Wilmington, OH

Ohio · Records since 1917–2026

☀️ 78°F Feels like 82°
Currently in Wilmington
As of 1:30 PM EDT

Records for September 7

🔥 Record High

101°F

September 7, 1939

+21° from 80° normal

❄ Record Low

39°F

September 7, 1988

-18° from 57° normal
🌞 Normal high: 80°F 🌑 Normal low: 57°F 1991–2020 normals

All-Time Records — Wilmington

🔥
111°F
Hottest Day Ever
Jul 21, 1934
❄
-25°F
Coldest Day Ever
Jan 22, 1984
🌧
5.35"
Wettest Day Ever
Jul 21, 1954
☃
14.0"
Most Snow in One Day
Nov 26, 1950

Top 10 Record Highs — September 7

# Temp Date
🏆 101°F September 7, 1939
2 96°F September 7, 1964
3 96°F September 7, 1922
4 95°F September 7, 1945
5 94°F September 7, 1946
6 94°F September 7, 1925
7 93°F September 7, 2010
8 92°F September 7, 1933
9 91°F September 7, 2002
10 91°F September 7, 1959

Top 5 Record Lows — September 7

# Temp Date
🥶 39°F September 7, 1988
2 39°F September 7, 1976
3 40°F September 7, 1984
4 41°F September 7, 1962
5 42°F September 7, 1956
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 1917–2026. Climate normals represent the 1991–2020 average.

Heat Wave Summary — Wilmington

threshold: 92°F (90th percentile of historical Jun–Aug highs)
4.6
Avg heat wave length
days (historical)
97°
Avg peak temp
during heat waves
18
Dangerous nights 2026
Overnights ≥ 70°F
1
Heat waves 2026
so far

2026 Daily High Temperature vs Normal

Year to date
Above normal Below normal

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

Days ≥ 90°F Per Year

1917–2026
12
2026 so far
24
Avg/year 1970–2025
15
Avg/year (last 10 complete)
72
Most in a year (1936)

Average Daily High by Decade

Full year · complete decades only

Longest Heat Waves — Wilmington

# Dates Days Peak Avg High Avg Overnight Low
🏆 Jun 18, 1933 – Jul 2, 1933 15 102°F (Jun 22) 97°F 63°F
2 Jul 19, 1940 – Jul 31, 1940 13 102°F (Jul 30) 96°F 69°F
3 Jul 6, 1936 – Jul 17, 1936 12 109°F (Jul 14) 102°F 68°F
4 Jun 28, 1949 – Jul 9, 1949 12 100°F (Jul 5) 96°F 68°F
5 Aug 4, 1918 – Aug 14, 1918 11 103°F (Aug 5) 98°F 72°F
6 Jun 20, 1934 – Jun 30, 1934 11 103°F (Jun 29) 97°F 65°F
7 Jun 28, 2012 – Jul 8, 2012 11 101°F (Jul 7) 96°F 68°F
8 Jul 1, 1921 – Jul 11, 1921 11 100°F (Jul 6) 95°F 67°F
9 Aug 25, 1953 – Sep 4, 1953 11 100°F (Aug 30) 97°F 62°F
10 Jul 18, 1934 – Jul 27, 1934 10 111°F (Jul 21) 104°F 70°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
42.9
Avg / summer
1970–2020
70
Most in a summer
2025

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

34.99"
2026 YTD
Normal: 30.58"
+4.41"
0.74"
September so far
September normal: 2.93"
-2.19"
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 · Wilmington is 4.41" ahead of the normal pace

Monthly Precipitation — Last 24 Months

Blue = actual · dashed line = monthly normal

Annual Precipitation Per Year (1915–2026)

Blue = above average · tan = below average · gold = 2026 (partial)
Since 1915, annual totals have trended -0.39" per decade, about -4.3" 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

73.2°F

Average temperature · August 2026

127th-warmest month on record

38th-warmest August of 109 on record

+1.1° vs. 72.1° average (1991–2020)
80.7°F
Warmest month ever
July 1934
78.4°F
Warmest August ever
1947
96°F
Hottest of 2026
Sep 4

Average August Temperature by Year

1917–2026 · 2026 highlighted · trend -0.11° per decade (cooling since 1917)

Precipitation — August 2026

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

6.20"
Total precipitation
August 2026
+2.99"
vs. average
Normal: 3.21" · 193% of normal
9th-wettest
August rank
of 110 on record
10.59"
Wettest August ever
1926 · driest 0.39" (2025)

August Precipitation by Year

1915–2026 · 2026 highlighted · trend -0.11" per decade (drier since 1915)

Wettest Augusts on Record

# Year Total
1 1926 10.59"
2 1921 8.28"
3 1979 7.95"
4 1958 7.32"
5 1925 7.28"
6 1915 7.13"
7 1968 6.99"
8 1954 6.23"
9 2026 6.20"
10 1934 5.87"

Driest Augusts on Record

# Year Total
1 2025 0.39"
2 1993 0.71"
3 1967 0.91"
4 1962 0.93"
5 2012 1.01"
6 1955 1.07"
7 1951 1.12"
8 1957 1.16"
9 2013 1.32"
10 1948 1.33"

Warmest Augusts on Record

# Year Avg Temp
1 1947 78.4°F
2 1936 78.1°F
3 1918 78.0°F
4 2007 76.8°F
5 1983 76.4°F
6 1995 76.1°F
7 1937 76.0°F
8 1955 76.0°F
9 1938 75.9°F
10 2016 75.9°F

Warmest Months on Record (Any Month)

# Month Avg Temp
1 July 1934 80.7°F
2 July 1936 80.2°F
3 July 1949 79.5°F
4 July 1921 79.0°F
5 July 1931 78.5°F
6 August 1947 78.4°F
7 July 2011 78.3°F
8 August 1936 78.1°F
9 August 1918 78.0°F
10 July 1930 77.8°F

Nearby Stations — August 2026

How the same month ranked at the closest reporting stations

Station Avg Temp August Rank
Wilmington, OH 73.2°F 38th of 109
Dayton, OH 73.3°F 69th of 133
Cincinnati, OH 75.4°F 59th of 155
Columbus, OH 74.7°F 42nd of 149
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 1,296 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 110 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 4
so far
 Aug 27 Jun 11, 2000 Oct 13, 1928 -3.1 d/decade
Last 80°F day
The last genuinely warm afternoon
 Sep 6
so far
 Oct 6 Sep 12, 1966 Nov 7, 1938 -1.4 d/decade
First high below 50°F
The first afternoon that stays cold
 not yet Oct 27 Sep 30, 1924 Nov 26, 1931
First 32°F freeze
Growing season over
 not yet Oct 18 Sep 11, 1917 Nov 8, 1956 +1.2 d/decade
First 28°F hard freeze
Cold enough to end tender growth
 not yet Nov 1 Sep 24, 1928 Nov 29, 2024 +1.3 d/decade
First 20°F night
Winter cold arriving
 not yet Nov 28 Oct 18, 1976 Dec 24, 2020 +1.7 d/decade
First measurable snow
0.1" or more in a day
 not yet — Oct 19, 1989 Dec 30, 1986 +0.2 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 1917 · trending +1.2 days later per decade

180
Normal length
1991–2020 average
204
Longest on record
1996
126
Shortest on record
1923

Growing Season Length by Year

Days between the last spring freeze and the first fall freeze · trending +2.5 days longer per decade

Fall Average Temperature by Year

1917–2025 · 2026 highlighted

Fall Precipitation by Year

1915–2025 · 2026 highlighted · trend -0.04" per decade (drier since 1915)

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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