Coastal Flood Advisory
Ends in 18 h 34 min
When
Until 5 AM EDT Sunday, especially at the times of high tide.
Where
Middle and Lower Florida Keys.
Issued for this forecast zone · National Weather Service Key West FL
What, impacts and precautionsHide details
What
Saltwater flooding.
Impacts
Saltwater flooding of low elevation streets and lots is expected. Some storm drains will overflow, and some seawalls and docks will be overtopped. Boaters can expect less clearance under fixed bridges. Motorists should remember that persistent puddles around the times of high tide are almost certain to contain a mix of saltwater.
Precautionary actions
If travel is required, allow extra time as some roads may be closed. Do not drive around barricades or through water of unknown depth. Take the necessary actions to protect flood-prone property.
Areas: Monroe Middle Keys; Monroe Lower Keys
See it on weather.gov (opens in a new tab)

Observed 10:05 AM EDT at KMTH

Marathon, FL weather

Sunny and 75°24°.

Forecasts agree

Now 75°24°

Sunny

Wind: 9 mph15 km/h; From the north. Gusts to 24 mph39 km/h around 11 AM
Dew point: 68°20°; Muggy
UV index: 2Low; High 12–4 PM · peak 7

Light rain now, through the next 2 hours.

From forecast models

Next 48 hours

2°1° warmer than this time yesterday (74°23° then, 76°24° now)

Good hours for

Gusts to 25 mph40 km/h tonight 1–5 AM
Gusts to 26 mph42 km/h tomorrow 8–9 AM
Gusts to 33 mph53 km/h tomorrow night 6 PM–3 AM
Drizzle tomorrow night from 8 PM (60%, 0.14 in3.6 mm)
Gusts to 27 mph43 km/h Monday from 6 AM

This morningNear 80°27° · rain chance 20% · Mostly cloudy
This afternoonNear 80°27° · rain chance 20% · Mostly cloudy
TonightNear 79°26° · rain chance 20% · gusts to 25 mph40 km/h · Clear
Tomorrow morningDown to 72°22° by 7 AM · rain chance 30% · gusts to 26 mph42 km/h · Clear
Tomorrow afternoonNear 81°27° · rain chance 30% · Partly cloudy
Tomorrow nightNear 80°27° · Rain 8 PM–6 AM (40%) · gusts to 33 mph53 km/h
Monday morningDown to 74°23° by 7 AM · Rain all morning (60%) · gusts to 27 mph43 km/h

