Weather in Marathon, FL
Marathon, Sunday, 11 October, 07:43
Overcast. Feels like 96°. High 89°, low 81°.
Monthly outlook for Marathon, FL: average high 82.8°, average low 79.1°. That is 1.3° above the climate normal for October. Precipitation is expected on 15 days (about 3.7 inches), against a normal of 7 days and 2.4 inches. The warmest day looks like 11 October (89.3°), the coolest 18 October (73°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 11 October – 20 October | 83.4° | 80.8° | +1.4° |
| 21 October – 30 October | 81.8° | 79.6° | +1.3° |
| 31 October – 9 November | at normal | 78.3° | — |
October records over 66 years
Climate normals and records are computed from the nearest reference point — Key Colony Beach (1 mi).
0.03
Marathon, Monday, 12 October
Light rain. High 85°, low 80°.
0.12Marathon, Tuesday, 13 October
Light rain. High 84°, low 81°.
0.13Marathon, Wednesday, 14 October
Light rain. High 84°, low 81°.
0.13Marathon, Thursday, 15 October
Light rain. High 84°, low 80°.
0.11Marathon, Friday, 16 October
Light rain. High 84°, low 81°.
0.63Marathon, Saturday, 17 October
Rain. High 84°, low 78°.
0.06Marathon, Sunday, 18 October
Light rain. High 78°, low 73°.
0.15Marathon, Monday, 19 October
Light rain. High 81°, low 77°.
0.48Marathon, Tuesday, 20 October
Light rain. High 82°, low 80°.
0.17Marathon, Wednesday, 21 October
Light rain. High 83°, low 81°.
0.12Marathon, Thursday, 22 October
Light rain. High 82°, low 79°.
0.17Marathon, Friday, 23 October
Light rain. High 82°, low 78°.
0.59Marathon, Saturday, 24 October
Rain. High 80°, low 78°.
0.47Marathon, Sunday, 25 October
Rain. High 82°, low 80°.
0.16Marathon, Monday, 26 October
Light rain. High 82°, low 79°.
0.09
Marathon, Tuesday, 27 October
Climate normal for this date — 60-year average.
0.08
Marathon, Wednesday, 28 October
Climate normal for this date — 60-year average.
0.08Marathon, Thursday, 29 October
Climate normal for this date — 60-year average.
0.04Marathon, Friday, 30 October
Climate normal for this date — 60-year average.
0.08Marathon, Saturday, 31 October
Climate normal for this date — 60-year average.
0.08Marathon, Sunday, 1 November
Climate normal for this date — 60-year average.
0.09Marathon, Monday, 2 November
Climate normal for this date — 60-year average.
0.08Marathon, Tuesday, 3 November
Climate normal for this date — 60-year average.
0.13Marathon, Wednesday, 4 November
Climate normal for this date — 60-year average.
0.1Marathon, Thursday, 5 November
Climate normal for this date — 60-year average.
0.06Marathon, Friday, 6 November
Climate normal for this date — 60-year average.
0.06Marathon, Saturday, 7 November
Climate normal for this date — 60-year average.
0.09Marathon, Sunday, 8 November
Climate normal for this date — 60-year average.
0.06Marathon, Monday, 9 November
Climate normal for this date — 60-year average.
About the monthly outlook
How accurate is a 30-day forecast?
The first 16 days come from weather models — reliable for the first 3–5 days and progressively less so after that. Days 17 through 30 for Marathon, FL are built from the climate normal, the 60-year average, so they show typical weather for those dates rather than a specific forecast.
What does "above normal" mean?
We compare the forecast against the climate normal for those exact calendar days, computed from 60 years of observations. The deviation shows how much the coming month differs from a typical one.
Where do the 66-year records come from?
They are real temperature extremes recorded in Marathon, FL since 1960: the highest and lowest reading for each calendar date, with the year it happened.
How often is it updated?
The forecast portion refreshes every hour; the climate portion is based on long-term data and stays stable.
Sun and moon today
Weather history
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