Jacksonville, FL

Florida · Records since 1871–2026

🌤️ 91°F Feels like 100°
Currently in Jacksonville
As of 2:30 PM EDT
🔥 5° below today's record of 96°F

Records for September 11

🔥 Record High

96°F

September 11, 1939

+8° from 88° normal

❄ Record Low

62°F

September 11, 1998

-10° from 72° normal
🌞 Normal high: 88°F 🌑 Normal low: 72°F 1991–2020 normals

All-Time Records — Jacksonville

🔥
104°F
Hottest Day Ever
Jul 11, 1879
❄
7°F
Coldest Day Ever
Jan 21, 1985
🌧
9.82"
Wettest Day Ever
Sep 26, 1894
☃
1.9"
Most Snow in One Day
Feb 13, 1899

First & Last Dates — Jacksonville

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)
357 days
Longest growing season
1904
222 days
Shortest growing season
2007
279 days
Normal growing season
1991–2020 average

Top 10 Record Highs — September 11

# Temp Date
🏆 96°F September 11, 1939
2 95°F September 11, 2010
3 95°F September 11, 1876
4 94°F September 11, 1985
5 94°F September 11, 1983
6 94°F September 11, 1925
7 94°F September 11, 1881
8 94°F September 11, 1875
9 93°F September 11, 2023
10 93°F September 11, 2016

Top 5 Record Lows — September 11

# Temp Date
🥶 62°F September 11, 1998
2 62°F September 11, 1914
3 64°F September 11, 2003
4 65°F September 11, 2025
5 65°F September 11, 2012
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 1871–2026. Climate normals represent the 1991–2020 average.

Heat Wave Summary — Jacksonville

threshold: 95°F (90th percentile of historical Jun–Aug highs)
4.7
Avg heat wave length
days (historical)
98°
Avg peak temp
during heat waves
106
Dangerous nights 2026
Overnights ≥ 70°F
5
Heat waves 2026
so far

Days ≥ 90°F Per Year

1871–2026
102
2026 so far
69
Avg/year 1970–2025
94
Avg/year (last 10 complete)
114
Most in a year (2011)

Average Daily High by Decade

Full year · complete decades only

Longest Heat Waves — Jacksonville

# Dates Days Peak Avg High Avg Overnight Low
🏆 Jul 10, 1875 – Aug 1, 1875 23 101°F (Jul 20) 98°F 75°F
2 Jun 13, 1981 – Jun 26, 1981 14 102°F (Jun 15) 98°F 72°F
3 Jul 6, 1981 – Jul 18, 1981 13 103°F (Jul 17) 100°F 74°F
4 Jul 8, 1986 – Jul 20, 1986 13 102°F (Jul 20) 97°F 74°F
5 Jun 23, 1897 – Jul 4, 1897 12 99°F (Jun 28) 97°F 76°F
6 Aug 5, 2023 – Aug 16, 2023 12 99°F (Aug 8) 98°F 76°F
7 Jun 27, 1902 – Jul 7, 1902 11 101°F (Jul 7) 97°F 76°F
8 Jul 4, 2016 – Jul 14, 2016 11 100°F (Jul 9) 98°F 74°F
9 May 25, 2019 – Jun 4, 2019 11 100°F (May 27) 98°F 72°F
10 Jun 9, 1964 – Jun 19, 1964 11 99°F (Jun 11) 97°F 74°F

Heat Waves Per Year

Warm Summer Nights (Jun–Aug)

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

51
2026 total
above-normal nights
28.1
Avg / summer
1970–2020
89
Most in a summer
1873

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 +0.20" per decade, about +3.0" 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 Jacksonville is tracking against normal, year to date

Daily High Temperature vs Normal

Above normal Below normal

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

Precipitation, Year to Date

34.96"
2026 YTD
Normal: 39.52"
-4.56"
1.46"
September so far
September normal: 7.56"
-6.10"
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 · Jacksonville is 4.56" behind 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)
83.3°F
Average temperature
3rd-warmest of 155
+2.1°
vs. average
Normal: 81.1°F (1991–2020)
8.38"
Precipitation
47th-wettest of 155
+1.04"
vs. average
Normal: 7.34" · 114% of normal

Average Temperature by Year — Aug 11 – Sep 10

1872–2026 · 2026 highlighted

Precipitation by Year — Aug 11 – Sep 10

1872–2026 · 2026 highlighted · trend +0.11" per decade (wetter since 1872)

Warmest Aug 11 – Sep 10 on Record

# Year Avg Temp
1 1900 83.8°F
2 1954 83.3°F
3 1878 83.3°F
4 2026 83.3°F
5 1951 83.2°F
6 2019 83.1°F
7 2010 83.0°F
8 1938 82.9°F
9 1941 82.7°F
10 2023 82.7°F

Coolest Aug 11 – Sep 10 on Record

# Year Avg Temp
1 1984 78.3°F
2 1972 78.5°F
3 1922 78.6°F
4 1889 78.8°F
5 1996 79.1°F
6 1908 79.2°F
7 1927 79.2°F
8 1976 79.2°F
9 1930 79.3°F
10 1918 79.4°F

Wettest Aug 11 – Sep 10 on Record

# Year Total
1 1988 20.41"
2 2004 18.62"
3 1968 17.70"
4 1953 16.46"
5 1908 16.07"
6 2008 16.03"
7 1950 14.96"
8 2000 14.42"
9 2022 13.56"
10 1985 13.41"

Driest Aug 11 – Sep 10 on Record

# Year Total
1 1924 0.47"
2 1930 1.16"
3 1951 1.33"
4 2003 1.35"
5 1915 1.62"
6 1881 1.88"
7 1990 2.29"
8 1932 2.46"
9 1927 2.64"
10 1904 2.72"
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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