Hourly forecast, next 48 hours, in the place's local time
Hour	Conditions	Temperature	Feels like	Precipitation	Wind	Humidity	Cloud cover	UV index
Sat 10a	Cloudy	79°26° (likely 76°24° to 79°26°)	79°26°	20%	15 mph24 km/h from NE, gusts 24 mph39 km/h	72%	87%	2
Sat 11a	Cloudy	80°27° (likely 77°25° to 80°27°)	83°28°	20%	15 mph24 km/h from NE, gusts 24 mph39 km/h	69%	82%	4
Sat 12p	Cloudy	80°27° (likely 78°26° to 81°27°)	83°28°	20%	15 mph24 km/h from NE, gusts 24 mph38 km/h	69%	77%	6
Sat 1p	Cloudy	81°27° (likely 79°26° to 81°27°)	84°29°	20%	15 mph24 km/h from NE, gusts 23 mph37 km/h	67%	73%	7
Sat 2p	Showers	81°27° (likely 79°26° to 82°28°)	84°29°	20%	15 mph24 km/h from NE, gusts 22 mph35 km/h	67%	51%	7
Sat 3p	Cloudy	81°27° (likely 80°27° to 82°28°)	84°29°	20%	15 mph24 km/h from NE, gusts 20 mph31 km/h	65%	67%	6
Sat 4p	Showers	81°27° (likely 80°27° to 82°28°)	84°29°	20%	15 mph24 km/h from NE, gusts 19 mph30 km/h	67%	49%	4
Sat 5p	Showers	80°27° (likely 80°27° to 81°27°)	83°28°	20%	15 mph24 km/h from NE, gusts 19 mph30 km/h	69%	53%	2
Sat 6p	Showers	80°27° (likely 80°27° to 81°27°)	83°28°	20%	15 mph24 km/h from NE, gusts 19 mph31 km/h	69%	58%	0
Sat 7p	Showers	79°26° (likely 78°26° to 81°27°)	79°26°	20%	15 mph24 km/h from NE, gusts 22 mph35 km/h	69%	43%	0
Sat 8p	Clear	79°26° (likely 77°25° to 81°27°)	79°26°	5%	15 mph24 km/h from NE, gusts 21 mph34 km/h	69%	41%	0
Sat 9p	Clear	79°26° (likely 73°23° to 80°27°)	79°26°	5%	15 mph24 km/h from NE, gusts 23 mph37 km/h	69%	33%	0
Sat 10p	Clear	79°26° (likely 74°23° to 79°26°)	79°26°	5%	15 mph24 km/h from NE, gusts 24 mph38 km/h	69%	3%	0
Sat 11p	Clear	79°26° (likely 74°23° to 79°26°)	79°26°	5%	15 mph24 km/h from NE, gusts 25 mph40 km/h	69%	3%	0
Sun 12a	Clear	79°26° (likely 73°23° to 79°26°)	79°26°	5%	15 mph24 km/h from NE, gusts 25 mph40 km/h	69%	4%	0
Sun 1a	Clear	78°26° (likely 73°23° to 78°26°)	78°26°	5%	15 mph24 km/h from NE, gusts 25 mph40 km/h	74%	3%	0
Sun 2a	Clear	78°26° (likely 73°23° to 78°26°)	78°26°	5%	15 mph24 km/h from N, gusts 25 mph40 km/h	74%	5%	0
Sun 3a	Clear	78°26° (likely 72°22° to 78°26°)	78°26°	5%	15 mph24 km/h from N, gusts 25 mph41 km/h	74%	5%	0
Sun 4a	Clear	78°26° (likely 72°22° to 78°26°)	78°26°	5%	15 mph24 km/h from N, gusts 25 mph41 km/h	74%	4%	0
Sun 5a	Clear	78°26° (likely 72°22° to 78°26°)	78°26°	5%	15 mph24 km/h from N, gusts 24 mph38 km/h	76%	6%	0
Sun 6a	Clear	77°25° (likely 71°22° to 77°25°)	77°25°	5%	15 mph24 km/h from N, gusts 24 mph39 km/h	79%	10%	0
Sun 7a	Sunny	72°22° (likely 71°22° to 75°24°)	72°22°	5%	15 mph24 km/h from N, gusts 25 mph40 km/h	97%	11%	0
Sun 8a	Sunny	78°26° (likely 73°23° to 78°26°)	78°26°	30%	15 mph24 km/h from N, gusts 26 mph42 km/h	76%	14%	0
Sun 9a	Sunny	78°26° (likely 74°23° to 78°26°)	78°26°	30%	15 mph24 km/h from N, gusts 24 mph38 km/h	79%	16%	1
Sun 10a	Sunny	79°26° (likely 75°24° to 79°26°)	79°26°	30%	15 mph24 km/h from N, gusts 22 mph36 km/h	77%	17%	3
