Key West, FL

Florida · Records since 1872–2026

⛅ 90°F Feels like 99°
Currently in Key West
As of 2:30 PM EDT
🔥 3° below today's record of 93°F

Records for September 11

🔥 Record High

93°F

September 11, 2020

+4° from 89° normal

❄ Record Low

71°F

September 11, 1900

-8° from 79° normal
🌞 Normal high: 89°F 🌑 Normal low: 79°F 1991–2020 normals

All-Time Records — Key West

🔥
97°F
Hottest Day Ever
Aug 26, 1956
❄
41°F
Coldest Day Ever
Jan 13, 1981
🌧
22.75"
Wettest Day Ever
Nov 11, 1980
☃
0.0"
Most Snow in One Day
Sep 9, 2026

First & Last Dates — Key West

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)

Top 10 Record Highs — September 11

# Temp Date
🏆 93°F September 11, 2020
2 93°F September 11, 1957
3 92°F September 11, 2025
4 92°F September 11, 2024
5 92°F September 11, 2023
6 92°F September 11, 1993
7 92°F September 11, 1963
8 92°F September 11, 1885
9 92°F September 11, 1877
10 91°F September 11, 2019

Top 5 Record Lows — September 11

# Temp Date
🥶 71°F September 11, 1900
2 72°F September 11, 1907
3 72°F September 11, 1890
4 73°F September 11, 1952
5 73°F September 11, 1921
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 — Key West

threshold: 92°F (90th percentile of historical Jun–Aug highs)
5.3
Avg heat wave length
days (historical)
93°
Avg peak temp
during heat waves
199
Dangerous nights 2026
Overnights ≥ 70°F
1
Heat waves 2026
so far

Days ≥ 90°F Per Year

1872–2026
75
2026 so far
45
Avg/year 1970–2025
65
Avg/year (last 10 complete)
116
Most in a year (1957)

Average Daily High by Decade

Full year · complete decades only

Longest Heat Waves — Key West

# Dates Days Peak Avg High Avg Overnight Low
🏆 Aug 3, 1956 – Sep 2, 1956 31 97°F (Aug 26) 94°F 79°F
2 Jun 26, 1957 – Jul 14, 1957 19 95°F (Jul 2) 94°F 80°F
3 Aug 9, 1957 – Aug 27, 1957 19 95°F (Aug 12) 93°F 78°F
4 Jul 26, 1990 – Aug 8, 1990 14 94°F (Jul 26) 93°F 79°F
5 Jul 30, 2007 – Aug 12, 2007 14 94°F (Aug 6) 93°F 83°F
6 Jun 24, 1881 – Jul 6, 1881 13 96°F (Jul 2) 93°F 81°F
7 Jul 24, 1883 – Aug 5, 1883 13 95°F (Aug 2) 93°F 80°F
8 Jul 22, 1884 – Aug 3, 1884 13 95°F (Aug 1) 93°F 80°F
9 Aug 9, 1954 – Aug 21, 1954 13 95°F (Aug 10) 93°F 79°F
10 Aug 9, 1991 – Aug 21, 1991 13 93°F (Aug 9) 92°F 80°F

Heat Waves Per Year

Warm Summer Nights (Jun–Aug)

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

67
2026 total
above-normal nights
36.0
Avg / summer
1970–2020
67
Most in a summer
2023

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 (1871–2026)

Blue = above average · tan = below average · gold = 2026 (partial)
Since 1871, annual totals have trended +0.15" per decade, about +2.4" 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 Key West is tracking against normal, year to date

Daily High Temperature vs Normal

Above normal Below normal

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

Precipitation, Year to Date

21.16"
2026 YTD
Normal: 25.74"
-4.58"
2.48"
September so far
September normal: 7.24"
-4.76"
2
2026 heavy rain days
Days with ≥ 1.0"

Accumulation vs. Normal

Running total since Jan 1 against the normal pace for the same date · Key West is 4.58" behind the normal pace

Period Review — Sep 1 – Sep 10, 2026

Any window, evaluated against every other year on record — 10 days

Quick picks: Last 7 days Last 30 days Last 90 days This month
Seasons: Spring (Mar–May) Summer (Jun–Aug) Fall (Sep–Nov)
85.7°F
Average temperature
12th-warmest of 154
+1.5°
vs. average
Normal: 84.2°F (1991–2020)
2.48"
Precipitation
43rd-wettest of 156
+0.08"
vs. average
Normal: 2.40" · 103% of normal

Average Temperature by Year — Sep 1 – Sep 10

1872–2026 · 2026 highlighted · trend +0.13° per decade (warming since 1872)

Precipitation by Year — Sep 1 – Sep 10

1871–2026 · 2026 highlighted · trend -0.01" per decade (drier since 1871)

Warmest Sep 1 – Sep 10 on Record

# Year Avg Temp
1 2015 87.0°F
2 1877 86.6°F
3 2024 86.6°F
4 1944 86.3°F
5 2023 86.1°F
6 1885 86.0°F
7 2020 85.8°F
8 1951 85.8°F
9 1967 85.8°F
10 2007 85.8°F

Coolest Sep 1 – Sep 10 on Record

# Year Avg Temp
1 1900 79.8°F
2 1897 80.2°F
3 1913 80.4°F
4 1960 80.4°F
5 1890 80.7°F
6 1887 81.1°F
7 1901 81.1°F
8 1894 81.2°F
9 1940 81.3°F
10 1898 81.3°F

Wettest Sep 1 – Sep 10 on Record

# Year Total
1 1919 13.76"
2 1894 7.45"
3 2017 6.95"
4 1897 6.49"
5 2010 6.45"
6 1878 6.43"
7 2025 6.39"
8 1965 5.97"
9 1940 5.88"
10 2002 5.55"

Driest Sep 1 – Sep 10 on Record

# Year Total
1 1967 0.00"
2 2024 0.14"
3 2015 0.14"
4 1944 0.16"
5 1912 0.18"
6 1985 0.21"
7 1876 0.22"
8 1994 0.27"
9 1920 0.27"
10 1988 0.28"
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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