Coastal Flood Advisory
Ends in 1 day 5 h
When
Until 5 AM EDT Monday.
Where
Middle and Lower Florida Keys.
Issued for this forecast zone · National Weather Service Key West FL
What, impacts and precautionsHide details
What
Minor to moderate 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 10:53 PM EDT at KNQX

Big Coppitt Key, FL weather

Clear and 78°26°, gusts to 32 mph51 km/h tomorrow.

Forecasts agree

Now 78°26°

Clear

Wind: 18 mph29 km/hgusts 26 mph42 km/h; From the north-northeast. 1016–18 mph29 km/h through 11 AM
Dew point: 63°17°; Sticky · up to 71°22° by 8 AM (oppressive)
UV tomorrow: 7High; High 12–4 PM · peak 7
Pressure: 30.02 inHg1017 hPa; Rising slowly · +0.02 inHg+0.6 hPa in 3 h

None rain now, through the next 2 hours.

From forecast models

Next 48 hours

About the same as this time yesterday (77°25° then, 78°26° now)

Good hours for

Gusts to 26 mph42 km/h until 2 AM
Low 76°24° tomorrow at 6 AM
Gusts to 34 mph55 km/h tomorrow from 5 PM
High 83°28° tomorrow at 5 PM
Rain Monday 2–8 PM (40%, 0.18 in4.6 mm)

