Marathon, FL

Florida · Records since 1950–2026

⛅ 90°F Feels like 103°
Currently in Marathon
As of 2:30 PM EDT
🔥 6° below today's record of 96°F

Records for September 11

🔥 Record High

96°F

September 11, 2023

+6° from 90° normal

❄ Record Low

69°F

September 11, 1956

-9° from 78° normal
🌞 Normal high: 90°F 🌑 Normal low: 78°F 1991–2020 normals

All-Time Records — Marathon

🔥
99°F
Hottest Day Ever
Jul 24, 2023
❄
37°F
Coldest Day Ever
Dec 25, 1989
🌧
8.33"
Wettest Day Ever
Aug 24, 1995
☃
0.0"
Most Snow in One Day
Sep 9, 2026

First & Last Dates — Marathon

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
🏆 96°F September 11, 2023
2 96°F September 11, 2022
3 93°F September 11, 2015
4 93°F September 11, 2011
5 93°F September 11, 1970
6 92°F September 11, 2021
7 92°F September 11, 2012
8 92°F September 11, 1993
9 92°F September 11, 1984
10 92°F September 11, 1969

Top 5 Record Lows — September 11

# Temp Date
🥶 69°F September 11, 1956
2 72°F September 11, 1953
3 73°F September 11, 1972
4 74°F September 11, 1966
5 74°F September 11, 1963
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 1950–2026. Climate normals represent the 1991–2020 average.

Heat Wave Summary — Marathon

threshold: 93°F (90th percentile of historical Jun–Aug highs)
5.8
Avg heat wave length
days (historical)
95°
Avg peak temp
during heat waves
202
Dangerous nights 2026
Overnights ≥ 70°F
0
Heat waves 2026
so far

Days ≥ 90°F Per Year

1950–2026
52
2026 so far
79
Avg/year 1970–2025
109
Avg/year (last 10 complete)
159
Most in a year (2019)

Average Daily High by Decade

Full year · complete decades only

Longest Heat Waves — Marathon

# Dates Days Peak Avg High Avg Overnight Low
🏆 Jun 29, 2023 – Jul 25, 2023 27 99°F (Jul 13) 96°F 84°F
2 Aug 30, 2022 – Sep 17, 2022 19 96°F (Sep 2) 94°F 81°F
3 Jul 29, 2015 – Aug 14, 2015 17 95°F (Aug 8) 94°F 81°F
4 Jul 12, 2009 – Jul 27, 2009 16 96°F (Jul 24) 94°F 82°F
5 Jun 23, 2020 – Jul 8, 2020 16 95°F (Jul 5) 94°F 82°F
6 Jun 29, 2022 – Jul 14, 2022 16 95°F (Jul 12) 94°F 82°F
7 Jun 1, 2019 – Jun 15, 2019 15 98°F (Jun 8) 96°F 84°F
8 Aug 15, 2022 – Aug 28, 2022 14 96°F (Aug 19) 95°F 82°F
9 Jun 27, 2015 – Jul 10, 2015 14 94°F (Jun 30) 93°F 82°F
10 Jul 27, 2002 – Aug 7, 2002 12 97°F (Aug 2) 95°F 82°F

Heat Waves Per Year

Warm Summer Nights (Jun–Aug)

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

72
2026 total
above-normal nights
41.9
Avg / summer
1970–2020
65
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 (1950–2026)

Blue = above average · tan = below average · gold = 2026 (partial)
Since 1950, annual totals have trended +0.85" per decade, about +6.3" 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 Marathon is tracking against normal, year to date

Daily High Temperature vs Normal

Above normal Below normal

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

Precipitation, Year to Date

16.42"
2026 YTD
Normal: 25.49"
-9.07"
0.55"
September so far
September normal: 6.37"
-5.82"
5
2026 heavy rain days
Days with ≥ 1.0"

Accumulation vs. Normal

Running total since Jan 1 against the normal pace for the same date · Marathon is 9.07" 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)
85.8°F
Average temperature
10th-warmest of 65
+0.7°
vs. average
Normal: 85.2°F (1991–2020)
4.16"
Precipitation
1st-driest of 55
-9.18"
vs. average
Normal: 13.34" · 31% of normal

Average Temperature by Year — Jun 12 – Sep 10

1950–2026 · 2026 highlighted · trend +0.40° per decade (warming since 1950)

Precipitation by Year — Jun 12 – Sep 10

1952–2026 · 2026 highlighted · trend -0.29" per decade (drier since 1952)

Warmest Jun 12 – Sep 10 on Record

# Year Avg Temp
1 2023 88.1°F
2 2022 86.9°F
3 2015 86.7°F
4 2019 86.5°F
5 2011 86.4°F
6 1998 86.3°F
7 2017 86.2°F
8 2009 86.1°F
9 2002 85.9°F
10 2026 85.8°F

Coolest Jun 12 – Sep 10 on Record

# Year Avg Temp
1 1953 81.2°F
2 1955 82.2°F
3 1988 82.2°F
4 1954 82.5°F
5 1974 82.5°F
6 1956 82.8°F
7 1959 82.9°F
8 1972 83.1°F
9 1952 83.3°F
10 1984 83.4°F

Wettest Jun 12 – Sep 10 on Record

# Year Total
1 1988 22.58"
2 1995 20.67"
3 2002 20.02"
4 1959 19.48"
5 2006 19.48"
6 2024 19.14"
7 2010 18.80"
8 1972 18.63"
9 1983 18.43"
10 1958 18.41"

Driest Jun 12 – Sep 10 on Record

# Year Total
1 2026 4.16"
2 2015 5.29"
3 2022 6.39"
4 1993 6.43"
5 1996 6.51"
6 1987 6.67"
7 2011 7.78"
8 1964 7.83"
9 1982 8.12"
10 1970 8.40"
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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