Philadelphia Center City, PA

Pennsylvania · Records since 1940–2026

☀️ 79°F
Currently in Philadelphia Center City
As of 2:15 PM EDT

Records for September 7

🔥 Record High

96°F

September 7, 2023

+13° from 83° normal

❄ Record Low

54°F

September 7, 2000

-12° from 66° normal
🌞 Normal high: 83°F 🌑 Normal low: 66°F 1991–2020 normals

All-Time Records — Philadelphia Center City

🔥
107°F
Hottest Day Ever
Jul 3, 1966
❄
-5°F
Coldest Day Ever
Jan 19, 1994
🌧
7.50"
Wettest Day Ever
Sep 28, 2004
☃
24.0"
Most Snow in One Day
Jan 8, 1996

Top 10 Record Highs — September 7

# Temp Date
🏆 96°F September 7, 2023
2 96°F September 7, 2018
3 94°F September 7, 2014
4 94°F September 7, 1985
5 93°F September 7, 1998
6 92°F September 7, 1983
7 92°F September 7, 1943
8 91°F September 7, 1969
9 91°F September 7, 1954
10 90°F September 7, 2025

Top 5 Record Lows — September 7

# Temp Date
🥶 54°F September 7, 2000
2 54°F September 7, 1962
3 55°F September 7, 1984
4 56°F September 7, 2013
5 56°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 1940–2026. Climate normals represent the 1991–2020 average.

Heat Wave Summary — Philadelphia Center City

threshold: 94°F (90th percentile of historical Jun–Aug highs)
4.1
Avg heat wave length
days (historical)
99°
Avg peak temp
during heat waves
59
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

109 of 234 days with data were above the 1991–2020 normal high for their date.

Days ≥ 90°F Per Year

1940–2026
43
2026 so far
30
Avg/year 1970–2025
45
Avg/year (last 10 complete)
73
Most in a year (2005)

Average Daily High by Decade

Full year · complete decades only

Longest Heat Waves — Philadelphia Center City

# Dates Days Peak Avg High Avg Overnight Low
🏆 Jul 28, 2002 – Aug 5, 2002 9 102°F (Aug 2) 98°F 78°F
2 Aug 11, 2002 – Aug 19, 2002 9 102°F (Aug 13) 98°F 78°F
3 Aug 27, 1973 – Sep 3, 1973 8 102°F (Aug 28) 98°F 79°F
4 Aug 27, 1953 – Sep 3, 1953 8 100°F (Aug 30) 98°F 78°F
5 Jun 30, 2018 – Jul 6, 2018 7 101°F (Jul 3) 98°F 78°F
6 Jun 7, 1984 – Jun 13, 1984 7 99°F (Jun 9) 98°F 76°F
7 Jul 19, 2022 – Jul 25, 2022 7 99°F (Jul 24) 97°F 79°F
8 Jul 13, 1997 – Jul 18, 1997 6 100°F (Jul 15) 98°F 78°F
9 Jul 16, 2013 – Jul 21, 2013 6 99°F (Jul 19) 97°F 80°F
10 Aug 12, 2016 – Aug 17, 2016 6 99°F (Aug 13) 97°F 79°F

Heat Waves Per Year

Warm Summer Nights (Jun–Aug)

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

50
2026 total
above-normal nights
42.0
Avg / summer
1970–2020
66
Most in a summer
2005

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

11.03"
2026 YTD
Normal: 35.06"
-24.03"
0.00"
September so far
September normal: 4.88"
-4.88"
5
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 Center City is 24.03" behind the normal pace

Monthly Precipitation — Last 24 Months

Blue = actual · dashed line = monthly normal

Annual Precipitation Per Year (1940–2026)

Blue = above average · tan = below average · gold = 2026 (partial)
Since 1940, annual totals have trended +0.29" per decade, about +2.4" 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

79.7°F

Average temperature · August 2026

46th-warmest month on record

13th-warmest August of 87 on record

+1.4° vs. 78.3° average (1991–2020)
83.9°F
Warmest month ever
July 1999
83.2°F
Warmest August ever
2005
15
Days ≥ 90°F
in August
104°F
Hottest of 2026
Jul 3

Longest 90°F Streak in August

10 consecutive days with highs of at least 90°F (Aug 7–16, 2026, peaking at 96°F)

Ties the longest August streak since 2022 (4 years). The August record is 15 days, set in 1988.