TonightNear 78°26° · rain chance 10% · gusts to 26 mph42 km/h · Clear
Tomorrow morningNear 77°25° · rain chance 30% · Clear
Tomorrow afternoonUp to 83°28° by 5 PM · rain chance 30% · gusts to 26 mph42 km/h · Partly cloudy
Tomorrow nightDown to 78°26° by 2 AM · rain chance 40% · gusts to 32 mph51 km/h · Partly cloudy
Monday morningNear 79°26° · rain chance 40% · gusts to 32 mph51 km/h · Partly cloudy
Monday afternoonNear 81°27° · Rain 2–6 PM (40%) · gusts to 32 mph51 km/h
Monday nightNear 81°27° · Rain 6–8 PM (40%) · gusts to 34 mph55 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 11p	Clear	79°26° (likely 77°25° to 80°27°)	79°26°	10%	15 mph24 km/h from NE, gusts 26 mph42 km/h	69%	6%	0
Sun 12a	Clear	79°26° (likely 77°25° to 80°27°)	79°26°	10%	15 mph24 km/h from NE, gusts 25 mph41 km/h	69%	2%	0
Sun 1a	Clear	78°26° (likely 76°24° to 79°26°)	78°26°	10%	15 mph24 km/h from NE, gusts 26 mph41 km/h	71%	2%	0
Sun 2a	Clear	78°26° (likely 75°24° to 79°26°)	78°26°	10%	15 mph24 km/h from N, gusts 25 mph39 km/h	74%	5%	0
Sun 3a	Clear	77°25° (likely 74°23° to 78°26°)	77°25°	10%	15 mph24 km/h from N, gusts 25 mph40 km/h	76%	9%	0
Sun 4a	Clear	77°25° (likely 74°23° to 78°26°)	77°25°	10%	15 mph24 km/h from N, gusts 23 mph38 km/h	76%	13%	0
Sun 5a	Clear	77°25° (likely 74°23° to 77°25°)	77°25°	10%	15 mph24 km/h from N, gusts 24 mph39 km/h	79%	14%	0
Sun 6a	Clear	76°24° (likely 73°23° to 77°25°)	76°24°	10%	15 mph24 km/h from N, gusts 23 mph36 km/h	82%	18%	0
Sun 7a	Sunny	76°24° (likely 73°23° to 77°25°)	76°24°	10%	15 mph24 km/h from N, gusts 20 mph33 km/h	82%	17%	0
Sun 8a	Sunny	76°24° (likely 74°23° to 77°25°)	76°24°	30%	15 mph24 km/h from N, gusts 21 mph34 km/h	85%	23%	0
Sun 9a	Mostly sunny	77°25° (likely 76°24° to 77°25°)	77°25°	30%	15 mph24 km/h from N, gusts 19 mph31 km/h	85%	29%	1
Sun 10a	Sunny	77°25° (likely 77°25° to 78°26°)	77°25°	30%	15 mph24 km/h from N, gusts 19 mph30 km/h	82%	23%	2
Sun 11a	Mostly sunny	78°26° (likely 77°25° to 80°27°)	78°26°	30%	10 mph16 km/h from N, gusts 20 mph31 km/h	79%	27%	4
Sun 12p	Sunny	79°26° (likely 78°26° to 81°27°)	79°26°	30%	10 mph16 km/h from N, gusts 20 mph33 km/h	79%	18%	6
Sun 1p	Mostly sunny	79°26° (likely 79°26° to 81°27°)	79°26°	30%	10 mph16 km/h from N, gusts 22 mph36 km/h	79%	28%	7
Sun 2p	Mostly sunny	81°27° (likely 79°26° to 82°28°)	85°29°	30%	10 mph16 km/h from N, gusts 21 mph33 km/h	74%	35%	7
Sun 3p	Partly sunny	81°27° (likely 80°27° to 83°28°)	86°30°	30%	10 mph16 km/h from N, gusts 22 mph35 km/h	77%	43%	6
Sun 4p	Partly sunny	81°27° (likely 79°26° to 83°28°)	85°29°	30%	10 mph16 km/h from N, gusts 24 mph39 km/h	74%	45%	5
Sun 5p	Cloudy	83°28° (likely 79°26° to 83°28°)	88°31°	30%	15 mph24 km/h from NE, gusts 26 mph41 km/h	70%	54%	3
Sun 6p	Sunny	82°28° (likely 79°26° to 82°28°)	87°31°	30%	15 mph24 km/h from NE, gusts 23 mph37 km/h	72%	16%	1
Sun 7p	Clear	81°27° (likely 76°24° to 81°27°)	85°29°	30%	15 mph24 km/h from NE, gusts 28 mph45 km/h	74%	35%	0
Sun 8p	Clear	81°27° (likely 76°24° to 81°27°)	86°30°	40%	15 mph24 km/h from NE, gusts 32 mph51 km/h	77%	28%	0
