Islip, NY
New York · Records since 1963–2026
Records for August 11
🔥 Record High
August 11, 2005
+11° from 82° normal❄ Record Low
August 11, 1972
-18° from 67° normalAll-Time Records — Islip
Top 10 Record Highs — August 11
| # | Temp | Date |
|---|---|---|
| 🏆 | 93°F | August 11, 2005 |
| 2 | 91°F | August 11, 2016 |
| 3 | 89°F | August 11, 2025 |
| 4 | 89°F | August 11, 2010 |
| 5 | 89°F | August 11, 1998 |
| 6 | 89°F | August 11, 1988 |
| 7 | 89°F | August 11, 1977 |
| 8 | 88°F | August 11, 2022 |
| 9 | 88°F | August 11, 2009 |
| 10 | 88°F | August 11, 1980 |
Top 5 Record Lows — August 11
| # | Temp | Date |
|---|---|---|
| 🥶 | 49°F | August 11, 1972 |
| 2 | 53°F | August 11, 1974 |
| 3 | 53°F | August 11, 1968 |
| 4 | 58°F | August 11, 2019 |
| 5 | 58°F | August 11, 2007 |
Heat Wave Summary — Islip
threshold: 88°F (90th percentile of historical Jun–Aug highs)2026 Daily High Temperature vs Normal
Year to date94 of 222 days with data were above the 1991–2020 normal high for their date.
Days ≥ 90°F Per Year
1964–2026Average Daily High by Decade
Full year · complete decades only
Longest Heat Waves — Islip
| # | Dates | Days | Peak | Avg High | Avg Overnight Low |
|---|---|---|---|---|---|
| 🏆 | Jul 29, 2006 – Aug 5, 2006 | 8 | 98°F (Aug 2) | 93°F | 74°F |
| 2 | Aug 28, 1973 – Sep 4, 1973 | 8 | 96°F (Aug 30) | 92°F | 70°F |
| 3 | Aug 2, 1980 – Aug 9, 1980 | 8 | 94°F (Aug 9) | 90°F | 74°F |
| 4 | Jul 18, 1991 – Jul 24, 1991 | 7 | 101°F (Jul 21) | 93°F | 73°F |
| 5 | Jul 7, 1993 – Jul 13, 1993 | 7 | 98°F (Jul 10) | 93°F | 72°F |
| 6 | Jul 12, 1997 – Jul 18, 1997 | 7 | 96°F (Jul 15) | 92°F | 69°F |
| 7 | Jul 14, 2013 – Jul 20, 2013 | 7 | 95°F (Jul 18) | 93°F | 76°F |
| 8 | Jul 3, 1999 – Jul 8, 1999 | 6 | 102°F (Jul 5) | 95°F | 74°F |
| 9 | Aug 11, 2016 – Aug 16, 2016 | 6 | 97°F (Aug 14) | 92°F | 76°F |
| 10 | Jul 16, 1977 – Jul 21, 1977 | 6 | 96°F (Jul 20) | 92°F | 72°F |
Heat Waves Per Year
Warm Summer Nights (Jun–Aug)
Nights where the overnight low exceeded the 1991–2020 normal low
Above-Normal Summer Nights Per Year
Average June–August Low by Decade
Overnight lows · complete decades only
Precipitation
Actual vs. 1991–2020 full-month and full-season normals
Monthly Precipitation — Last 24 Months
Blue = actual · dashed line = monthly normal
Annual Precipitation Per Year (1970–2026)
Blue = above average · tan = below average · gold = 2026 (partial)
Heavy Rain Days Per Year (≥ 1.0")
Compare year-to-year changes in days with heavy rainfall (≥ 1.0")
Month in Review — July 2026
Average temperature · July 2026
50th-warmest month on record
32nd-warmest July of 63 on record
-0.6° vs. 75.0° average (1991–2020)Longest 90°F Streak in July
3 consecutive days with highs of at least 90°F (Jul 2–4, 2026, peaking at 98°F)
Ties the longest July streak since 2025 (1 year). The July record is 7 days, set in 2013.
Average July Temperature by Year
1964–2026 · 2026 highlighted
Warmest Julys on Record
| # | Year | Avg Temp |
|---|---|---|
| 1 | 1999 | 78.6°F |
| 2 | 2025 | 78.6°F |
| 3 | 2019 | 78.1°F |
| 4 | 2010 | 78.0°F |
| 5 | 2013 | 78.0°F |
| 6 | 2020 | 77.7°F |
| 7 | 2011 | 77.7°F |
| 8 | 1994 | 77.3°F |
| 9 | 2022 | 77.2°F |
| 10 | 2023 | 77.1°F |
Warmest Months on Record (Any Month)
| # | Month | Avg Temp |
|---|---|---|
| 1 | July 1999 | 78.6°F |
| 2 | July 2025 | 78.6°F |
| 3 | July 2019 | 78.1°F |
| 4 | July 2010 | 78.0°F |
| 5 | July 2013 | 78.0°F |
| 6 | July 2020 | 77.7°F |
| 7 | August 2022 | 77.7°F |
| 8 | July 2011 | 77.7°F |
| 9 | August 1980 | 77.4°F |
| 10 | August 2016 | 77.3°F |
Nearby Stations — July 2026
How the same month ranked at the closest reporting stations
| Station | Avg Temp | July Rank |
|---|---|---|
| Islip, NY | 74.4°F | 32nd of 63 |
| New York-Kennedy Airport, NY | 76.7°F | 30th of 78 |
| Bridgeport, CT | 74.8°F | 35th of 79 |
| New York-Central Park, NY | 76.4°F | 77th of 158 |
| Newark, NJ | 78.2°F | 36th of 179 |