Williamsport, PA

Pennsylvania · Records since 1895–2026

☁️ 58°F Feels like 55°
Currently in Williamsport
As of 10:15 PM EDT

Records for September 26

🔥 Record High

92°F

September 26, 1900

+21° from 71° normal

❄ Record Low

31°F

September 26, 1943

-19° from 50° normal
🌞 Normal high: 71°F 🌑 Normal low: 50°F 1991–2020 normals

All-Time Records — Williamsport

🔥
106°F
Hottest Day Ever
Jul 9, 1936
❄
-20°F
Coldest Day Ever
Jan 21, 1994
🌧
8.66"
Wettest Day Ever
Jun 22, 1972
☃
23.0"
Most Snow in One Day
Feb 22, 1902

First & Last Dates — Williamsport

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)
217 days
Longest growing season
1970
122 days
Shortest growing season
1963
173 days
Normal growing season
1991–2020 average

Top 10 Record Highs — September 26

# Temp Date
🏆 92°F September 26, 1900
2 91°F September 26, 2017
3 90°F September 26, 2007
4 87°F September 26, 1930
5 87°F September 26, 1920
6 86°F September 26, 1970
7 85°F September 26, 1958
8 85°F September 26, 1933
9 84°F September 26, 1929
10 83°F September 26, 1908

Top 5 Record Lows — September 26

# Temp Date
🥶 31°F September 26, 1943
2 32°F September 26, 1947
3 32°F September 26, 1932
4 35°F September 26, 1936
5 35°F September 26, 1925
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 1895–2026. Climate normals represent the 1991–2020 average.

Heat Wave Summary — Williamsport

threshold: 91°F (90th percentile of historical Jun–Aug highs)
4.3
Avg heat wave length
days (historical)
96°
Avg peak temp
during heat waves
13
Dangerous nights 2026
Overnights ≥ 70°F
1
Heat waves 2026
so far

Days ≥ 90°F Per Year

1895–2026
14
2026 so far
16
Avg/year 1970–2025
22
Avg/year (last 10 complete)
42
Most in a year (1988)

Average Daily High by Decade

Full year · complete decades only

Longest Heat Waves — Williamsport

# Dates Days Peak Avg High Avg Overnight Low
🏆 Jul 4, 1988 – Jul 18, 1988 15 103°F (Jul 16) 97°F 64°F
2 Jul 14, 1955 – Jul 23, 1955 10 100°F (Jul 21) 95°F 64°F
3 Aug 27, 1953 – Sep 4, 1953 9 102°F (Sep 3) 98°F 64°F
4 Jun 18, 1923 – Jun 26, 1923 9 101°F (Jun 20) 97°F 65°F
5 Jul 17, 2011 – Jul 24, 2011 8 103°F (Jul 22) 95°F 70°F
6 Aug 2, 1930 – Aug 9, 1930 8 102°F (Aug 4) 98°F 63°F
7 Aug 10, 1944 – Aug 17, 1944 8 101°F (Aug 13) 96°F 65°F
8 Jul 16, 1991 – Jul 23, 1991 8 101°F (Jul 19) 97°F 65°F
9 Jul 7, 1993 – Jul 14, 1993 8 98°F (Jul 10) 95°F 68°F
10 Aug 11, 2002 – Aug 18, 2002 8 96°F (Aug 12) 93°F 66°F

Heat Waves Per Year

Warm Summer Nights (Jun–Aug)

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

47
2026 total
above-normal nights
43.9
Avg / summer
1970–2020
75
Most in a summer
1901

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 (1895–2026)

Blue = above average · tan = below average · gold = 2026 (partial)
Since 1895, annual totals have trended +0.51" per decade, about +6.6" 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 Williamsport is tracking against normal, year to date

Daily High Temperature vs Normal

Above normal Below normal

126 of 267 days with data were above the 1991–2020 normal high for their date.

Precipitation, Year to Date

34.27"
2026 YTD
Normal: 32.54"
+1.73"
6.37"
September so far
September normal: 4.76"
+1.61"
8
2026 heavy rain days
Days with ≥ 1.0"

Accumulation vs. Normal

Running total since Jan 1 against the normal pace for the same date · Williamsport is 1.73" ahead of the normal pace

Period Review — Jun 27 – Sep 25, 2026

Any window, evaluated against every other year on record — 91 days

Quick picks: Last 7 days Last 30 days Last 90 days This month
Seasons: Spring (Mar–May) Summer (Jun–Aug) Fall (Sep–Nov)
72.2°F
Average temperature
16th-warmest of 132
+1.2°
vs. average
Normal: 71.0°F (1991–2020)

Average Temperature by Year — Jun 27 – Sep 25

1895–2026 · 2026 highlighted · trend +0.08° per decade (warming since 1895)

Precipitation by Year — Jun 27 – Sep 25

1895–2025 · 2026 highlighted · trend +0.26" per decade (wetter since 1895)

Warmest Jun 27 – Sep 25 on Record

# Year Avg Temp
1 2016 74.7°F
2 1931 73.7°F
3 1955 73.6°F
4 1900 73.4°F
5 2018 73.3°F
6 2020 73.3°F
7 1911 73.2°F
8 1901 73.2°F
9 2005 73.1°F
10 2022 73.1°F

Coolest Jun 27 – Sep 25 on Record

# Year Avg Temp
1 1927 66.7°F
2 1982 67.5°F
3 1963 67.6°F
4 1962 67.6°F
5 1956 67.6°F
6 1902 67.7°F
7 1940 67.7°F
8 1950 67.8°F
9 1965 67.8°F
10 2000 68.0°F
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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