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Climate
Statistics · City
Average daily low in Marathon
1991–2020 · 1 data point
5 of 391 · Towns of Florida
Updated Oct 21, 2026
Source: NOAA National Centers for Environmental Information, U.S. Climate Normals 1991–2020, 1991–2020
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Latest value · 1991–2020
73 °F
Towns of Florida · 2020
5 of 391
Place 1 is the highest value.
Weather through the year long-term average 1991–2020 · Marathon Ap weather station, 2 km away
76°
64°
Jan
78°
66°
Feb
81°
69°
Mar
84°
73°
Apr
87°
76°
May
90°
78°
Jun
91°
79°
Jul
92°
80°
Aug
90°
78°
Sep
86°
76°
Oct
81°
71°
Nov
78°
67°
Dec
1.6
1.7
1.3
2.1
3.4
4.2
3.8
5.3
6.4
5.9
1.8
2.2
High and low, °F
Precipitation, inches
Source: NOAA National Centers for Environmental Information, U.S. Climate Normals 1991–2020, 1991–2020
Ranking · Towns of Florida
2020 · Place 1 is the highest value.
| # | Territory | Average daily low | |
|---|---|---|---|
| 1 | Cudjoe Key | 74 °F | |
| 2 | Key West | 74 °F | |
| 3 | Stock Island | 74 °F | |
| 4 | Islamorada | 73 °F | |
| 5 | Marathon | 73 °F | |
| 6 | Coral Gables | 73 °F | |
| 7 | Glenvar Heights | 73 °F | |
| 8 | Kendall | 73 °F | |
| 9 | Key Biscayne | 73 °F | |
| 10 | Olympia Heights | 73 °F | |
| 11 | Pinecrest | 73 °F | |
| 12 | South Miami | 73 °F | |
| 13 | Sunset | 73 °F | |
| 14 | Big Pine Key | 72 °F | |
| 15 | Duck Key | 72 °F | |
| 16 | Layton | 72 °F | |
| 17 | Tavernier | 72 °F | |
| 18 | Key Largo | 72 °F | |
| 19 | Bal Harbour | 71 °F | |
| 20 | Bay Harbor Islands | 71 °F | |
| 21 | Biscayne Park | 71 °F | |
| 22 | El Portal | 71 °F | |
| 23 | Miami | 71 °F | |
| 24 | Miami Beach | 71 °F | |
| 25 | Miami Shores | 71 °F | |
| … |
Source: NOAA National Centers for Environmental Information, U.S. Climate Normals 1991–2020, 2020
What it means
The typical coolest temperature of the day, usually at night, averaged over the year.
How it is calculated
Mean of the twelve monthly normals of the daily minimum at the nearest weather station: 1991–2020, or the latest ten years where the older record is missing.
Climate
Marathon in numbers
Average daily high
85 °F
1991–2020
Normal annual rainfall
39.7 in
1991–2020
Days at 90 °F (32 °C) or hotter
105
1991–2020
Days with 0.1 in (2.5 mm) of rain or more
59
1991–2020
Average annual temperature
78 °F
2025 · Monroe County
Annual precipitation
40.4 in
2025 · Monroe County
CO₂ emissions per person
13.6
2024 · United States