Louisville, KY

Kentucky · Records since 1872–2026

🌤️ 79°F Feels like 88°
Currently in Louisville
As of 2:15 PM

Records for September 11

🔥 Record High

97°F

September 11, 2019

+13° from 84° normal

❄ Record Low

44°F

September 11, 1917

-20° from 64° normal
🌞 Normal high: 84°F 🌑 Normal low: 64°F 1991–2020 normals

All-Time Records — Louisville

🔥
107°F
Hottest Day Ever
Jul 14, 1936
❄
-22°F
Coldest Day Ever
Jan 19, 1994
🌧
10.48"
Wettest Day Ever
Mar 1, 1997
☃
15.5"
Most Snow in One Day
Jan 17, 1994

First & Last Dates — Louisville

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)
257 days
Longest growing season
1884
166 days
Shortest growing season
1976
213 days
Normal growing season
1991–2020 average

Top 10 Record Highs — September 11

# Temp Date
🏆 97°F September 11, 2019
2 97°F September 11, 1897
3 97°F September 11, 1896
4 95°F September 11, 1953
5 95°F September 11, 1952
6 95°F September 11, 1925
7 95°F September 11, 1895
8 94°F September 11, 1983
9 94°F September 11, 1912
10 94°F September 11, 1908

Top 5 Record Lows — September 11

# Temp Date
🥶 44°F September 11, 1917
2 45°F September 11, 1969
3 47°F September 11, 1883
4 48°F September 11, 1976
5 49°F September 11, 1993
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 1872–2026. Climate normals represent the 1991–2020 average.

Heat Wave Summary — Louisville

threshold: 94°F (90th percentile of historical Jun–Aug highs)
4.5
Avg heat wave length
days (historical)
98°
Avg peak temp
during heat waves
62
Dangerous nights 2026
Overnights ≥ 70°F
2
Heat waves 2026
so far

Days ≥ 90°F Per Year

1872–2026
36
2026 so far
38
Avg/year 1970–2025
49
Avg/year (last 10 complete)
85
Most in a year (2010)

Average Daily High by Decade

Full year · complete decades only

Longest Heat Waves — Louisville

# Dates Days Peak Avg High Avg Overnight Low
🏆 Aug 1, 2007 – Aug 16, 2007 16 105°F (Aug 16) 99°F 75°F
2 Jul 19, 1999 – Jul 31, 1999 13 104°F (Jul 30) 97°F 74°F
3 Aug 11, 1936 – Aug 22, 1936 12 101°F (Aug 19) 98°F 78°F
4 Jul 19, 1901 – Jul 29, 1901 11 107°F (Jul 24) 100°F 77°F
5 Jul 5, 1936 – Jul 15, 1936 11 107°F (Jul 14) 101°F 78°F
6 Jun 28, 2012 – Jul 8, 2012 11 106°F (Jul 7) 102°F 75°F
7 Aug 24, 1953 – Sep 3, 1953 11 103°F (Sep 1) 99°F 65°F
8 Jul 27, 1887 – Aug 5, 1887 10 102°F (Jul 29) 98°F 74°F
9 Jun 23, 1952 – Jul 2, 1952 10 102°F (Jun 29) 98°F 75°F
10 Jul 12, 1887 – Jul 21, 1887 10 101°F (Jul 18) 96°F 73°F

Heat Waves Per Year

Warm Summer Nights (Jun–Aug)

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

45
2026 total
above-normal nights
34.0
Avg / summer
1970–2020
75
Most in a summer
2010

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 (1872–2026)

Blue = above average · tan = below average · gold = 2026 (partial)
Since 1872, annual totals have trended +0.51" per decade, about +7.9" 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 Louisville is tracking against normal, year to date

Daily High Temperature vs Normal

Above normal Below normal

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

Precipitation, Year to Date

37.09"
2026 YTD
Normal: 34.48"
+2.61"
0.53"
September so far
September normal: 3.66"
-3.13"
10
2026 heavy rain days
Days with ≥ 1.0"

Accumulation vs. Normal

Running total since Jan 1 against the normal pace for the same date · Louisville is 2.61" 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)
80.3°F
Average temperature
7th-warmest of 155
+3.6°
vs. average
Normal: 76.7°F (1991–2020)
2.13"
Precipitation
51st-driest of 154
-1.31"
vs. average
Normal: 3.44" · 62% of normal

Average Temperature by Year — Aug 11 – Sep 10

1872–2026 · 2026 highlighted · trend +0.08° per decade (warming since 1872)

Precipitation by Year — Aug 11 – Sep 10

1872–2026 · 2026 highlighted · trend -0.02" per decade (drier since 1872)

Warmest Aug 11 – Sep 10 on Record

# Year Avg Temp
1 2007 83.1°F
2 1900 82.4°F
3 1936 82.3°F
4 1881 81.9°F
5 1959 80.9°F
6 1983 80.7°F
7 2026 80.3°F
8 1925 80.2°F
9 2016 80.2°F
10 1899 80.1°F

Coolest Aug 11 – Sep 10 on Record

# Year Avg Temp
1 1946 69.2°F
2 1967 69.3°F
3 1891 70.4°F
4 1982 70.7°F
5 1915 70.8°F
6 1879 70.8°F
7 1956 71.4°F
8 1963 71.7°F
9 2004 71.7°F
10 1935 71.8°F

Wettest Aug 11 – Sep 10 on Record

# Year Total
1 1879 13.77"
2 1888 11.38"
3 2018 10.39"
4 1926 7.84"
5 2020 7.60"
6 2017 7.40"
7 2005 7.30"
8 1944 6.98"
9 1921 6.87"
10 1974 6.47"

Driest Aug 11 – Sep 10 on Record

# Year Total
1 1953 0.02"
2 1881 0.02"
3 1999 0.08"
4 1998 0.17"
5 1955 0.24"
6 1903 0.28"
7 2024 0.31"
8 1995 0.49"
9 1925 0.61"
10 1883 0.65"
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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