Water Temperature of Long Sound Near Key Largo, FL

Current Water Temperature

90.0°F

Measurement Time: Friday, July 18, 2025, 5:00 PM EDT

Temperature Locations

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Local Points of Interest

Little Blackwater Sound; Florida Bay; Barnes Sound; Florida Keys National Marine Sactuary; Everglades National Park; Florida Keys; Gulf of Mexico

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Long Sound

Station Name: Long Sound, FL
Station Type: Fixed
Data Source: National Data Buoy Center

Elevation Above Sea Level: 0 feet / 0 meters

Nearest Address:
Offshore
Key Largo, FL 33037
Monroe County

GPS Coordinates: 25.235, -80.457

Nearby Water Temperatures

West Highway Creek, Key Largo, FL (0.8 mi)
Little Blackwater Sound, Key Largo, FL (2.1 mi)
Manatee Bay, Homestead, FL (2.2 mi)
Joe Bay, Key Largo, FL (4.2 mi)
Joe Bay, Key Largo, FL (5.3 mi)
Barnes Sound, Key Largo, FL (5.3 mi)
Florida Bay, Key Largo, FL (10.9 mi)
Little Madeira Bay, Homestead, FL (11.7 mi)
Taylor River, Homestead, FL (11.8 mi)
Taylor River, Homestead, FL (12.1 mi)
Taylor Slough, Homestead, FL (14.2 mi)
Seven Palm Lake, Flamingo, FL (17.1 mi)
Mowry Canal Number C-103, Homestead, FL (17.7 mi)
Florida Bay, Islamorada, FL (20.1 mi)
Whipray Basin, Islamorada, FL (20.7 mi)

Weather Near Key Largo, Florida

Current Weather

85.8°F
Sunny
Conditions: Sunny
Humidity: 74%
Feels Like: 101.1°F
Wind: ENE 15 mph
Wind Gusts: 21.4 mph
Pressure: 30.09 in
Precipitation: 0 in
Cloud Cover: 25%
Visibility: 9 mi
UV Index: 0

Five Day Weather Forecast

Sunny
Fri
H: 89°F
L: 84°F
Partly Cloudy
Sat
H: 85°F
L: 82°F
Sunny
Sun
H: 85°F
L: 82°F
Sunny
Mon
H: 85°F
L: 82°F
Patchy rain nearby
Tue
H: 84°F
L: 82°F

Air Quality

AQI: 1 - Good
PM2.5: 22.39 μg/m3
PM10: 66.6 μg/m3
Carbon Monoxide: 183.15 μg/m3
Nitrogen Dioxide: 1.85 μg/m3
Sulphur Dioxide: 0.74 μg/m3
Ozone: 46 μg/m3

Astronomical

Sunrise: 6:43 AM
Sun Transit: 1:28 PM
Sunset: 8:14 PM
Daylight: 13 hrs 31 mins
Moonrise: 12:51 AM
Moon Transit: 7:30 AM
Moonset: 2:17 PM
Moon Phase: Last Quarter
Moon Illumination: 33.4%

Best Times for Fishing or Hunting

Major Periods

7:00 AM - 9:30 AM
8:45 PM - 11:15 PM

Minor Periods

1:47 PM - 3:17 PM
12:21 AM - 1:51 AM

Action Rating: 3 out of 5

Heat Advisory issued July 18 at 3:04AM EDT until July 18 at 6:00PM EDT by NWS Miami FL

Effective: Fri July 18, 2025, 3:04 AM
Expires: Fri July 18, 2025, 6:00 PM

* WHAT...Heat index values of 105-111 expected. * WHERE...Portions of southeast, southern, and southwest Florida. * WHEN...From 11 AM this morning to 6 PM EDT this evening. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses.

Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1.


Heat Advisory issued July 18 at 3:04AM EDT until July 18 at 6:00PM EDT by NWS Miami FL

Effective: Fri July 18, 2025, 3:04 AM
Expires: Fri July 18, 2025, 6:00 PM

* WHAT...Heat index values of 105-111 expected. * WHERE...Portions of southeast, southern, and southwest Florida. * WHEN...From 11 AM this morning to 6 PM EDT this evening. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses.

Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1.


Rip Current Statement issued July 18 at 8:14AM EDT until July 18 at 8:00PM EDT by NWS Miami FL

Effective: Fri July 18, 2025, 8:14 AM
Expires: Fri July 18, 2025, 8:00 PM

* WHAT...Dangerous rip currents. * WHERE...Coastal Palm Beach County, Coastal Broward County and Coastal Miami Dade County. * WHEN...Until 8 PM EDT this evening. * IMPACTS...Rip currents can sweep even the best swimmers away from shore into deeper water.

Swim near a lifeguard. If caught in a rip current, relax and float. Don't swim against the current. If able, swim in a direction following the shoreline. If unable to escape, face the shore and call or wave for help.


Heat Advisory issued July 18 at 3:04AM EDT until July 18 at 6:00PM EDT by NWS Miami FL

Effective: Fri July 18, 2025, 3:04 AM
Expires: Fri July 18, 2025, 6:00 PM

* WHAT...Heat index values of 105-111 expected. * WHERE...Portions of southeast, southern, and southwest Florida. * WHEN...From 11 AM this morning to 6 PM EDT this evening. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses.

Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1.


Rip Current Statement issued July 18 at 8:14AM EDT until July 18 at 8:00PM EDT by NWS Miami FL

Effective: Fri July 18, 2025, 8:14 AM
Expires: Fri July 18, 2025, 8:00 PM

* WHAT...Dangerous rip currents. * WHERE...Coastal Palm Beach County, Coastal Broward County and Coastal Miami Dade County. * WHEN...Until 8 PM EDT this evening. * IMPACTS...Rip currents can sweep even the best swimmers away from shore into deeper water.