Sun 9p	Cloudy	80°27° (likely 75°24° to 80°27°)	84°29°	40%	15 mph24 km/h from NE, gusts 32 mph51 km/h	79%	69%	0
Sun 10p	Clear	79°26° (likely 76°24° to 79°26°)	79°26°	40%	15 mph24 km/h from NE, gusts 30 mph49 km/h	82%	23%	0
Sun 11p	Clear	79°26° (likely 75°24° to 79°26°)	79°26°	40%	15 mph24 km/h from NE, gusts 29 mph46 km/h	82%	26%	0
Mon 12a	Clear	79°26° (likely 76°24° to 79°26°)	79°26°	40%	15 mph24 km/h from NE, gusts 29 mph47 km/h	85%	31%	0
Mon 1a	Cloudy	79°26° (likely 74°23° to 79°26°)	79°26°	40%	15 mph24 km/h from NE, gusts 31 mph49 km/h	82%	73%	0
Mon 2a	Mostly clear	78°26° (likely 74°23° to 78°26°)	78°26°	40%	15 mph24 km/h from NE, gusts 31 mph50 km/h	88%	44%	0
Mon 3a	Clear	78°26° (likely 74°23° to 78°26°)	78°26°	40%	15 mph24 km/h from NE, gusts 30 mph48 km/h	88%	31%	0
Mon 4a	Clear	78°26° (likely 74°23° to 78°26°)	78°26°	40%	15 mph24 km/h from NE, gusts 29 mph47 km/h	85%	33%	0
Mon 5a	Clear	78°26° (likely 74°23° to 78°26°)	78°26°	40%	15 mph24 km/h from NE, gusts 29 mph46 km/h	85%	24%	0
Mon 6a	Partly cloudy	78°26° (likely 74°23° to 78°26°)	78°26°	40%	15 mph24 km/h from NE, gusts 28 mph45 km/h	85%	51%	0
Mon 7a	Partly sunny	77°25° (likely 74°23° to 78°26°)	77°25°	40%	15 mph24 km/h from NE, gusts 29 mph47 km/h	88%	46%	0
Mon 8a	Mostly sunny	78°26° (likely 74°23° to 78°26°)	78°26°	40%	15 mph24 km/h from NE, gusts 30 mph48 km/h	88%	31%	0
Mon 9a	Sunny	78°26° (likely 76°24° to 78°26°)	78°26°	40%	15 mph24 km/h from NE, gusts 31 mph50 km/h	88%	24%	1
Mon 10a	Cloudy	79°26° (likely 76°24° to 79°26°)	79°26°	40%	15 mph24 km/h from NE, gusts 32 mph52 km/h	85%	58%	2
Mon 11a	Mostly sunny	79°26° (likely 78°26° to 79°26°)	79°26°	40%	15 mph24 km/h from NE, gusts 30 mph48 km/h	85%	28%	4
Mon 12p	Sunny	80°27° (likely 79°26° to 80°27°)	85°29°	40%	15 mph24 km/h from NE, gusts 31 mph50 km/h	82%	21%	6
Mon 1p	Partly sunny	81°27° (likely 80°27° to 81°27°)	86°30°	40%	15 mph24 km/h from NE, gusts 32 mph51 km/h	79%	46%	7
Mon 2p	Mostly sunny	82°28° (likely 81°27° to 82°28°)	88°31°	40%, 0.03 in0.8 mm	15 mph24 km/h from NE, gusts 31 mph49 km/h	77%	30%	7
Mon 3p	Sunny	82°28° (likely 81°27° to 83°28°)	88°31°	40%, 0.03 in0.8 mm	15 mph24 km/h from NE, gusts 31 mph49 km/h	77%	21%	6
Mon 4p	Mostly sunny	82°28° (likely 81°27° to 83°28°)	87°31°	40%, 0.03 in0.8 mm	15 mph24 km/h from NE, gusts 29 mph46 km/h	74%	38%	5
Mon 5p	Mostly sunny	82°28° (likely 81°27° to 83°28°)	87°31°	40%, 0.03 in0.8 mm	15 mph24 km/h from NE, gusts 31 mph49 km/h	74%	33%	3
Mon 6p	Sunny	82°28° (likely 79°26° to 82°28°)	87°31°	40%, 0.03 in0.8 mm	15 mph24 km/h from NE, gusts 28 mph45 km/h	74%	25%	1
Mon 7p	Clear	81°27° (likely 76°24° to 82°28°)	86°30°	40%, 0.03 in0.8 mm	15 mph24 km/h from NE, gusts 32 mph52 km/h	79%	34%	0
Mon 8p	Clear	81°27° (likely 77°25° to 81°27°)	86°30°	30%	15 mph24 km/h from NE, gusts 31 mph50 km/h	79%	16%	0
Mon 9p	Clear	80°27° (likely 79°26° to 81°27°)	85°29°	30%	15 mph24 km/h from NE, gusts 33 mph54 km/h	82%	19%	0
Mon 10p	Clear	80°27° (likely 78°26° to 80°27°)	84°29°	30%	15 mph24 km/h from NE, gusts 34 mph55 km/h	79%	21%	0

