Wilmington, OH

Ohio · Records since 1917–2026

⛅ 78°F Feels like 83°
Currently in Wilmington
As of 2:30 PM EDT

Records for September 11

🔥 Record High

95°F

September 11, 1983

+16° from 79° normal

❄ Record Low

31°F

September 11, 1917

-25° from 56° normal
🌞 Normal high: 79°F 🌑 Normal low: 56°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

First & Last Dates — Wilmington

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)
204 days
Longest growing season
1996
126 days
Shortest growing season
1923
180 days
Normal growing season
1991–2020 average

Top 10 Record Highs — September 11

# Temp Date
🏆 95°F September 11, 1983
2 94°F September 11, 1936
3 94°F September 11, 1931
4 93°F September 11, 1947
5 91°F September 11, 2013
6 91°F September 11, 1952
7 91°F September 11, 1930
8 90°F September 11, 1953
9 90°F September 11, 1928
10 90°F September 11, 1921

Top 5 Record Lows — September 11

# Temp Date
🥶 31°F September 11, 1917
2 39°F September 11, 1976
3 41°F September 11, 1969
4 41°F September 11, 1939
5 41°F September 11, 1935
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
19
Dangerous nights 2026
Overnights ≥ 70°F
1
Heat waves 2026
so far

Days ≥ 90°F Per Year

1917–2026
13
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

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 (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")

This Year — 2026

How Wilmington is tracking against normal, year to date

Daily High Temperature vs Normal

Above normal Below normal

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

Precipitation, Year to Date

36.77"
2026 YTD
Normal: 30.99"
+5.78"
2.52"
September so far
September normal: 2.93"
-0.41"
11
2026 heavy rain days
Days with ≥ 1.0"

Accumulation vs. Normal

Running total since Jan 1 against the normal pace for the same date · Wilmington is 5.78" ahead of the normal pace

Period Review — Sep 3 – Sep 10, 2026

Any window, evaluated against every other year on record — 8 days

Quick picks: Last 7 days Last 30 days Last 90 days This month
Seasons: Spring (Mar–May) Summer (Jun–Aug) Fall (Sep–Nov)
76.2°F
Average temperature
7th-warmest of 108
+7.1°
vs. average
Normal: 69.1°F (1991–2020)
2.52"
Precipitation
10th-wettest of 109
+1.85"
vs. average
Normal: 0.67" · 376% of normal

Average Temperature by Year — Sep 3 – Sep 10

1917–2026 · 2026 highlighted · trend -0.18° per decade (cooling since 1917)

Precipitation by Year — Sep 3 – Sep 10

1915–2026 · 2026 highlighted · trend -0.07" per decade (drier since 1915)

Warmest Sep 3 – Sep 10 on Record

# Year Avg Temp
1 1985 78.4°F
2 1925 78.4°F
3 1922 78.1°F
4 1939 77.9°F
5 1933 77.6°F
6 1961 77.1°F
7 2026 76.2°F
8 1941 76.1°F
9 1947 75.7°F
10 2007 75.6°F

Coolest Sep 3 – Sep 10 on Record

# Year Avg Temp
1 1976 58.3°F
2 1924 59.5°F
3 1988 60.6°F
4 2025 60.9°F
5 2017 61.2°F
6 1986 62.3°F
7 1994 62.7°F
8 1982 63.2°F
9 1956 63.4°F
10 1928 63.4°F

Wettest Sep 3 – Sep 10 on Record

# Year Total
1 1935 4.37"
2 1937 4.00"
3 1926 3.26"
4 1915 3.09"
5 1971 2.91"
6 2018 2.81"
7 2012 2.71"
8 1929 2.67"
9 1938 2.66"
10 2026 2.52"

Driest Sep 3 – Sep 10 on Record

# Year Total
1 2019 0.00"
2 2013 0.00"
3 2002 0.00"
4 1987 0.00"
5 1985 0.00"
6 1983 0.00"
7 1982 0.00"
8 1979 0.00"
9 1978 0.00"
10 1964 0.00"
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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