Water Temperature of the Gulf of Mexico in Marathon, FL

Current Water Temperature

89.2°F

Measurement Time: Wednesday, July 22, 2026, 12:18 PM EDT

Today's Tides

Low: July 22, 12:33 AM, 0.4 ft
 High: July 22, 7:25 AM, 1.0 ft
Low: July 22, 2:31 PM, 0.0 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

88°F
Sunny
Sunny
100.6°F
97.3°F
66%
SE 13.4 mph
17.9 mph
86.7°F
76.5°F
0 in
25%
9 mi
1016 mbar
10.1

Five Day Weather Forecast

Sunny
Wed
H: 88°F
L: 84°F
Patchy rain nearby
Thu
H: 86°F
L: 85°F
Patchy rain nearby
Fri
H: 86°F
L: 85°F
Partly Cloudy
Sat
H: 86°F
L: 85°F
Sunny
Sun
H: 85°F
L: 84°F

Air Quality

AQI: 1 - Good
PM2.5: 8.8 μg/m3
PM10: 15.2 μg/m3
Carbon Monoxide: 87 μg/m3
Nitrogen Dioxide: 0.3 μg/m3
Sulphur Dioxide: 0.3 μg/m3
Ozone: 49 μg/m3

Astronomical

Sunrise: 6:48 AM
Sun Transit: 1:30 PM
Sunset: 8:14 PM
Daylight: 13 hrs 26 mins
Moonrise: 2:47 PM
Moon Transit: 8:15 PM
Moonset: 1:03 AM
Moon Phase: First Quarter
Moon Illumination: 55.0%

Best Times for Fishing or Hunting

Major Periods

8:35 AM - 11:05 AM
7:45 PM - 10:15 PM

Minor Periods

2:17 PM - 3:47 PM
12:33 AM - 2:03 AM

Action Rating: 3 out of 5

Wednesday, July 22, 2026

Weather Forecast

Sunny
88.2°F
83.8°F
85.7°F
70%
0 in
6%
0%
17.7 mph
11.6


Air Quality

AQI: 1 - Good
PM2.5: 8.96 μg/m3
PM10: 15.46 μg/m3
Carbon Monoxide: 86.83 μg/m3
Nitrogen Dioxide: 0.39 μg/m3
Sulphur Dioxide: 0.31 μg/m3
Ozone: 46.54 μg/m3

Astronomical

Sunrise: 6:48 AM
Sun Transit: 1:30 PM
Sunset: 8:14 PM
Daylight: 13 hrs 26 mins
Moonrise: 2:47 PM
Moon Transit: 8:15 PM
Moonset: 1:03 AM
Moon Phase: First Quarter
Moon Illumination: 55.0%

Best Times for Fishing or Hunting

Major Periods

8:35 AM - 11:05 AM
7:45 PM - 10:15 PM

Minor Periods

2:17 PM - 3:47 PM
12:33 AM - 2:03 AM

Action Rating: 3 out of 5

Thursday, July 23, 2026

Weather Forecast

Patchy rain nearby
86.3°F
84.6°F
85.3°F
71%
0.04 in
57%
0%
21.3 mph
11.8


Air Quality

AQI: 1 - Good
PM2.5: 5.47 μg/m3
PM10: 8.74 μg/m3
Carbon Monoxide: 86.29 μg/m3
Nitrogen Dioxide: 0.52 μg/m3
Sulphur Dioxide: 0.36 μg/m3
Ozone: 53.58 μg/m3

Astronomical

Sunrise: 6:49 AM
Sun Transit: 1:30 PM
Sunset: 8:13 PM
Daylight: 13 hrs 25 mins
Moonrise: 3:42 PM
Moon Transit: 9:03 PM
Moonset: 1:41 AM
Moon Phase: First Quarter
Moon Illumination: 66.1%

Best Times for Fishing or Hunting

Major Periods

9:22 AM - 11:52 AM
8:33 PM - 11:03 PM

Minor Periods

3:12 PM - 4:42 PM
1:11 AM - 2:41 AM

Action Rating: 3 out of 5

Friday, July 24, 2026

Weather Forecast

Patchy rain nearby
85.9°F
84.5°F
85.2°F
73%
0.15 in
66%
0%
19.7 mph
11.7


Air Quality

AQI: 1 - Good
PM2.5: 3.57 μg/m3
PM10: 5.03 μg/m3
Carbon Monoxide: 90.04 μg/m3
Nitrogen Dioxide: 0.85 μg/m3
Sulphur Dioxide: 0.35 μg/m3
Ozone: 60.42 μg/m3

Astronomical

Sunrise: 6:49 AM
Sun Transit: 1:31 PM
Sunset: 8:13 PM
Daylight: 13 hrs 24 mins
Moonrise: 4:38 PM
Moon Transit: 9:53 PM
Moonset: 2:22 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 76.3%

Best Times for Fishing or Hunting

Major Periods

10:11 AM - 12:41 AM
9:23 PM - 11:53 PM

Minor Periods

4:08 PM - 5:38 PM
1:52 AM - 3:22 AM

Action Rating: 2 out of 5

Saturday, July 25, 2026

Weather Forecast

Partly Cloudy
85.7°F
84.5°F
85.2°F
73%
0.36 in
73%
0%
17.9 mph
7


Air Quality

AQI: 1 - Good
PM2.5: 5.73 μg/m3
PM10: 7.82 μg/m3
Carbon Monoxide: 100.16 μg/m3
Nitrogen Dioxide: 0.53 μg/m3
Sulphur Dioxide: 0.78 μg/m3
Ozone: 70.96 μg/m3

Astronomical

Sunrise: 6:50 AM
Sun Transit: 1:31 PM
Sunset: 8:13 PM
Daylight: 13 hrs 23 mins
Moonrise: 5:31 PM
Moon Transit: 10:44 PM
Moonset: 3:08 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 85.2%

Best Times for Fishing or Hunting

Major Periods

11:02 AM - 1:32 PM
12:00 AM - 12:00 AM

Minor Periods

5:01 PM - 6:31 PM
2:38 AM - 4:08 AM

Action Rating: 2 out of 5

Sunday, July 26, 2026

Weather Forecast

Sunny
85.3°F
83.9°F
84.6°F
72%
0.13 in
60%
0%
11.4 mph
7


Air Quality

AQI: 1 - Good
PM2.5: 7.9 μg/m3
PM10: 10.79 μg/m3
Carbon Monoxide: 163.89 μg/m3
Nitrogen Dioxide: 0.26 μg/m3
Sulphur Dioxide: 1.97 μg/m3
Ozone: 80.78 μg/m3

Astronomical

Sunrise: 6:50 AM
Sun Transit: 1:31 PM
Sunset: 8:12 PM
Daylight: 13 hrs 22 mins
Moonrise: 6:22 PM
Moon Transit: 11:36 PM
Moonset: 3:58 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 92.3%

Best Times for Fishing or Hunting

Major Periods

11:54 AM - 2:24 PM
12:00 AM - 12:00 AM

Minor Periods

5:52 PM - 7:22 PM
3:28 AM - 4:58 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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