Average August Temperature by Year

1940–2026 · 2026 highlighted · trend +0.48° per decade (warming since 1940)

Precipitation — August 2026

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

5.61"
Total precipitation
August 2026
+0.37"
vs. average
Normal: 5.24" · 107% of normal
20th-wettest
August rank
of 54 on record
16.70"
Wettest August ever
2011 · driest 0.32" (1964)

August Precipitation by Year

1940–2026 · 2026 highlighted · trend +0.10" per decade (wetter since 1940)

Wettest Augusts on Record

# Year Total
1 2011 16.70"
2 1977 10.86"
3 2009 9.38"
4 2020 9.16"
5 1955 8.93"
6 1999 8.42"
7 1978 8.38"
8 1940 7.87"
9 2004 7.76"
10 2006 7.64"

Driest Augusts on Record

# Year Total
1 1964 0.32"
2 1951 0.54"
3 2010 1.08"
4 1995 1.23"
5 1957 1.32"
6 2015 1.58"
7 1975 1.63"
8 2008 1.69"
9 2001 1.92"
10 2025 2.11"

Warmest Augusts on Record

# Year Avg Temp
1 2005 83.2°F
2 2016 81.6°F
3 2022 81.6°F
4 2002 81.5°F
5 2018 81.5°F
6 1973 80.9°F
7 2003 80.9°F
8 2001 80.8°F
9 2021 80.3°F
10 1998 80.3°F

Warmest Months on Record (Any Month)

# Month Avg Temp
1 July 1999 83.9°F
2 July 2006 83.4°F
3 July 2011 83.4°F
4 August 2005 83.2°F
5 July 2005 83.1°F
6 July 2025 82.8°F
7 July 2024 82.7°F
8 July 2022 82.7°F
9 July 2010 82.6°F
10 July 2002 82.1°F

Nearby Stations — August 2026

How the same month ranked at the closest reporting stations

Station Avg Temp August Rank
Philadelphia Center City, PA 79.7°F 13th of 87
Philadelphia, PA 79.2°F 8th of 153
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 1,012 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 54 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 20
so far
 Sep 6 Aug 8, 2011 Oct 6, 1941 -0.3 d/decade
Last 80°F day
The last genuinely warm afternoon
 Aug 31
so far
 Oct 10 Sep 20, 1976 Nov 9, 1975 -0.1 d/decade
First high below 50°F
The first afternoon that stays cold
 not yet Nov 6 Oct 10, 1979 Nov 28, 1948 +0.7 d/decade
First 32°F freeze
Growing season over
 not yet Nov 22 Oct 19, 1940 Dec 22, 2001 +0.8 d/decade
First 28°F hard freeze
Cold enough to end tender growth
 not yet Dec 2 Nov 4, 1951 Dec 31, 1997 +0.3 d/decade
First 20°F night
Winter cold arriving
 not yet Dec 19 Nov 21, 1987 Dec 31, 1997 +0.7 d/decade
First measurable snow
0.1" or more in a day
 not yet Dec 13 Oct 19, 1940 Dec 30, 2012 +1.8 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 1940 · trending +0.8 days later per decade

236
Normal length
1991–2020 average
274
Longest on record
1998
209
Shortest on record
1976

Growing Season Length by Year

Days between the last spring freeze and the first fall freeze · trending -0.2 days shorter per decade

Fall Average Temperature by Year

1940–2025 · 2026 highlighted · trend +0.23° per decade (warming since 1940)

Fall Precipitation by Year

1940–2024 · 2026 highlighted · trend +0.24" per decade (wetter since 1940)

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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