Islip, NY

New York · Records since 1963–2026

☀️ 78°F
Currently in Islip
As of 1:45 PM EDT

Records for September 7

🔥 Record High

92°F

September 7, 2023

+14° from 78° normal

❄ Record Low

46°F

September 7, 1988

-16° from 62° normal
🌞 Normal high: 78°F 🌑 Normal low: 62°F 1991–2020 normals

All-Time Records — Islip

🔥
104°F
Hottest Day Ever
Jul 3, 1966
❄
-14°F
Coldest Day Ever
Feb 13, 1967
🌧
13.51"
Wettest Day Ever
Aug 13, 2014
☃
23.5"
Most Snow in One Day
Jan 29, 2022

Top 10 Record Highs — September 7

# Temp Date
🏆 92°F September 7, 2023
2 92°F September 7, 1998
3 90°F September 7, 1983
4 85°F September 7, 2015
5 85°F September 7, 1990
6 84°F September 7, 1978
7 83°F September 7, 2012
8 83°F September 7, 1980
9 83°F September 7, 1979
10 83°F September 7, 1969

Top 5 Record Lows — September 7

# Temp Date
🥶 46°F September 7, 1988
2 47°F September 7, 2000
3 48°F September 7, 1984
4 50°F September 7, 1976
5 50°F September 7, 1963
About this data — Records are sourced from the NOAA Threadex dataset via RCC ACIS, a quality-controlled record for long-term climate stations. Threadex adjusts for station relocations and observation-time changes, making records comparable across all years since 1963–2026. Climate normals represent the 1991–2020 average.

Heat Wave Summary — Islip

threshold: 88°F (90th percentile of historical Jun–Aug highs)
4.0
Avg heat wave length
days (historical)
94°
Avg peak temp
during heat waves
23
Dangerous nights 2026
Overnights ≥ 70°F
2
Heat waves 2026
so far

2026 Daily High Temperature vs Normal

Year to date
Above normal Below normal

108 of 249 days with data were above the 1991–2020 normal high for their date.

Days ≥ 90°F Per Year

1964–2026
9
2026 so far
7
Avg/year 1970–2025
9
Avg/year (last 10 complete)
18
Most in a year (1999)

Average 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

45
2026 total
above-normal nights
40.1
Avg / summer
1970–2020
61
Most in a summer
2020

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

32.75"
2026 YTD
Normal: 30.98"
+1.77"
1.12"
September so far
September normal: 3.60"
-2.48"
10
2026 heavy rain days
Days with ≥ 1.0"

2026 Accumulation vs. Normal

Running total since Jan 1 against the normal pace for the same date · Islip is 1.77" ahead of the normal pace

Monthly Precipitation — Last 24 Months

Blue = actual · dashed line = monthly normal

Annual Precipitation Per Year (1963–2026)

Blue = above average · tan = below average · gold = 2026 (partial)
Since 1963, annual totals have trended +1.35" per decade, about +8.4" across the record.

Heavy Rain Days Per Year (≥ 1.0")

Compare year-to-year changes in days with heavy rainfall (≥ 1.0")

Month in Review — August 2026

75.1°F

Average temperature · August 2026

34th-warmest month on record

11th-warmest August of 63 on record

+1.4° vs. 73.7° average (1991–2020)
78.6°F
Warmest month ever
July 1999
77.7°F
Warmest August ever
2022
98°F
Hottest of 2026
Jul 3

Average August Temperature by Year

1964–2026 · 2026 highlighted · trend +0.50° per decade (warming since 1964)

Precipitation — August 2026

Month total against the 1991–2020 average and every other August on record

7.94"
Total precipitation
August 2026
+3.70"
vs. average
Normal: 4.24" · 187% of normal
6th-wettest
August rank
of 62 on record
14.07"
Wettest August ever
2014 · driest 0.18" (1964)

August Precipitation by Year

1964–2026 · 2026 highlighted · trend +0.21" per decade (wetter since 1964)

Wettest Augusts on Record

# Year Total
1 2014 14.07"
2 1990 13.78"
3 2011 11.58"
4 1991 8.68"
5 1976 8.21"
6 2026 7.94"
7 1979 7.70"
8 1989 7.68"
9 2021 6.63"
10 1992 6.62"