Sun 11a	Sunny	80°27° (likely 76°24° to 80°27°)	83°28°	30%	15 mph24 km/h from N, gusts 23 mph37 km/h	74%	24%	4
Sun 12p	Sunny	81°27° (likely 77°25° to 81°27°)	85°29°	30%	15 mph24 km/h from N, gusts 24 mph38 km/h	72%	12%	6
Sun 1p	Sunny	81°27° (likely 78°26° to 81°27°)	85°29°	30%	15 mph24 km/h from N, gusts 22 mph36 km/h	72%	11%	7
Sun 2p	Sunny	82°28° (likely 80°27° to 82°28°)	86°30°	30%	10 mph16 km/h from NE, gusts 17 mph28 km/h	69%	7%	7
Sun 3p	Cloudy	82°28° (likely 80°27° to 82°28°)	86°30°	30%	10 mph16 km/h from NE, gusts 20 mph33 km/h	69%	45%	6
Sun 4p	Sunny	82°28° (likely 79°26° to 82°28°)	86°30°	30%	10 mph16 km/h from NE, gusts 23 mph37 km/h	69%	33%	5
Sun 5p	Partly sunny	81°27° (likely 78°26° to 82°28°)	85°29°	30%	15 mph24 km/h from NE, gusts 24 mph39 km/h	74%	46%	3
Sun 6p	Rain	81°27° (likely 73°23° to 81°27°)	85°29°	30%	15 mph24 km/h from NE, gusts 33 mph53 km/h	74%	34%	1
Sun 7p	Mostly clear	81°27° (likely 75°24° to 81°27°)	85°29°	30%	15 mph24 km/h from NE, gusts 28 mph44 km/h	74%	29%	0
Sun 8p	Cloudy	80°27° (likely 75°24° to 81°27°)	84°29°	40%, 0.01 in0.3 mm	20 mph32 km/h from NE, gusts 29 mph46 km/h	77%	55%	0
Sun 9p	Mostly clear	80°27° (likely 73°23° to 80°27°)	84°29°	40%, 0.01 in0.3 mm	20 mph32 km/h from NE, gusts 28 mph44 km/h	77%	30%	0
Sun 10p	Clear	80°27° (likely 74°23° to 80°27°)	84°29°	40%, 0.01 in0.3 mm	20 mph32 km/h from NE, gusts 26 mph42 km/h	77%	17%	0
Sun 11p	Mostly clear	80°27° (likely 74°23° to 80°27°)	84°29°	40%, 0.01 in0.3 mm	20 mph32 km/h from NE, gusts 26 mph41 km/h	77%	27%	0
Mon 12a	Mostly clear	80°27° (likely 74°23° to 80°27°)	84°29°	40%, 0.01 in0.3 mm	20 mph32 km/h from NE, gusts 25 mph41 km/h	77%	31%	0
Mon 1a	Clear	80°27° (likely 73°23° to 80°27°)	84°29°	40%, 0.01 in0.3 mm	20 mph32 km/h from NE, gusts 25 mph40 km/h	79%	19%	0
Mon 2a	Clear	79°26° (likely 73°23° to 79°26°)	79°26°	40%, 0.01 in0.3 mm	15 mph24 km/h from N, gusts 26 mph42 km/h	82%	24%	0
Mon 3a	Partly cloudy	79°26° (likely 73°23° to 79°26°)	79°26°	40%, 0.01 in0.3 mm	15 mph24 km/h from N, gusts 23 mph38 km/h	82%	43%	0
Mon 4a	Clear	79°26° (likely 72°22° to 79°26°)	79°26°	40%, 0.01 in0.3 mm	15 mph24 km/h from N, gusts 25 mph40 km/h	82%	29%	0
Mon 5a	Cloudy	79°26° (likely 73°23° to 79°26°)	79°26°	40%, 0.01 in0.3 mm	15 mph24 km/h from N, gusts 24 mph38 km/h	82%	55%	0
Mon 6a	Cloudy	79°26° (likely 73°23° to 79°26°)	79°26°	40%, 0.01 in0.3 mm	15 mph24 km/h from N, gusts 27 mph43 km/h	82%	57%	0
Mon 7a	Drizzle	74°23° (likely 73°23° to 78°26°)	74°23°	40%, 0.01 in0.3 mm	15 mph24 km/h from N, gusts 27 mph43 km/h	97%	43%	0
Mon 8a	Mostly sunny	79°26° (likely 74°23° to 79°26°)	79°26°	60%, 0.01 in0.3 mm	15 mph24 km/h from N, gusts 25 mph41 km/h	82%	28%	0
Mon 9a	Sunny	80°27° (likely 75°24° to 80°27°)	84°29°	60%, 0.01 in0.3 mm	15 mph24 km/h from N, gusts 27 mph43 km/h	79%	25%	1