Days ahead

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

Today, Oct 24. Cloudy. High 82°28°, low 75°24°. Typical 85°29° / 76°24°. Rain 0.07 in1.8 mm, 40% chance. Forecasts agree.
1. Overnight
  midnight–6 AM
  Clear, 77°25°
  Dry
Official NWS forecast
Tonight: Mostly clear, with a low around 75. Northeast wind around 15 mph.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
81°27°–83°28°
Low, likely
74°23°–75°24°
Typical high / low
85°29° / 76°24°
Wind
24 mph38 km/h, gusts 32 mph52 km/h
UV peak
7
Tomorrow, Oct 25. Thunderstorms. High 83°28°, low 76°24°. Typical 84°29° / 76°24°. Storms 0.04 in1 mm, 30% chance. Mostly agree.
1. Morning
  6 AM–noon
  Mostly sunny, 76°24°
  30% chance
2. Afternoon
  noon–6 PM
  Partly sunny, 83°28°
  30% chance
3. Evening
  6 PM–midnight
  Cloudy, 81°27°
  40% chance
4. Overnight
  midnight–6 AM
  Clear, 78°26°
  40% chance
Official NWS forecast
Day: A chance of showers and thunderstorms after 8am. Sunny, with a high near 83. Northeast wind 10 to 15 mph. Chance of precipitation is 30%.
Night: A chance of showers and thunderstorms. Mostly clear, with a low around 76. Northeast wind around 15 mph. Chance of precipitation is 40%.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
80°27°–83°28°
Low, likely
73°23°–77°25°
Typical high / low
84°29° / 76°24°
Wind
29 mph47 km/h, gusts 41 mph65 km/h
UV peak
7
Monday, Oct 26. Thunderstorms. High 84°29°, low 77°25°. Typical 84°29° / 75°24°. Storms 0.06 in1.5 mm, 40% chance. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 78°26°
  40% chance
2. Afternoon
  noon–6 PM
  Sunny, 82°28°
  40% chance · 0.12 in3 mm
3. Evening
  6 PM–midnight
  Clear, 81°27°
  40% chance · 0.06 in1.5 mm
4. Overnight
  midnight–6 AM
  Cloudy, 77°25°
  Dry
Official NWS forecast
Day: A chance of showers and thunderstorms. Sunny, with a high near 84. Northeast wind around 15 mph. Chance of precipitation is 40%.
Night: A chance of showers and thunderstorms. Mostly clear, with a low around 77. Northeast wind around 15 mph. Chance of precipitation is 40%.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
81°27°–84°29°
Low, likely
75°24°–78°26°
Typical high / low
84°29° / 75°24°
Wind
29 mph47 km/h, gusts 40 mph65 km/h
UV peak
7
Tuesday, Oct 27. Thunderstorms. High 84°29°, low 78°26°. Typical 84°29° / 75°24°. Storms 0.02 in0.5 mm, 30% chance. Mostly agree.
1. Morning
  6 AM–noon
  Partly sunny, 78°25°
  Dry
2. Afternoon
  noon–6 PM
  Drizzle, 81°27°
  Dry
3. Evening
  6 PM–midnight
  Clear, 80°27°
  20% chance
4. Overnight
  midnight–6 AM
  Drizzle, 78°26°
  20% chance · 0.01 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 84. Chance of precipitation is 30%.
Night: A slight chance of rain showers before 8pm, then a slight chance of showers and thunderstorms. Mostly clear, with a low around 78. Chance of precipitation is 20%.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
80°27°–84°29°
Low, likely
77°25°–78°26°
Typical high / low
84°29° / 75°24°
Wind
27 mph44 km/h, gusts 38 mph61 km/h
UV peak
7
Wednesday, Oct 28. Thunderstorms. High 84°29°, low 78°26°. Typical 84°29° / 75°24°. Storms 0.06 in1.5 mm, 20% chance. Forecasts agree.
1. Morning
  6 AM–noon
  Drizzle, 78°26°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 81°27°
  Dry
3. Evening
  6 PM–midnight
  Drizzle, 81°27°
  30% chance · 0.06 in1.4 mm
4. Overnight
  midnight–6 AM
  Mostly clear, 79°26°
  30% chance · 0.02 in0.5 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 84. Chance of precipitation is 20%.
Night: A slight chance of rain showers before 8pm, then a slight chance of showers and thunderstorms. Mostly clear, with a low around 78. Chance of precipitation is 20%.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
80°27°–84°29°
Low, likely
77°25°–78°26°
Typical high / low
84°29° / 75°24°
Wind
27 mph43 km/h, gusts 38 mph61 km/h
UV peak
7
Thursday, Oct 29. Thunderstorms. High 84°29°, low 78°26°. Typical 84°29° / 75°24°. Storms 0.1 in2.5 mm, 20% chance. Mostly agree.
1. Morning
  6 AM–noon
  Drizzle, 79°26°
  30% chance · 0.05 in1.1 mm
2. Afternoon
  noon–6 PM
  Sunny, 82°28°
  20% chance
3. Evening
  6 PM–midnight
  Clear, 81°27°
  20% chance
4. Overnight
  midnight–6 AM
  Clear, 79°26°
  20% chance
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 84. Chance of precipitation is 20%.
Night: A slight chance of showers and thunderstorms. Mostly clear, with a low around 78. Chance of precipitation is 20%.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
80°27°–84°29°
Low, likely
78°26°–80°27°
Typical high / low
84°29° / 75°24°
Wind
21 mph34 km/h, gusts 28 mph45 km/h
UV peak
7
Friday, Oct 30. Showers. High 84°29°, low 78°26°. Typical 84°29° / 75°24°. Rain 0.04 in1 mm, 20% chance. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 80°26°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 81°27°
  Dry
3. Evening
  6 PM–midnight
  Clear, 80°27°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 80°26°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: A slight chance of rain showers. Sunny, with a high near 84. Chance of precipitation is 20%.
Night: A slight chance of rain showers. Mostly clear, with a low around 78. Chance of precipitation is 20%.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
80°27°–84°29°
Low, likely
78°26°–80°27°
Typical high / low
84°29° / 75°24°
Wind
20 mph31 km/h
UV peak
6
Saturday, Oct 31. Showers. High 84°29°, low 80°27°. Typical 83°28° / 75°24°. Rain 0.03 in0.8 mm, 10% chance. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 80°26°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 82°28°
  Dry
3. Evening
  6 PM–midnight
  Clear, 81°27°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 80°27°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: A slight chance of rain showers. Sunny, with a high near 84.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
79°26°–84°29°
Low, likely
78°26°–81°27°
Typical high / low
83°28° / 75°24°
Wind
20 mph33 km/h
UV peak
6
Sunday, Nov 1. Drizzle. High 81°27°, low 79°26°. Typical 83°28° / 74°23°. Rain 0.07 in1.8 mm, 20% chance. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 80°27°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 81°27°
  Dry
3. Evening
  6 PM–midnight
  Clear, 80°27°
  Dry
4. Overnight
  midnight–6 AM
  Drizzle, 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
80°27°–83°28°
Low, likely
78°26°–80°27°
Typical high / low
83°28° / 74°23°
Wind
22 mph35 km/h
UV peak
6
Monday, Nov 2. Drizzle. High 81°27°, low 79°26°. Typical 83°28° / 74°23°. Rain 0.17 in4.3 mm, 20% chance. Forecasts agree.
1. Morning
  6 AM–noon
  Mostly sunny, 78°26°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 80°27°
  Dry
3. Evening
  6 PM–midnight
  Clear, 80°27°
  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.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
80°27°–81°27°
Low, likely
78°26°–79°26°
Typical high / low
83°28° / 74°23°
Wind
21 mph34 km/h
UV peak
6

