Water Temperature of the Gulf of Mexico in Marathon, FL

Current Water Temperature

90.5°F

Measurement Time: Thursday, July 2, 2026, 11:06 AM EDT

Today's Tides

 High: July 2, 3:15 PM, 1.0 ft
Low: July 2, 9:18 PM, -0.1 ft

Temperature Locations

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Local Points of Interest

Marathon Key; Vaca Key; Boot Key; Florida Keys

Gulf of Mexico

Station Name: Vaca Key, Florida Bay
Data Source: NOAA Tides and Currents

Elevation Above Sea Level: 20 feet

Sensor Depth: -3 feet

Nearest Address:
Palm Island Ave
Marathon, FL 33050
Monroe County

GPS Coordinates: 24.711000, -81.106500

Nearby Water Temperatures

Florida Bay, Islamorada, FL (25.7 mi)
Florida Bay, Islamorada, FL (26.7 mi)
Joe Kemp Channel, Flamingo, FL (29.2 mi)
East Side Creek, Flamingo, FL (29.5 mi)
Gulf of Mexico, Flamingo, FL (33 mi)
Whipray Basin, Islamorada, FL (34.1 mi)
Florida Bay, Islamorada, FL (34.5 mi)
Whitewater Bay, Flamingo, FL (37.5 mi)
Seven Palm Lake, Flamingo, FL (40 mi)
Little Madeira Bay, Homestead, FL (43.7 mi)
Taylor River, Homestead, FL (44.2 mi)
Shark River, Flamingo, FL (44.3 mi)
Florida Bay, Key Largo, FL (45.1 mi)
Taylor River, Homestead, FL (45.2 mi)
Gulf of Mexico, Key West, FL (45.4 mi)

Weather for Marathon, Florida

Current Weather

86.2°F
Partly Cloudy
Partly Cloudy
98.4°F
95.1°F
72%
S 4.9 mph
6.6 mph
84.9°F
77°F
0 in
0%
9 mi
1016 mbar
7.2

Five Day Weather Forecast

Sunny
Thu
H: 87°F
L: 80°F
Patchy rain nearby
Fri
H: 86°F
L: 84°F
Patchy rain nearby
Sat
H: 86°F
L: 84°F
Patchy rain nearby
Sun
H: 86°F
L: 85°F
Patchy rain nearby
Mon
H: 86°F
L: 85°F

Air Quality

AQI: 1 - Good
PM2.5: 6.1 μg/m3
PM10: 10.3 μg/m3
Carbon Monoxide: 97 μg/m3
Nitrogen Dioxide: 0.4 μg/m3
Sulphur Dioxide: 0.4 μg/m3
Ozone: 68 μg/m3

Astronomical

Sunrise: 6:40 AM
Sun Transit: 1:28 PM
Sunset: 8:18 PM
Daylight: 13 hrs 38 mins
Moonrise: 10:28 PM
Moon Transit: 3:18 AM
Moonset: 8:50 AM
Moon Phase: Waning Gibbous
Moon Illumination: 88.5%

Best Times for Fishing or Hunting

Major Periods

2:48 AM - 5:18 AM
4:24 PM - 6:54 PM

Minor Periods

9:58 PM - 11:28 PM
8:20 AM - 9:50 AM

Action Rating: 2 out of 5

Special Marine Warning issued July 2 at 7:59AM EDT until July 2 at 8:30AM EDT by NWS Key West FL

Effective: Thu July 2, 2026, 7:59 AM
Expires: Thu July 2, 2026, 8:30 AM

SMWKEY The National Weather Service in Key West has issued a * Special Marine Warning for... Gulf Waters from East Cape Sable to Chokoloskee 20 to 60 nm out and beyond 5 fathoms... * Until 830 AM EDT. * At 759 AM EDT, a strong thunderstorm was located 15 nm south of D Tower, moving west at 5 knots. HAZARD...Wind gusts 34 knots or greater. SOURCE...National Weather Service Meteorologist. IMPACT...Expect wind gusts in excess of 34 knots, suddenly higher waves, frequent lightning, and heavy downpours. * The strong thunderstorm will remain over mainly open waters.

Prepare for wind gusts in excess of 34 knots, steep and fast-building seas, frequent lightning, and blinding downpours. Stay low or go below, and make sure all on board are wearing life jackets.
Thursday, July 2, 2026

Weather Forecast

Sunny
86.5°F
80.4°F
84.5°F
76%
0.64 in
72%
0%
9.8 mph
11.3


Air Quality

AQI: 1 - Good
PM2.5: 6.07 μg/m3
PM10: 10 μg/m3
Carbon Monoxide: 94.63 μg/m3
Nitrogen Dioxide: 0.48 μg/m3
Sulphur Dioxide: 0.42 μg/m3
Ozone: 71.5 μg/m3