Days ahead

Shaded: typical range for these dates (1991–2020)

Today, Oct 24. Drizzle. High 81°27°, low 72°22°. Typical 85°29° / 74°23°. Rain 0.11 in2.8 mm, 20% chance. Forecasts agree.
1. Morning
  6 AM–noon
  Cloudy, 80°27°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 81°27°
  Dry
3. Evening
  6 PM–midnight
  Clear, 79°26°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 78°26°
  Dry
Official NWS forecast
Today: A slight chance of rain showers. Mostly sunny, with a high near 81. Northeast wind around 15 mph. Chance of precipitation is 20%.
Tonight: A slight chance of rain showers before 8pm. Mostly clear. Low around 72, with temperatures rising to around 78 overnight. Northeast wind around 15 mph. Chance of precipitation is 20%.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
81°27°–82°28°
Low, likely
72°22°–76°24°
Typical high / low
85°29° / 74°23°
Wind
24 mph38 km/h, gusts 32 mph52 km/h
UV peak
7
Tomorrow, Oct 25. Thunderstorms. High 82°28°, low 74°23°. Typical 85°29° / 74°23°. Storms 0.1 in2.5 mm, 30% chance. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 78°26°
  30% chance
2. Afternoon
  noon–6 PM
  Cloudy, 82°28°
  30% chance
3. Evening
  6 PM–midnight
  Rain, 80°27°
  40% chance · 0.04 in1 mm
4. Overnight
  midnight–6 AM
  Partly cloudy, 79°26°
  40% chance · 0.06 in1.5 mm
Official NWS forecast
Day: A chance of showers and thunderstorms after 8am. Sunny, with a high near 82. North wind 10 to 15 mph. Chance of precipitation is 30%.
Night: A chance of showers and thunderstorms. Mostly clear, with a low around 74. Northeast wind 15 to 20 mph. Chance of precipitation is 40%.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
80°27°–82°28°
Low, likely
71°22°–75°24°
Typical high / low
85°29° / 74°23°
Wind
30 mph48 km/h, gusts 41 mph67 km/h
UV peak
7
Monday, Oct 26. Thunderstorms. High 83°28°, low 74°23°. Typical 84°29° / 74°23°. Storms 0.1 in2.5 mm, 60% chance. Mostly agree.
1. Morning
  6 AM–noon
  Drizzle, 79°26°
  60% chance · 0.04 in1.1 mm
2. Afternoon
  noon–6 PM
  Drizzle, 80°27°
  40% chance · 0.05 in1.4 mm
3. Evening
  6 PM–midnight
  Drizzle, 79°26°
  40% chance · 0.03 in0.6 mm
4. Overnight
  midnight–6 AM
  Mostly clear, 77°25°
  30% chance
Hours this far out come from computer models only.
Official NWS forecast
Day: Showers and thunderstorms likely. Sunny, with a high near 83. Northeast wind around 15 mph. Chance of precipitation is 60%.
Night: Showers and thunderstorms likely. Mostly clear, with a low around 74. Chance of precipitation is 60%.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
78°26°–83°28°
Low, likely
74°23°–78°26°
Typical high / low
84°29° / 74°23°
Wind
28 mph45 km/h, gusts 39 mph62 km/h
UV peak
7
Tuesday, Oct 27. Thunderstorms. High 84°29°, low 77°25°. Typical 84°29° / 74°23°. Storms 0.03 in0.8 mm, 40% chance. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 77°25°
  20% chance
2. Afternoon
  noon–6 PM
  Drizzle, 80°27°
  30% chance · 0.02 in0.5 mm
3. Evening
  6 PM–midnight
  Drizzle, 80°27°
  30% chance · 0.03 in0.6 mm
4. Overnight
  midnight–6 AM
  Drizzle, 78°26°
  30% chance · 0.01 in0.3 mm
Hours this far out come from computer models only.
Official NWS forecast
Day: A chance of showers and thunderstorms before 8am, then a slight chance of showers and thunderstorms. Sunny, with a high near 84. Chance of precipitation is 40%.
Night: A slight chance of showers and thunderstorms. Mostly clear, with a low around 77. Chance of precipitation is 20%.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
79°26°–84°29°
Low, likely
76°24°–78°26°
Typical high / low
84°29° / 74°23°
Wind
26 mph42 km/h, gusts 33 mph53 km/h
UV peak
7
Wednesday, Oct 28. Showers. High 83°28°, low 77°25°. Typical 84°29° / 74°23°. Rain 0.06 in1.5 mm, 20% chance. Mostly agree.
1. Morning
  6 AM–noon
  Drizzle, 78°26°
  30% chance · 0.01 in0.3 mm
2. Afternoon
  noon–6 PM
  Drizzle, 81°27°
  30% chance
3. Evening
  6 PM–midnight
  Drizzle, 80°27°
  30% chance · 0.02 in0.4 mm
4. Overnight
  midnight–6 AM
  Drizzle, 79°26°
  30% chance · 0.04 in0.9 mm
