Pittsburgh, PA

Pennsylvania · Records since 1875–2026

☀️ 78°F Feels like 84°
Currently in Pittsburgh
As of 2:30 PM EDT

Records for September 11

🔥 Record High

97°F

September 11, 1900

+20° from 77° normal

❄ Record Low

38°F

September 11, 1917

-18° from 56° normal
🌞 Normal high: 77°F 🌑 Normal low: 56°F 1991–2020 normals

All-Time Records — Pittsburgh

🔥
103°F
Hottest Day Ever
Jul 16, 1988
❄
-22°F
Coldest Day Ever
Jan 19, 1994
🌧
5.95"
Wettest Day Ever
Sep 17, 2004
☃
23.6"
Most Snow in One Day
Mar 13, 1993

First & Last Dates — Pittsburgh

How early and how late each seasonal turning point has ever arrived, across the full period of record

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Range ever recorded Normal date (1991–2020)
220 days
Longest growing season
1929
138 days
Shortest growing season
1956
177 days
Normal growing season
1991–2020 average

Top 10 Record Highs — September 11

# Temp Date
🏆 97°F September 11, 1900
2 95°F September 11, 1925
3 93°F September 11, 1952
4 93°F September 11, 1897
5 93°F September 11, 1884
6 92°F September 11, 1896
7 92°F September 11, 1895
8 91°F September 11, 1983
9 91°F September 11, 1931
10 90°F September 11, 2019

Top 5 Record Lows — September 11

# Temp Date
🥶 38°F September 11, 1917
2 41°F September 11, 1967
3 42°F September 11, 1969
4 42°F September 11, 1924
5 43°F September 11, 1940
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 1875–2026. Climate normals represent the 1991–2020 average.

Heat Wave Summary — Pittsburgh

threshold: 90°F (90th percentile of historical Jun–Aug highs)
4.3
Avg heat wave length
days (historical)
94°
Avg peak temp
during heat waves
11
Dangerous nights 2026
Overnights ≥ 70°F
1
Heat waves 2026
so far

Days ≥ 90°F Per Year

1875–2026
7
2026 so far
13
Avg/year 1970–2025
10
Avg/year (last 10 complete)
50
Most in a year (1881)

Average Daily High by Decade

Full year · complete decades only

Longest Heat Waves — Pittsburgh

# Dates Days Peak Avg High Avg Overnight Low
🏆 Jul 4, 1988 – Jul 16, 1988 13 103°F (Jul 16) 95°F 66°F
2 Jul 3, 1881 – Jul 14, 1881 12 103°F (Jul 10) 94°F 72°F
3 Jun 30, 1878 – Jul 10, 1878 11 97°F (Jul 3) 94°F 70°F
4 Jul 16, 1885 – Jul 25, 1885 10 99°F (Jul 21) 95°F 71°F
5 Aug 26, 1953 – Sep 4, 1953 10 97°F (Aug 30) 95°F 66°F
6 Aug 27, 1973 – Sep 5, 1973 10 92°F (Aug 28) 91°F 69°F
7 Sep 3, 1884 – Sep 11, 1884 9 100°F (Sep 10) 96°F 69°F
8 Jul 2, 1897 – Jul 10, 1897 9 99°F (Jul 5) 93°F 71°F
9 Jul 8, 1936 – Jul 15, 1936 8 102°F (Jul 14) 97°F 71°F
10 Aug 5, 1900 – Aug 12, 1900 8 98°F (Aug 11) 95°F 71°F

Heat Waves Per Year

Warm Summer Nights (Jun–Aug)

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

59
2026 total
above-normal nights
43.5
Avg / summer
1970–2020
76
Most in a summer
1898

Above-Normal Summer Nights Per Year

Average June–August Low by Decade

Overnight lows · complete decades only

Precipitation

Annual totals and trend across the full period of record · see this year's standing →

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 +0.28" per decade, about +4.4" across the record.

Heavy Rain Days Per Year (≥ 1.0")

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

This Year — 2026

How Pittsburgh is tracking against normal, year to date

Daily High Temperature vs Normal

Above normal Below normal

128 of 253 days with data were above the 1991–2020 normal high for their date.

Precipitation, Year to Date

37.18"
2026 YTD
Normal: 28.90"
+8.28"
3.56"
September so far
September normal: 3.30"
+0.26"
13
2026 heavy rain days
Days with ≥ 1.0"

Accumulation vs. Normal

Running total since Jan 1 against the normal pace for the same date · Pittsburgh is 8.28" ahead of the normal pace

Period Review — Aug 11 – Sep 10, 2026

Any window, evaluated against every other year on record — 31 days

Quick picks: Last 7 days Last 30 days Last 90 days This month
Seasons: Spring (Mar–May) Summer (Jun–Aug) Fall (Sep–Nov)
72.3°F
Average temperature
40th-warmest of 152
+1.5°
vs. average
Normal: 70.8°F (1991–2020)
7.55"
Precipitation
6th-wettest of 156
+3.98"
vs. average
Normal: 3.57" · 211% of normal

Average Temperature by Year — Aug 11 – Sep 10

1875–2026 · 2026 highlighted · trend -0.09° per decade (cooling since 1875)

Precipitation by Year — Aug 11 – Sep 10

1871–2026 · 2026 highlighted · trend +0.04" per decade (wetter since 1871)

Warmest Aug 11 – Sep 10 on Record

# Year Avg Temp
1 1900 79.1°F
2 1881 77.7°F
3 1947 76.8°F
4 1884 76.3°F
5 1959 76.0°F
6 1995 75.1°F
7 1993 75.1°F
8 2016 75.0°F
9 1898 75.0°F
10 1880 74.4°F

Coolest Aug 11 – Sep 10 on Record

# Year Avg Temp
1 1976 65.1°F
2 1963 65.7°F
3 1967 66.0°F
4 1986 66.1°F
5 1946 66.5°F
6 1984 66.7°F
7 1997 66.7°F
8 1982 66.7°F
9 1958 67.0°F
10 1964 67.4°F

Wettest Aug 11 – Sep 10 on Record

# Year Total
1 2004 8.65"
2 2021 8.65"
3 2018 8.39"
4 1888 7.66"
5 1911 7.66"
6 2026 7.55"
7 1941 7.53"
8 1990 7.10"
9 1975 6.95"
10 1926 6.81"

Driest Aug 11 – Sep 10 on Record

# Year Total
1 1881 0.19"
2 1953 0.55"
3 1957 0.57"
4 1986 0.60"
5 1948 0.73"
6 1995 0.83"
7 1875 0.86"
8 1976 0.93"
9 1951 0.93"
10 1937 0.97"
About this data. Pick any start and end date and this becomes the same kind of review as the Month and Fall tabs, just for exactly the window you asked for — the generalized version of the same engine, evaluated across every year on record. Average temperature is the mean of each day's (high + low) / 2; precipitation is the sum of daily totals. A year missing more than about a fifth of the window's days is excluded from the temperature ranking; any missing day excludes a year from the precipitation ranking, since an unreported day is unreported rain. Ranges that cross from December into January aren't supported yet. Normals are the 1991–2020 mean for the same window.
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