Brentwood Rainfall Forecast

Today 5 Sep
45%
Sat 6 Sep
55%
Sun 7 Sep
80%
Mon 8 Sep
15%
Tue 9 Sep
No Rain
Wed 10 Sep
15%
Thu 11 Sep
10%

Brentwood Rainfall Statistics

September Rainfall

Islip, Long Island Mac Arthur Airport (7.5 miles)

Total Rainfall 2025
23.8in
Daily Average 2025
0.1in
Wettest Day 31 July, 2025
2.9in
Wet Days 2025
82/248 (33%)
Total Rainfall August
0.5in
Daily Average August
0.02in
Wettest Day 20 August, 2025
0.3in
Wet Days August
5/31 (16%)
Total Rainfall September
0in
Daily Average September
0in
Wettest Day 1 September, 2025
0in
Wet Days September
–

Climate (2010–Present)

Islip, Long Island Mac Arthur Airport (7.5 miles)

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Annual Average 2020–2024
45.6in
Monthly Average 2020–2025
3.8in
Daily Average 2020–2025
0.1in
Wettest Day 16 July, 2023
4.6in

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