Hours this far out come from computer models only.
Official NWS forecast
Day: A slight chance of showers and thunderstorms. Sunny, with a high near 83. Chance of precipitation is 20%.
Night: A chance of rain showers. Mostly clear, with a low around 77. Chance of precipitation is 30%.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
79°26°–83°28°
Low, likely
77°25°–79°26°
Typical high / low
84°29° / 74°23°
Wind
26 mph42 km/h, gusts 33 mph53 km/h
UV peak
7
Thursday, Oct 29. Showers. High 83°28°, low 77°25°. Typical 84°29° / 74°23°. Rain 0.09 in2.3 mm, 30% chance. Mostly agree.
1. Morning
  6 AM–noon
  Drizzle, 78°26°
  40% chance · 0.03 in0.8 mm
2. Afternoon
  noon–6 PM
  Sunny, 81°27°
  30% chance
3. Evening
  6 PM–midnight
  Drizzle, 81°27°
  30% chance · 0.02 in0.5 mm
4. Overnight
  midnight–6 AM
  Clear, 79°26°
  30% chance · 0.02 in0.5 mm
Hours this far out come from computer models only.
Official NWS forecast
Day: A chance of rain showers. Sunny, with a high near 83. Chance of precipitation is 30%.
Night: A chance of rain showers before 8pm, then a chance of showers and thunderstorms. Mostly clear, with a low around 77. Chance of precipitation is 30%.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
79°26°–83°28°
Low, likely
76°24°–80°27°
Typical high / low
84°29° / 74°23°
Wind
25 mph40 km/h
UV peak
7
Friday, Oct 30. Drizzle. High 83°28°, low 77°25°. Typical 84°29° / 73°23°. Rain 0.09 in2.3 mm, 30% chance. Mostly agree.
1. Morning
  6 AM–noon
  Drizzle, 79°26°
  30% chance · 0.03 in0.8 mm
2. Afternoon
  noon–6 PM
  Sunny, 80°27°
  30% chance · 0.02 in0.5 mm
3. Evening
  6 PM–midnight
  Mostly clear, 80°27°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 79°26°
  30% chance · 0.02 in0.4 mm
Hours this far out come from computer models only.
Official NWS forecast
Day: A chance of showers and thunderstorms. Sunny, with a high near 83. Chance of precipitation is 30%.
Night: A chance of rain showers. Mostly clear, with a low around 77. Chance of precipitation is 30%.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
79°26°–83°28°
Low, likely
76°24°–80°27°
Typical high / low
84°29° / 73°23°
Wind
20 mph33 km/h
UV peak
6
Saturday, Oct 31. Sunny. High 81°27°, low 79°26°. Typical 84°29° / 73°23°. Rain 0.01 in0.3 mm, 30% chance. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 79°26°
  20% chance
2. Afternoon
  noon–6 PM
  Sunny, 81°27°
  Dry
3. Evening
  6 PM–midnight
  Clear, 80°27°
  20% chance
4. Overnight
  midnight–6 AM
  Clear, 79°26°
  20% chance
Hours this far out come from computer models only.
The National Weather Service writes about seven days ahead; this day is our model forecast only.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
78°26°–83°28°
Low, likely
74°23°–81°27°
Typical high / low
84°29° / 73°23°
Wind
22 mph36 km/h
UV peak
6
Sunday, Nov 1. Drizzle. High 81°27°, low 79°26°. Typical 83°28° / 73°23°. Rain 0.04 in1 mm, 30% chance. Mostly agree.
1. Morning
  6 AM–noon
  Drizzle, 79°26°
  20% chance · 0.02 in0.5 mm
2. Afternoon
  noon–6 PM
  Sunny, 81°27°
  20% chance · 0.01 in0.3 mm
3. Evening
  6 PM–midnight
  Drizzle, 80°27°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 79°26°
  Dry
Hours this far out come from computer models only.
The National Weather Service writes about seven days ahead; this day is our model forecast only.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
77°25°–83°28°
Low, likely
74°23°–82°28°
Typical high / low
83°28° / 73°23°
Wind
22 mph36 km/h
UV peak
6
Monday, Nov 2. Cloudy. High 80°27°, low 78°26°. Typical 83°28° / 73°23°. Rain 0.06 in1.5 mm, 20% chance. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 79°26°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 80°27°
  Dry
3. Evening
  6 PM–midnight
  Partly cloudy, 79°26°
  Dry
Hours this far out come from computer models only.
The National Weather Service writes about seven days ahead; this day is our model forecast only.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
76°24°–82°28°
Low, likely
74°23°–81°27°
Typical high / low
83°28° / 73°23°
Wind
23 mph37 km/h, gusts 30 mph49 km/h
UV peak
6

