Philadelphia, PA

Pennsylvania · Records since 1873–2026

☀️ 80°F
Currently in Philadelphia
As of 2:00 PM EDT

Records for September 7

🔥 Record High

102°F

September 7, 1881

+20° from 82° normal

❄ Record Low

47°F

September 7, 1984

-17° from 64° normal
🌞 Normal high: 82°F 🌑 Normal low: 64°F 1991–2020 normals

All-Time Records — Philadelphia

🔥
106°F
Hottest Day Ever
Aug 7, 1918
❄
-11°F
Coldest Day Ever
Feb 9, 1934
🌧
8.02"
Wettest Day Ever
Jul 28, 2013
☃
27.6"
Most Snow in One Day
Jan 7, 1996

Top 10 Record Highs — September 7

# Temp Date
🏆 102°F September 7, 1881
2 97°F September 7, 2023
3 92°F September 7, 1983
4 92°F September 7, 1954
5 92°F September 7, 1943
6 92°F September 7, 1884
7 91°F September 7, 2016
8 91°F September 7, 1985
9 91°F September 7, 1978
10 91°F September 7, 1941

Top 5 Record Lows — September 7

# Temp Date
🥶 47°F September 7, 1984
2 47°F September 7, 1962
3 48°F September 7, 1963
4 50°F September 7, 1976
5 50°F September 7, 1888
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 1873–2026. Climate normals represent the 1991–2020 average.

Heat Wave Summary — Philadelphia

threshold: 92°F (90th percentile of historical Jun–Aug highs)
4.2
Avg heat wave length
days (historical)
97°
Avg peak temp
during heat waves
63
Dangerous nights 2026
Overnights ≥ 70°F
3
Heat waves 2026
so far

2026 Daily High Temperature vs Normal

Year to date
Above normal Below normal

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

Days ≥ 90°F Per Year

1874–2026
40
2026 so far
22
Avg/year 1970–2025
35
Avg/year (last 10 complete)
55
Most in a year (2010)

Average Daily High by Decade

Full year · complete decades only

Longest Heat Waves — Philadelphia

# Dates Days Peak Avg High Avg Overnight Low
🏆 Jul 22, 1995 – Aug 5, 1995 15 98°F (Aug 2) 94°F 77°F
2 Aug 25, 1953 – Sep 4, 1953 11 101°F (Aug 31) 97°F 72°F
3 Jul 4, 1993 – Jul 14, 1993 11 101°F (Jul 10) 97°F 77°F
4 Jul 16, 1885 – Jul 26, 1885 11 97°F (Jul 18) 94°F 73°F
5 Aug 27, 1973 – Sep 5, 1973 10 99°F (Aug 28) 96°F 74°F
6 Jul 15, 1955 – Jul 23, 1955 9 100°F (Jul 22) 95°F 74°F
7 Aug 11, 2002 – Aug 19, 2002 9 99°F (Aug 13) 95°F 75°F
8 Aug 5, 1896 – Aug 13, 1896 9 97°F (Aug 11) 95°F 75°F
9 Jul 28, 2002 – Aug 4, 2002 8 99°F (Aug 1) 96°F 76°F
10 Jul 18, 2022 – Jul 25, 2022 8 99°F (Jul 24) 96°F 78°F

Heat Waves Per Year

Warm Summer Nights (Jun–Aug)

Nights where the overnight low exceeded the 1991–2020 normal low

65
2026 total
above-normal nights
44.3
Avg / summer
1970–2020
67
Most in a summer
2022

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

32.01"
2026 YTD
Normal: 30.26"
+1.75"
2.28"
September so far
September normal: 4.40"
-2.12"
9
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 · Philadelphia is 1.75" ahead of the normal pace

Monthly Precipitation — Last 24 Months

Blue = actual · dashed line = monthly normal

Annual Precipitation Per Year (1871–2026)

Blue = above average · tan = below average · gold = 2026 (partial)
Since 1871, annual totals have trended +0.30" per decade, about +4.6" 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

79.2°F

Average temperature · August 2026

36th-warmest month on record

8th-warmest August of 153 on record

+2.0° vs. 77.2° average (1991–2020)
82.4°F
Warmest month ever
July 2011
81.3°F
Warmest August ever
2022
13
Days ≥ 90°F
in August
103°F
Hottest of 2026
Jul 2

Longest 90°F Streak in August

5 consecutive days with highs of at least 90°F (Aug 6–10, 2026, peaking at 94°F)

The longest August streak since 2025 (1 year). The August record is 15 days, set in 1988.

