Great South Bay Rainfall Forecast

Today 26 May
No Rain
Wed 27 May
15%
Thu 28 May
20%
Fri 29 May
5%
Sat 30 May
20%
Sun 31 May
5%
Mon 1 Jun
20%

Great South Bay Rainfall Statistics

May Rainfall

Islip, Long Island Mac Arthur Airport (8.1 miles)

Total Rainfall 2026
14.6in
Daily Average 2026
0.1in
Wettest Day 23 February, 2026
2in
Wet Days 2026
56/146 (38%)
Total Rainfall April
2.1in
Daily Average April
0.1in
Wettest Day 25 April, 2026
1.1in
Wet Days April
10/30 (33%)
Total Rainfall May
1.5in
Daily Average May
0.1in
Wettest Day 20 May, 2026
0.4in
Wet Days May
10/26 (38%)

Climate (2010–Present)

Islip, Long Island Mac Arthur Airport (8.1 miles)

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Annual Average 2021–2025
44.1in
Monthly Average 2021–2026
3.6in
Daily Average 2021–2026
0.1in
Wettest Day 16 July, 2023
4.6in

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