Brentwood Weather Forecast
- 66
- 84
Mostly Sunny
- 72
- 83
Chance Thunderstorms
- 68
- 87
Chance Thunderstorms
- 66
- 82
Mostly Sunny
- 68
- 82
Partly Sunny
- 71
- 85
Slight Chance Rain Showers
- 74
- 88
Mostly Cloudy
Today 18 Jul Southwest Suffolk
Partly sunny. Highs in the lower 80s. Northwest Winds 5 to 10 Mph with Gusts up to 20 Mph.
Tonight 18 Jul Southwest Suffolk
Partly cloudy in the Evening, then clearing. Lows in the mid 60s. Northwest Winds around 5 Mph.
Brentwood Temperature Statistics
July Temperature
Islip, Long Island Mac Arthur Airport (7.5 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 (7.5 miles)
Average Low 2020–2025
47.5 °FAverage 2020–2025
55.2 °FAverage High 2020–2025
63 °F