Driest Augusts on Record

# Year Total
1 1964 0.18"
2 2005 0.26"
3 1984 0.47"
4 2025 0.53"
5 2022 0.67"
6 2009 0.68"
7 1995 0.74"
8 2016 0.90"
9 1981 1.18"
10 1980 1.45"

Warmest Augusts on Record

# Year Avg Temp
1 2022 77.7°F
2 1980 77.4°F
3 2016 77.3°F
4 2005 77.0°F
5 2018 76.7°F
6 2021 75.9°F
7 1998 75.7°F
8 2015 75.7°F
9 2001 75.6°F
10 2020 75.3°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 — August 2026

How the same month ranked at the closest reporting stations

Station Avg Temp August Rank
Islip, NY 75.1°F 11th of 63
New York-Kennedy Airport, NY 76.4°F 22nd of 79
Bridgeport, CT 74.8°F 23rd of 79
New York-Central Park, NY 75.7°F 55th of 158
Newark, NJ 77.3°F 22nd of 174
About this data. Monthly averages are the mean of daily average temperatures, computed from NOAA Threadex records via RCC ACIS. Months missing more than three days of observations are excluded from the rankings, so the in-progress month never appears. Rankings cover 755 complete months on record. Precipitation totals sum the daily reports for the month, with trace amounts counted as zero. A month missing any day of precipitation data is left out entirely (an unreported day is unreported rain), so the precipitation ranking covers 62 complete Augusts. Normals are the 1991–2020 mean for the same calendar month. Trend lines are a least-squares fit across every year shown.

Fall in Review — Fall 2026

September 1 – November 30, 2026

Fall 2026 is still under way. Season totals and rankings appear once November closes; the markers below update as they happen.

Summer to Winter — 2026

Each turning point of the season against its 1991–2020 normal date, with the earliest and latest on record

Marker 2026 Normal vs. normal Earliest Latest Drift
Last 90°F day
The final day of summer heat
 Aug 9
so far
 Aug 11 May 21, 1996 Sep 22, 1980 +3.0 d/decade
Last 80°F day
The last genuinely warm afternoon
 Sep 5
so far
 Sep 25 Aug 23, 2006 Nov 7, 2022 +3.0 d/decade
First high below 50°F
The first afternoon that stays cold
 not yet Nov 4 Oct 5, 1965 Nov 23, 1994 +1.4 d/decade
First 32°F freeze
Growing season over
 not yet Oct 29 Oct 5, 1965 Nov 15, 1984 +2.0 d/decade
First 28°F hard freeze
Cold enough to end tender growth
 not yet Nov 14 Oct 12, 1964 Dec 8, 1983 +2.5 d/decade
First 20°F night
Winter cold arriving
 not yet Dec 8 Nov 14, 1986 Dec 31, 2001 +1.3 d/decade
First measurable snow
0.1" or more in a day
 not yet Dec 6 Oct 29, 2011 Dec 28, 1980 -1.7 d/decade

Drift is a least-squares fit across every year on record. Positive means the marker has been arriving later.

First Freeze by Year

The first 32°F night of each autumn since 1964 · trending +2.0 days later per decade

199
Normal length
1991–2020 average
230
Longest on record
2024
159
Shortest on record
1968

Growing Season Length by Year

Days between the last spring freeze and the first fall freeze · trending +3.8 days longer per decade

Fall Average Temperature by Year

1964–2025 · 2026 highlighted · trend +0.52° per decade (warming since 1964)

Fall Precipitation by Year

1964–2025 · 2026 highlighted · trend +0.11" per decade (wetter since 1964)

About this data. Fall is meteorological autumn, September 1 through November 30, the window NOAA uses for seasonal statistics. Seasonal temperature is the day-weighted mean of the three monthly means; precipitation is their sum, and a season missing any of the three months is left out of the rankings. Freeze, heat and snow markers come from daily NOAA Threadex observations via RCC ACIS: freezes and snow are the first occurrence on or after July 1, and the last 90°F and 80°F days are the final ones anywhere in the calendar year. Growing season counts the freeze-free days between the last spring 32°F and the first fall 32°F.
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