Water Temperature of the Gulf of Mexico in Key West, FL

Current Water Temperature

87.1°F

Measurement Time: Thursday, September 18, 2025, 4:24 PM EDT

Today's Tides

 Low: September 18, 1:04 AM, 0.92 ft
High: September 18, 8:10 AM, 2.24 ft
 Low: September 18, 2:43 PM, 0.50 ft
High: September 18, 9:18 PM, 1.61 ft

Temperature Locations

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Local Points of Interest

Mallory Square; Tank Island; Florida Keys

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Gulf of Mexico

Station Name: Key West
Data Source: NOAA Tides and Currents

Elevation Above Sea Level: 13 feet / 4 meters

Sensor Depth: -3.6 feet / -1.1 meters

Nearest Address:
21 Angela St
Key West, FL 33040
Monroe County

GPS Coordinates: 24.55083, -81.80806

Nearby Water Temperatures

Atlantic Ocean, Key West, FL (14.1 mi)
Gulf of Mexico, Marathon, FL (45.4 mi)
East Side Creek, Flamingo, FL (61.8 mi)
Joe Kemp Channel, Flamingo, FL (66.5 mi)
Florida Bay, Islamorada, FL (68.4 mi)
Shark River, Flamingo, FL (70.9 mi)
Florida Bay, Islamorada, FL (71.3 mi)
Whitewater Bay, Flamingo, FL (72.0 mi)
Gulf of Mexico, Flamingo, FL (72.6 mi)
Whipray Basin, Islamorada, FL (76.3 mi)
Harney River, Flamingo, FL (76.4 mi)
Florida Bay, Islamorada, FL (78.0 mi)
Seven Palm Lake, Flamingo, FL (80.5 mi)
Broad River, Flamingo, FL (82.1 mi)
Little Madeira Bay, Homestead, FL (85.4 mi)

Weather for Key West, Florida

Current Weather

80.1°F
Partly cloudy
Conditions: Partly cloudy
Humidity: 87%
Feels Like: 85.7°F
Wind: NE 13.4 mph
Wind Gusts: 21.5 mph
Pressure: 29.91 in
Precipitation: 0 in
Cloud Cover: 50%
Visibility: 9 mi
UV Index: 5.6

Five Day Weather Forecast

Heavy rain
Thu
H: 82°F
L: 78°F
Sunny
Fri
H: 85°F
L: 81°F
Partly Cloudy
Sat
H: 84°F
L: 82°F
Patchy rain nearby
Sun
H: 84°F
L: 82°F
Moderate rain
Mon
H: 84°F
L: 81°F

Air Quality

AQI: 1 - Good
PM2.5: 4.26 μg/m3
PM10: 6.48 μg/m3
Carbon Monoxide: 181.3 μg/m3
Nitrogen Dioxide: 1.3 μg/m3
Sulphur Dioxide: 0.37 μg/m3
Ozone: 54 μg/m3

Astronomical

Sunrise: 7:14 AM
Sun Transit: 1:21 PM
Sunset: 7:27 PM
Daylight: 12 hrs 13 mins
Moonrise: 4:14 AM
Moon Transit: 11:03 AM
Moonset: 5:46 PM
Moon Phase: Waning Crescent
Moon Illumination: 7.8%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
10:33 AM - 1:03 PM

Minor Periods

5:16 PM - 6:46 PM
3:44 AM - 5:14 AM

Action Rating: 2 out of 5

Coastal Flood Statement issued September 18 at 10:01AM EDT until September 19 at 6:00AM EDT by NWS Key West FL

Effective: Thu September 18, 2025, 10:01 AM
Expires: Thu September 18, 2025, 6:00 PM

* WHAT...Minor saltwater flooding. * WHERE...Upper Florida Keys. * WHEN...Through late tonight. * IMPACTS...Minor saltwater flooding of low elevation streets and lots is likely. 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.

Do not drive through flooded roadways.


Coastal Flood Statement issued September 18 at 10:01AM EDT until September 19 at 6:00AM EDT by NWS Key West FL

Effective: Thu September 18, 2025, 10:01 AM
Expires: Thu September 18, 2025, 6:00 PM

* WHAT...Minor saltwater flooding. * WHERE...Upper Florida Keys. * WHEN...Through late tonight. * IMPACTS...Minor saltwater flooding of low elevation streets and lots is likely. 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.

Do not drive through flooded roadways.
Thursday, September 18, 2025

Weather Forecast

Conditions: Heavy rain
Average Temperature: 81.1°F
Average Humidity: 82%
Chance of Rain: 88%
Wind: 21.5 mph
UV Index: 2.3

Air Quality

AQI: 1 - Good
PM2.5: 5.72 μg/m3
PM10: 8.95 μg/m3
Carbon Monoxide: 182.85 μg/m3
Nitrogen Dioxide: 1.18 μg/m3
Sulphur Dioxide: 0.35 μg/m3
Ozone: 56.48 μg/m3

Astronomical

Sunrise: 7:14 AM
Sun Transit: 1:21 PM
Sunset: 7:27 PM
Daylight: 12 hrs 13 mins
Moonrise: 4:14 AM
Moon Transit: 11:03 AM
Moonset: 5:46 PM
Moon Phase: Waning Crescent
Moon Illumination: 7.8%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
10:33 AM - 1:03 PM