10 days15 days30 days

The outlook

Today
Dry, high 81°, low 72°.
Tomorrow
31% chance of rain, high 82°, low 74°.
Monday
56% chance of rain, high 83°, low 74°.
Rest of week
Mostly dry, highs 80–84°.

Want the meteorologists’ reasoning? Read the NWS forecast discussion (KEY) (opens in a new tab)

What changed since yesterday

No meaningful changes from yesterday’s forecast.

Radar

Radar data: NOAA MRMS, rendered by forecast.blue

Radar loads when scrolled into view

Full-screen radar

For your home

What this week’s weather means for heating, cooling, pipes and fresh air.

Cooling this week

About 71% less cooling than a typical week.

This week 28Typical 99

Cooling degree days, base 65°F

Comfort

Sticky, humid air (dew point 68°F).

Open the windows?

No stretch in the next few days is comfortable enough outside, by temperature, dew point and air quality.

Is this typical?

Marathon Airport · official normals 1991–2020 · records 1998–2026

Oct 24, today vs a typical year

Today’s expected high is 4°2° colder than typical.

Last 7 days vs normal

On average 1° colder than normal (daily mean temperature).

±0°SunOct 18
+1°MonOct 19
−1°TueOct 20
−1°WedOct 21
−1°ThuOct 22
−2°−1°FriOct 23
—SatOct 24

Marathon weather by month: normals, records, snow and freeze dates

Sun & moon

Sun

Daylight: 11 h 23 min; Losing 1 min 20 s a day; shortest Dec 21, 46 min less
Golden hour: 6:18–7:03 PM; Morning 7:12–7:57 AM
Blue hour: 7:03–7:12 PM; Morning 7:03–7:12 AM; first light 7:03 AM

Stars tonight? Fair

Mostly clear 10 PM–7:04 AM, but the moon is 99% lit and up.

Moon

Waxing gibbous

97% lit · growing

Today: sets 5:47 AM · rises 5:42 PM
Full moon: Oct 26
New moon: Nov 9

Looking south from Marathon. Open water to the horizon.Skyline from USGS elevation data, heights drawn up to 6× taller. Sky, sun and moon as they are now.

1 active weather alert

Coastal Flood Advisory