Chattanooga, TN

Tennessee · Records since 1879–2026

🌙 67°F
Currently in Chattanooga
As of 10:15 PM EDT

Records for September 26

🔥 Record High

96°F

September 26, 2019

+15° from 81° normal

❄ Record Low

42°F

September 26, 1940

-18° from 60° normal
🌞 Normal high: 81°F 🌑 Normal low: 60°F 1991–2020 normals

All-Time Records — Chattanooga

🔥
107°F
Hottest Day Ever
Jul 1, 2012
❄
-10°F
Coldest Day Ever
Jan 21, 1985
🌧
9.49"
Wettest Day Ever
Sep 5, 2011
☃
18.5"
Most Snow in One Day
Mar 13, 1993

First & Last Dates — Chattanooga

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)
275 days
Longest growing season
1905
179 days
Shortest growing season
1974
230 days
Normal growing season
1991–2020 average

Top 10 Record Highs — September 26

# Temp Date
🏆 96°F September 26, 2019
2 91°F September 26, 1897
3 90°F September 26, 2017
4 90°F September 26, 2007
5 90°F September 26, 1998
6 90°F September 26, 1900
7 89°F September 26, 2023
8 89°F September 26, 2016
9 89°F September 26, 1993
10 89°F September 26, 1986

Top 5 Record Lows — September 26

# Temp Date
🥶 42°F September 26, 1940
2 43°F September 26, 1943
3 44°F September 26, 2001
4 45°F September 26, 1965
5 46°F September 26, 1964
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 1879–2026. Climate normals represent the 1991–2020 average.

Heat Wave Summary — Chattanooga

threshold: 95°F (90th percentile of historical Jun–Aug highs)
4.7
Avg heat wave length
days (historical)
99°
Avg peak temp
during heat waves
91
Dangerous nights 2026
Overnights ≥ 70°F
5
Heat waves 2026
so far

Days ≥ 90°F Per Year

1879–2026
85
2026 so far
47
Avg/year 1970–2025
67
Avg/year (last 10 complete)
102
Most in a year (2016)

Average Daily High by Decade

Full year · complete decades only

Longest Heat Waves — Chattanooga

# Dates Days Peak Avg High Avg Overnight Low
🏆 Aug 4, 2007 – Aug 25, 2007 22 105°F (Aug 23) 99°F 74°F
2 Aug 15, 1993 – Sep 1, 1993 18 100°F (Aug 29) 98°F 72°F
3 Jul 20, 1987 – Aug 5, 1987 17 100°F (Jul 24) 98°F 71°F
4 Jul 4, 1980 – Jul 19, 1980 16 105°F (Jul 13) 99°F 74°F
5 Jul 18, 1952 – Jul 30, 1952 13 106°F (Jul 28) 102°F 70°F
6 Jul 17, 1993 – Jul 29, 1993 13 104°F (Jul 29) 100°F 74°F
7 Jun 18, 1931 – Jun 30, 1931 13 101°F (Jun 28) 97°F 72°F
8 May 31, 2011 – Jun 12, 2011 13 98°F (Jun 5) 96°F 70°F
9 Jun 28, 2012 – Jul 8, 2012 11 107°F (Jun 30) 101°F 72°F
10 Jul 30, 1935 – Aug 9, 1935 11 104°F (Aug 7) 99°F 76°F

Heat Waves Per Year

Warm Summer Nights (Jun–Aug)

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

60
2026 total
above-normal nights
35.7
Avg / summer
1970–2020
77
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 (1879–2026)

Blue = above average · tan = below average · gold = 2026 (partial)
Since 1879, annual totals have trended +0.26" per decade, about +3.8" 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 Chattanooga is tracking against normal, year to date

Daily High Temperature vs Normal

Above normal Below normal

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

Precipitation, Year to Date

31.63"
2026 YTD
Normal: 40.59"
-8.96"
0.68"
September so far
September normal: 4.23"
-3.55"
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 · Chattanooga is 8.96" behind the normal pace

Period Review — Aug 26 – Sep 25, 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)
83.1°F
Average temperature
2nd-warmest of 148
+7.4°
vs. average
Normal: 75.6°F (1991–2020)

Average Temperature by Year — Aug 26 – Sep 25

1879–2026 · 2026 highlighted · trend +0.17° per decade (warming since 1879)

Precipitation by Year — Aug 26 – Sep 25

1879–2025 · 2026 highlighted · trend +0.10" per decade (wetter since 1879)

Warmest Aug 26 – Sep 25 on Record

# Year Avg Temp
1 1925 83.3°F
2 2026 83.1°F
3 2016 80.9°F
4 2019 79.8°F
5 2018 79.7°F
6 1931 79.6°F
7 2010 79.1°F
8 1936 79.0°F
9 1921 78.7°F
10 2024 78.5°F

Coolest Aug 26 – Sep 25 on Record

# Year Avg Temp
1 1879 69.0°F
2 1969 69.7°F
3 1967 69.7°F
4 1966 69.7°F
5 1918 70.2°F
6 1902 70.4°F
7 1974 70.4°F
8 1984 70.5°F
9 1976 70.6°F
10 1952 70.6°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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