the upper 90s.
Tonight 20 Jul Southwest Suffolk
Mostly cloudy with a chance of Showers and Thunderstorms in the Evening, then mostly clear after midnight. Some Thunderstorms may produce gusty Winds in the evening. Humid with Lows in the lower 70s. West Winds 5 to 10 Mph with Gusts up to 20 Mph, becoming northwest after midnight. Chance of rain 40 percent.
Bellport Bay - John Boyle Island Temperature Statistics
July Temperature
Shirley, Brookhaven Airport (5.6 miles)
Lowest 5 July, 2025
59.6 °FAverage July
77.2 °FHighest 8 July, 2025
90.6 °F
Climate (2020–Present)
Shirley, Brookhaven Airport (5.6 miles)
Average Low 2020–2025
46.8 °FAverage 2020–2025
55 °FAverage High 2020–2025
63 °F