Stony Brook Weather Forecast
- 69
- 83
Decreasing Clouds
- 72
- 83
Chance Rain Showers
- 68
- 87
Chance Thunderstorms
- 65
- 82
Mostly Sunny
- 68
- 81
Partly Sunny
- 71
- 83
Slight Chance Rain Showers
Today 18 Jul Northwest Suffolk
Mostly sunny. Highs in the mid 80s. Northwest Winds 10 to 15 Mph.
Tonight 18 Jul Northwest Suffolk
Mostly clear. Lows in the lower 70s. Northwest Winds 10 to 15 Mph with Gusts up to 25 Mph.
Stony Brook Temperature Statistics
July Temperature
Islip, Long Island Mac Arthur Airport (8.7 miles)
Lowest 5 July, 2025
64.7 °FAverage July
77.6 °FHighest 8 July, 2025
92.6 °F
Climate (2020–Present)
Islip, Long Island Mac Arthur Airport (8.7 miles)
Average Low 2020–2025
47.5 °FAverage 2020–2025
55.2 °FAverage High 2020–2025
63 °F