Rainfall totals Islip, NY
Through Oct 7, 2026, Islip has received 40.63 inches of rain for the year, according to the official daily climate report. The normal year-to-date total is 34.80 inches. The normal figure is what the city would typically have seen by this point in the calendar. This reading comes from the station gauge at ISLIP/MACARTHUR in the National Weather Service's daily climate report.
as of
Data from Islip Long Island MacArthur Airport, with records back to 1963. Across the record from 1963, 100 percent of days have a reading, with 100 percent in 2025.
Most recent rainfall
0.02 inches of rain fell on Oct 2, 2026, the latest measurable rainfall this year.
ISLIP/MACARTHUR saw no measurable rain on Oct 7, 2026, according to the National Weather Service daily climate report.
Official rainfall report for Oct 7, 2026
| Measured | Normal | vs normal | |
|---|---|---|---|
| Rain on Oct 7, 2026 | 0.00 inches | 0.13 inches | -0.13 inches |
| Last 48 hours | 0.00 inches | ||
| Last 72 hours | 0.00 inches | ||
| Last 7 days | 0.24 inches | ||
| Month to date | 0.24 inches | 0.90 inches | -0.66 inches (-73%) |
| Year to date | 40.63 inches | 34.80 inches | +5.83 inches (+17%) |
| Record for Oct 7 | 4.53 inches | 1972 |
Source: National Weather Service daily climate report for ISLIP/MACARTHUR, issued the morning after Oct 7, 2026. The local National Weather Service office issues the daily climate report for the airport station the next morning, and that report is the official figure.
How much rain did Islip get?
Days with measurable rain, 2026
| Date | Rainfall |
|---|---|
| Oct 2, 2026 | 0.02 inches |
| Sep 28, 2026 | 0.47 inches |
| Sep 27, 2026 | 1.92 inches |
| Sep 26, 2026 | 1.40 inches |
| Sep 25, 2026 | 0.25 inches |
| Sep 21, 2026 | 0.27 inches |
| Sep 20, 2026 | 0.24 inches |
| Sep 13, 2026 | 3.06 inches |
| Sep 10, 2026 | 0.03 inches |
| Sep 4, 2026 | 0.04 inches |
| Sep 3, 2026 | 0.03 inches |
| Sep 2, 2026 | 0.10 inches |
| Sep 1, 2026 | 0.95 inches |
| Aug 30, 2026 | 0.02 inches |
| Aug 27, 2026 | 0.22 inches |
| Aug 23, 2026 | 0.67 inches |
| Aug 21, 2026 | 0.41 inches |
| Aug 20, 2026 | 3.27 inches |
| Aug 17, 2026 | 0.66 inches |
| Aug 16, 2026 | 0.04 inches |
| Aug 13, 2026 | 0.08 inches |
| Aug 10, 2026 | 0.02 inches |
| Aug 7, 2026 | 0.58 inches |
| Aug 5, 2026 | 0.01 inches |
| Aug 3, 2026 | 1.95 inches |
| Aug 1, 2026 | 0.01 inches |
| Jul 30, 2026 | 0.19 inches |
| Jul 29, 2026 | 2.12 inches |
| Jul 21, 2026 | 0.03 inches |
| Jul 18, 2026 | 1.49 inches |
With 3.27 inches on Aug 20, 2026, this is the 30th wettest of the 7,341 measurable rain days in the Islip Long Island MacArthur Airport record, which begins in 1963. That is the most rain recorded at this station on August 20 since 1963.
Through Oct 3, 2026, the GHCN-Daily station record shows 40.41 inches of measurable rain so far this year, falling over a 106-day span. Station observations are from GHCN-Daily, with a 1-3 day lag and quality checks by NOAA.
Islip rainfall by month, 2026
| Month | Rainfall | Normal | vs normal |
|---|---|---|---|
| January | 2.58 inches | 3.66 inches | -1.08 inches (-30%) |
| February | 3.66 inches | 3.29 inches | +0.37 inches (+11%) |
| March | 4.19 inches | 4.51 inches | -0.32 inches (-7%) |
| April | 2.15 inches | 4.06 inches | -1.91 inches (-47%) |
| May | 2.68 inches | 3.28 inches | -0.60 inches (-18%) |
| June | 0.82 inches | 4.00 inches | -3.18 inches (-79%) |
| July | 7.61 inches | 3.26 inches | +4.35 inches (+133%) |
| August | 7.94 inches | 4.24 inches | +3.70 inches (+87%) |
| September | 8.76 inches | 3.60 inches | +5.16 inches (+143%) |
| October | 0.02 inches | 3.97 inches |
October is still in progress; figures run through Oct 3, 2026. Averages are 1991-2020 normals from NCEI.
Rainfall days at each threshold in Islip
| Year | 0.5+ in. | 1+ in. | 2+ in. | 3+ in. |
|---|---|---|---|---|
| 2025 | 21 | 10 | 2 | 0 |
| 2024 | 30 | 18 | 3 | 0 |
| 2023 | 28 | 17 | 3 | 2 |
| 2022 | 30 | 8 | 0 | 0 |
| 2021 | 31 | 14 | 3 | 1 |
| 2020 | 28 | 8 | 2 | 0 |
| 2019 | 38 | 10 | 1 | 0 |
| 2018 | 46 | 26 | 1 | 1 |
| 2017 | 27 | 11 | 1 | 1 |
| 2016 | 29 | 7 | 1 | 0 |
| Average | 30.2 | 11.7 | 2.5 | 0.6 |
A day counts when its rainfall total meets or passes the column amount, from Islip Long Island MacArthur Airport records in GHCN-Daily. Every complete year starting with 1963 counts toward the average, 62 years in total.
Past rainfall years in Islip
All-time rainfall records
| Wettest day | 13.51 inches | Aug 13, 2014 |
|---|---|---|
| Wettest year | 65.32 inches | 1989 |
| Driest year | 25.27 inches | 1965 |
| Average year | 45.02 inches | 62 complete years on record |
| Rain days a year | 116 | average, 0.01 inch or more |
| Record begins | 1963 | 23,012 daily readings |
Monthly rainfall normals
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Inches | 3.66 | 3.29 | 4.51 | 4.06 | 3.28 | 4.00 | 3.26 | 4.24 | 3.60 | 3.97 | 3.41 | 4.71 | 45.99 |
Averages are 1991-2020 normals from NCEI.
The daily climate report is issued by the local National Weather Service forecast office and delivered to this page by the Iowa Environmental Mesonet of Iowa State University. Under 17 U.S.C. 105, no copyright attaches to the government-produced figures on this page, including reports, alerts, station observations, and normals, which were created by the National Weather Service and other NOAA offices. The notice that 17 U.S.C. 403 requires appears in this sentence. It does not imply endorsement by or affiliation with those agencies. See: Data sources and attribution.