Chattanooga, TN

Tennessee · Records since 1879–2026

🌤️ 94°F Feels like 101°
Currently in Chattanooga
As of 2:00 PM EDT
🔥 2° from today's record of 96°F

Records for September 11

🔥 Record High

96°F

September 11, 2010

+10° from 86° normal

❄ Record Low

46°F

September 11, 1940

-19° from 65° normal
🌞 Normal high: 86°F 🌑 Normal low: 65°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 11

# Temp Date
🏆 96°F September 11, 2010
2 96°F September 11, 1925
3 95°F September 11, 1896
4 94°F September 11, 2020
5 94°F September 11, 2019
6 94°F September 11, 2002
7 94°F September 11, 1927
8 93°F September 11, 1999
9 93°F September 11, 1939
10 93°F September 11, 1897

Top 5 Record Lows — September 11

# Temp Date
🥶 46°F September 11, 1940
2 47°F September 11, 1976
3 48°F September 11, 1949
4 48°F September 11, 1902
5 49°F September 11, 1969
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.
2
days
Hot Streak
2 consecutive days at or above 95°F · since September 9
1 more day to heat wave status

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
81
Dangerous nights 2026
Overnights ≥ 70°F
3
Heat waves 2026
so far

Days ≥ 90°F Per Year

1879–2026
73
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

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

Precipitation, Year to Date

30.95"
2026 YTD
Normal: 38.41"
-7.46"
0.00"
September so far
September normal: 4.23"
-4.23"
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 7.46" behind the normal pace

Period Review — Jun 12 – Sep 10, 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)
81.8°F
Average temperature
6th-warmest of 148
+2.4°
vs. average
Normal: 79.4°F (1991–2020)
10.88"
Precipitation
60th-driest of 148
-1.66"
vs. average
Normal: 12.54" · 87% of normal

Average Temperature by Year — Jun 12 – Sep 10

1879–2026 · 2026 highlighted · trend +0.18° per decade (warming since 1879)

Precipitation by Year — Jun 12 – Sep 10

1879–2026 · 2026 highlighted · trend +0.06" per decade (wetter since 1879)

Warmest Jun 12 – Sep 10 on Record

# Year Avg Temp
1 2016 83.1°F
2 2010 83.0°F
3 1993 82.4°F
4 1977 82.0°F
5 2024 81.9°F
6 2026 81.8°F
7 1936 81.5°F
8 2007 81.3°F
9 1954 81.3°F
10 2011 81.0°F

Coolest Jun 12 – Sep 10 on Record

# Year Avg Temp
1 1967 73.4°F
2 1974 73.4°F
3 1972 73.7°F
4 1992 74.9°F
5 1920 75.2°F
6 1976 75.4°F
7 1886 75.5°F
8 1917 75.6°F
9 1965 75.7°F
10 1889 75.8°F

Wettest Jun 12 – Sep 10 on Record

# Year Total
1 1950 26.35"
2 1994 23.58"
3 1920 22.98"
4 1989 21.83"
5 1949 21.35"
6 1941 19.63"
7 2021 19.21"
8 1912 18.95"
9 1916 18.53"
10 1928 18.34"

Driest Jun 12 – Sep 10 on Record

# Year Total
1 1902 3.85"
2 2024 4.20"
3 1957 5.22"
4 2016 5.38"
5 1993 5.39"
6 1930 5.71"
7 1980 5.73"
8 1897 5.98"
9 1925 6.13"
10 1968 6.18"
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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