Astronomical

Sunrise: 6:40 AM
Sun Transit: 1:28 PM
Sunset: 8:18 PM
Daylight: 13 hrs 38 mins
Moonrise: 10:28 PM
Moon Transit: 3:18 AM
Moonset: 8:50 AM
Moon Phase: Waning Gibbous
Moon Illumination: 88.5%

Best Times for Fishing or Hunting

Major Periods

2:48 AM - 5:18 AM
4:24 PM - 6:54 PM

Minor Periods

9:58 PM - 11:28 PM
8:20 AM - 9:50 AM

Action Rating: 2 out of 5

Friday, July 3, 2026

Weather Forecast

Patchy rain nearby
85.9°F
84.2°F
85.1°F
70%
0.05 in
57%
0%
11.4 mph
11


Air Quality

AQI: 1 - Good
PM2.5: 4.55 μg/m3
PM10: 8.32 μg/m3
Carbon Monoxide: 92.96 μg/m3
Nitrogen Dioxide: 0.45 μg/m3
Sulphur Dioxide: 0.41 μg/m3
Ozone: 50.54 μg/m3

Astronomical

Sunrise: 6:40 AM
Sun Transit: 1:28 PM
Sunset: 8:18 PM
Daylight: 13 hrs 38 mins
Moonrise: 11:01 PM
Moon Transit: 4:03 AM
Moonset: 9:45 AM
Moon Phase: Waning Gibbous
Moon Illumination: 80.3%

Best Times for Fishing or Hunting

Major Periods

3:33 AM - 6:03 AM
5:09 PM - 7:39 PM

Minor Periods

12:00 AM - 12:00 AM
9:15 AM - 10:45 AM

Action Rating: 2 out of 5

Saturday, July 4, 2026

Weather Forecast

Patchy rain nearby
85.7°F
84.4°F
85.2°F
70%
0.08 in
57%
0%
13.2 mph
11.6


Air Quality

AQI: 1 - Good
PM2.5: 5.6 μg/m3
PM10: 12.44 μg/m3
Carbon Monoxide: 91.83 μg/m3
Nitrogen Dioxide: 0.48 μg/m3
Sulphur Dioxide: 0.32 μg/m3
Ozone: 46.67 μg/m3

Astronomical

Sunrise: 6:40 AM
Sun Transit: 1:28 PM
Sunset: 8:18 PM
Daylight: 13 hrs 38 mins
Moonrise: 12:01 AM
Moon Transit: 4:47 AM
Moonset: 10:39 AM
Moon Phase: Waning Gibbous
Moon Illumination: 70.6%

Best Times for Fishing or Hunting

Major Periods

4:17 AM - 6:47 AM
5:52 PM - 8:22 PM

Minor Periods

10:09 AM - 11:39 AM
12:00 AM - 12:00 AM

Action Rating: 4 out of 5

Sunday, July 5, 2026

Weather Forecast

Patchy rain nearby
85.8°F
85°F
85.3°F
68%
0.01 in
20%
0%
16.6 mph
11.2


Air Quality

AQI: 1 - Good
PM2.5: 6.62 μg/m3
PM10: 12.65 μg/m3
Carbon Monoxide: 90.48 μg/m3
Nitrogen Dioxide: 0.47 μg/m3
Sulphur Dioxide: 0.26 μg/m3
Ozone: 42.38 μg/m3

Astronomical

Sunrise: 6:41 AM
Sun Transit: 1:29 PM
Sunset: 8:18 PM
Daylight: 13 hrs 37 mins
Moonrise: 12:33 AM
Moon Transit: 5:30 AM
Moonset: 11:33 AM
Moon Phase: Waning Gibbous
Moon Illumination: 59.8%

Best Times for Fishing or Hunting

Major Periods

5:00 AM - 7:30 AM
12:00 AM - 12:00 AM

Minor Periods

11:03 AM - 12:33 AM
12:00 AM - 12:00 AM

Action Rating: 2 out of 5

Monday, July 6, 2026

Weather Forecast

Patchy rain nearby
85.6°F
84.5°F
85.3°F
69%
0.03 in
39%
0%
16.8 mph
7


Air Quality

AQI: 1 - Good
PM2.5: 8.5 μg/m3
PM10: 15.78 μg/m3
Carbon Monoxide: 86.56 μg/m3
Nitrogen Dioxide: 0.56 μg/m3
Sulphur Dioxide: 0.24 μg/m3
Ozone: 37.89 μg/m3

Astronomical

Sunrise: 6:41 AM
Sun Transit: 1:29 PM
Sunset: 8:18 PM
Daylight: 13 hrs 37 mins
Moonrise: 12:04 AM
Moon Transit: 1:15 PM
Moonset: 12:29 AM
Moon Phase: Last Quarter
Moon Illumination: 48.6%

Best Times for Fishing or Hunting

Major Periods

12:45 AM - 3:15 PM
12:45 AM - 3:15 PM

Minor Periods

11:59 AM - 1:29 PM
12:00 AM - 12:00 AM

Action Rating: 2 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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