Average August Temperature by Year

1874–2026 · 2026 highlighted · trend +0.25° per decade (warming since 1874)

Precipitation — August 2026

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

7.44"
Total precipitation
August 2026
+3.15"
vs. average
Normal: 4.29" · 173% of normal
17th-wettest
August rank
of 155 on record
19.31"
Wettest August ever
2011 · driest 0.46" (1896)

August Precipitation by Year

1872–2026 · 2026 highlighted · trend -0.04" per decade (drier since 1872)

Wettest Augusts on Record

# Year Total
1 2011 19.31"
2 1911 12.10"
3 1873 11.49"
4 2009 10.29"
5 1933 9.84"
6 1955 9.70"
7 1971 9.61"
8 1905 9.57"
9 1906 9.56"
10 1901 9.42"

Driest Augusts on Record

# Year Total
1 1896 0.46"
2 1964 0.49"
3 1895 0.59"
4 1943 0.65"
5 1877 0.66"
6 1980 0.80"
7 1951 0.89"
8 1916 0.94"
9 2001 0.97"
10 2015 0.98"

Warmest Augusts on Record

# Year Avg Temp
1 2022 81.3°F
2 2016 81.1°F
3 1980 79.9°F
4 1995 79.8°F
5 2001 79.8°F
6 2005 79.6°F
7 2002 79.5°F
8 2026 79.2°F
9 1900 79.2°F
10 2021 79.2°F

Warmest Months on Record (Any Month)

# Month Avg Temp
1 July 2011 82.4°F
2 July 2022 82.1°F
3 July 1994 82.1°F
4 July 2020 81.9°F
5 July 2025 81.9°F
6 July 2012 81.8°F
7 July 2010 81.7°F
8 July 1995 81.5°F
9 July 1993 81.4°F
10 July 1955 81.4°F

Nearby Stations — August 2026

How the same month ranked at the closest reporting stations

Station Avg Temp August Rank
Philadelphia, PA 79.2°F 8th of 153
Philadelphia Center City, PA 79.7°F 13th of 87
Wilmington, DE 77.3°F 13th of 113
Trenton, NJ 75.2°F 43rd of 133
Allentown, PA 73.1°F 35th of 104
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 1,832 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 155 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
 Sep 1
so far
 Sep 5 Jul 12, 1889 Oct 10, 1939 +0.6 d/decade
Last 80°F day
The last genuinely warm afternoon
 Sep 6
so far
 Oct 10 Sep 8, 1902 Nov 15, 1993 +0.8 d/decade
First high below 50°F
The first afternoon that stays cold
 not yet Nov 6 Oct 6, 1935 Nov 28, 1948 +0.8 d/decade
First 32°F freeze
Growing season over
 not yet Nov 12 Oct 5, 1961 Dec 11, 1939 -0.2 d/decade
First 28°F hard freeze
Cold enough to end tender growth
 not yet Nov 25 Oct 11, 1964 Dec 22, 2001
First 20°F night
Winter cold arriving
 not yet Dec 15 Nov 7, 1962 Dec 31, 2001 +0.3 d/decade
First measurable snow
0.1" or more in a day
 not yet Dec 10 Oct 10, 1979 Dec 31, 1974 +0.5 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 1874 · trending -0.2 days earlier per decade

226
Normal length
1991–2020 average
267
Longest on record
1931
169
Shortest on record
1966

Growing Season Length by Year

Days between the last spring freeze and the first fall freeze · trending +0.3 days longer per decade

Fall Average Temperature by Year

1874–2025 · 2026 highlighted · trend +0.15° per decade (warming since 1874)

Fall Precipitation by Year

1872–2025 · 2026 highlighted · trend +0.07" per decade (wetter since 1872)

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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