10 days15 days30 days

The outlook

Today
Dry, high 82°, low 75°.
Tomorrow
Dry, high 83°, low 76°.
Monday
40% chance of rain, high 84°, low 77°.
Rest of week
Mostly dry, highs 81–84°.

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 73% less cooling than a typical week.

This week 28Typical 103

Cooling degree days, base 65°F

Comfort

Sticky, humid air (dew point 63°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?

Key West International Airport · official normals 1991–2020 · records 1872–2026

Oct 24, today vs a typical year

Today’s expected high is 3°2° colder than typical.

Last 7 days vs normal

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

+2°+1°MonOct 19
±0°TueOct 20
−2°−1°WedOct 21
−3°−2°ThuOct 22
−2°−1°FriOct 23
—SatOct 24
—SunOct 25

Big Coppitt Key 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: 6:21–7:06 PM; Morning 7:14–8:00 AM
Blue hour: 7:06–7:15 PM; Morning 7:05–7:14 AM; first light 7:05 AM

Stars tonight? Fair

Clear 11:33 PM–7:06 AM, but the moon is 99% lit and up.

Moon

Waxing gibbous

98% lit · growing

Today: sets 5:49 AM · rises 5:45 PM
Full moon: Oct 26
New moon: Nov 9

Looking south from Big Coppitt Key. 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