Swim near a lifeguard. If caught in a rip current, relax and float. Don't swim against the current. If able, swim in a direction following the shoreline. If unable to escape, face the shore and call or wave for help.
Friday, July 18, 2025

Weather Forecast

Conditions: Sunny
Average Temperature: 85°F
Average Humidity: 82%
Chance of Rain: 0%
Wind: 19.7 mph
UV Index: 2.7

Air Quality

AQI: 2 - Moderate
PM2.5: 16.86 μg/m3
PM10: 43.7 μg/m3
Carbon Monoxide: 187.66 μg/m3
Nitrogen Dioxide: 1.1 μg/m3
Sulphur Dioxide: 0.44 μg/m3
Ozone: 37.4 μg/m3

Astronomical

Sunrise: 6:43 AM
Sun Transit: 1:28 PM
Sunset: 8:14 PM
Daylight: 13 hrs 31 mins
Moonrise: 12:51 AM
Moon Transit: 7:30 AM
Moonset: 2:17 PM
Moon Phase: Last Quarter
Moon Illumination: 33.4%

Best Times for Fishing or Hunting

Major Periods

7:00 AM - 9:30 AM
8:45 PM - 11:15 PM

Minor Periods

1:47 PM - 3:17 PM
12:21 AM - 1:51 AM

Action Rating: 3 out of 5

Saturday, July 19, 2025

Weather Forecast

Conditions: Partly Cloudy
Average Temperature: 83°F
Average Humidity: 85%
Chance of Rain: 0%
Wind: 18.6 mph
UV Index: 3

Air Quality

AQI: 2 - Moderate
PM2.5: 22.78 μg/m3
PM10: 64.06 μg/m3
Carbon Monoxide: 187.81 μg/m3
Nitrogen Dioxide: 1.48 μg/m3
Sulphur Dioxide: 0.71 μg/m3
Ozone: 45.2 μg/m3

Astronomical

Sunrise: 6:43 AM
Sun Transit: 1:28 PM
Sunset: 8:13 PM
Daylight: 13 hrs 30 mins
Moonrise: 1:31 AM
Moon Transit: 8:23 AM
Moonset: 3:24 PM
Moon Phase: Last Quarter
Moon Illumination: 23.2%

Best Times for Fishing or Hunting

Major Periods

7:53 AM - 10:23 AM
12:00 AM - 12:00 AM

Minor Periods

2:54 PM - 4:24 PM
1:01 AM - 2:31 AM

Action Rating: 2 out of 5

Sunday, July 20, 2025

Weather Forecast

Conditions: Sunny
Average Temperature: 83°F
Average Humidity: 81%
Chance of Rain: 0%
Wind: 16.1 mph
UV Index: 2.7

Air Quality

AQI: 1 - Good
PM2.5: 9.66 μg/m3
PM10: 16.92 μg/m3
Carbon Monoxide: 179.45 μg/m3
Nitrogen Dioxide: 1.72 μg/m3
Sulphur Dioxide: 0.61 μg/m3
Ozone: 51.48 μg/m3

Astronomical

Sunrise: 6:44 AM
Sun Transit: 1:28 PM
Sunset: 8:13 PM
Daylight: 13 hrs 29 mins
Moonrise: 2:17 AM
Moon Transit: 9:21 AM
Moonset: 4:33 PM
Moon Phase: Waning Crescent
Moon Illumination: 14.4%

Best Times for Fishing or Hunting

Major Periods

8:51 AM - 11:21 AM
12:00 AM - 12:00 AM

Minor Periods

4:03 PM - 5:33 PM
1:47 AM - 3:17 AM

Action Rating: 2 out of 5

Monday, July 21, 2025

Weather Forecast

Conditions: Sunny
Average Temperature: 83°F
Average Humidity: 81%
Chance of Rain: 0%
Wind: 12.5 mph
UV Index: 2.9

Air Quality

AQI: 1 - Good
PM2.5: 6.06 μg/m3
PM10: 9.13 μg/m3
Carbon Monoxide: 180.56 μg/m3
Nitrogen Dioxide: 1.68 μg/m3
Sulphur Dioxide: 0.7 μg/m3
Ozone: 54.12 μg/m3

Astronomical

Sunrise: 6:44 AM
Sun Transit: 1:28 PM
Sunset: 8:13 PM
Daylight: 13 hrs 28 mins
Moonrise: 3:10 AM
Moon Transit: 10:23 AM
Moonset: 5:40 PM
Moon Phase: Waning Crescent
Moon Illumination: 7.4%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
9:53 AM - 12:23 AM

Minor Periods

5:10 PM - 6:40 PM
2:40 AM - 4:10 AM

Action Rating: 2 out of 5

Tuesday, July 22, 2025

Weather Forecast

Conditions: Patchy rain nearby
Average Temperature: 82.8°F
Average Humidity: 71%
Chance of Rain: 88%
Wind: 10.1 mph
UV Index: 2.7

Air Quality

AQI: 1 - Good
PM2.5: 5.19 μg/m3
PM10: 7.88 μg/m3
Carbon Monoxide: 180.73 μg/m3
Nitrogen Dioxide: 1.81 μg/m3
Sulphur Dioxide: 0.64 μg/m3
Ozone: 48.69 μg/m3

Astronomical

Sunrise: 6:45 AM
Sun Transit: 1:28 PM
Sunset: 8:12 PM
Daylight: 13 hrs 27 mins
Moonrise: 4:10 AM
Moon Transit: 11:27 AM
Moonset: 6:44 PM
Moon Phase: Waning Crescent
Moon Illumination: 2.6%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
10:57 AM - 1:27 PM

Minor Periods

6:14 PM - 7:44 PM
3:40 AM - 5:10 AM

Action Rating: 3 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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