Minor Periods

5:16 PM - 6:46 PM
3:44 AM - 5:14 AM

Action Rating: 2 out of 5

Friday, September 19, 2025

Weather Forecast

Conditions: Sunny
Average Temperature: 82.5°F
Average Humidity: 82%
Chance of Rain: 0%
Wind: 11.6 mph
UV Index: 2.4

Air Quality

AQI: 1 - Good
PM2.5: 5.27 μg/m3
PM10: 7.82 μg/m3
Carbon Monoxide: 188.18 μg/m3
Nitrogen Dioxide: 1.68 μg/m3
Sulphur Dioxide: 0.78 μg/m3
Ozone: 58.92 μg/m3

Astronomical

Sunrise: 7:15 AM
Sun Transit: 1:20 PM
Sunset: 7:26 PM
Daylight: 12 hrs 11 mins
Moonrise: 5:12 AM
Moon Transit: 11:49 AM
Moonset: 6:21 PM
Moon Phase: Waning Crescent
Moon Illumination: 2.8%

Best Times for Fishing or Hunting

Major Periods

12:04 AM - 2:34 AM
11:19 AM - 1:49 PM

Minor Periods

5:51 PM - 7:21 PM
4:42 AM - 6:12 AM

Action Rating: 3 out of 5

Saturday, September 20, 2025

Weather Forecast

Conditions: Partly Cloudy
Average Temperature: 83.4°F
Average Humidity: 85%
Chance of Rain: 0%
Wind: 13.4 mph
UV Index: 2.4

Air Quality

AQI: 1 - Good
PM2.5: 7.02 μg/m3
PM10: 10.05 μg/m3
Carbon Monoxide: 199.58 μg/m3
Nitrogen Dioxide: 2.35 μg/m3
Sulphur Dioxide: 1.17 μg/m3
Ozone: 69.88 μg/m3

Astronomical

Sunrise: 7:15 AM
Sun Transit: 1:20 PM
Sunset: 7:25 PM
Daylight: 12 hrs 10 mins
Moonrise: 6:08 AM
Moon Transit: 12:32 AM
Moonset: 6:52 PM
Moon Phase: Waning Crescent
Moon Illumination: 0.3%

Best Times for Fishing or Hunting

Major Periods

12:48 AM - 3:18 AM
12:02 AM - 2:32 PM

Minor Periods

6:22 PM - 7:52 PM
5:38 AM - 7:08 AM

Action Rating: 4 out of 5

Sunday, September 21, 2025

Weather Forecast

Conditions: Patchy rain nearby
Average Temperature: 83.4°F
Average Humidity: 78%
Chance of Rain: 73%
Wind: 11.6 mph
UV Index: 2.5

Air Quality

AQI: 1 - Good
PM2.5: 5.14 μg/m3
PM10: 7.73 μg/m3
Carbon Monoxide: 188.7 μg/m3
Nitrogen Dioxide: 1.45 μg/m3
Sulphur Dioxide: 0.62 μg/m3
Ozone: 62 μg/m3

Astronomical

Sunrise: 7:15 AM
Sun Transit: 1:20 PM
Sunset: 7:24 PM
Daylight: 12 hrs 9 mins
Moonrise: 7:01 AM
Moon Transit: 1:14 PM
Moonset: 7:21 PM
Moon Phase: New
Moon Illumination: 0.3%

Best Times for Fishing or Hunting

Major Periods

1:31 AM - 4:01 AM
12:44 AM - 3:14 PM

Minor Periods

6:51 PM - 8:21 PM
6:31 AM - 8:01 AM

Action Rating: 3 out of 5

Monday, September 22, 2025

Weather Forecast

Conditions: Moderate rain
Average Temperature: 83.1°F
Average Humidity: 74%
Chance of Rain: 87%
Wind: 13.4 mph
UV Index: 0

Air Quality

AQI: 1 - Good
PM2.5: 3.97 μg/m3
PM10: 6.35 μg/m3
Carbon Monoxide: 182.01 μg/m3
Nitrogen Dioxide: 1.57 μg/m3
Sulphur Dioxide: 0.46 μg/m3
Ozone: 50.62 μg/m3

Astronomical

Sunrise: 7:16 AM
Sun Transit: 1:19 PM
Sunset: 7:23 PM
Daylight: 12 hrs 7 mins
Moonrise: 7:53 AM
Moon Transit: 1:54 PM
Moonset: 7:50 PM
Moon Phase: New
Moon Illumination: 2.9%

Best Times for Fishing or Hunting

Major Periods

2:11 AM - 4:41 AM
1:24 PM - 3:54 PM

Minor Periods

7:20 PM - 8:50 PM
7:23 AM - 8:53 AM

Action Rating: 5 out of 5

The times presented here are based upon the solunar theory, which is the idea that the movements of fish and other animals are affected by the location of the sun and moon. The major periods are believed to be the times of the greatest animal activity and occur when the moon is directly overhead or underfoot (lunar transits). The minor periods also see increased activity and occur when the moon is rising or setting. The strongest activity occurs during full or new moons, and the weakest during quarter or three quarter moons. This is indicated by the Action Rating.

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