Water Temperature of the Gulf of Mexico in Marathon, FL

Current Water Temperature

76.1°F

Measurement Time: Monday, March 23, 2026, 11:06 PM EDT

Today's Tides

 High: March 23, 4:52 PM, 0.8 ft
Low: March 23, 11:19 PM, -0.6 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

72°F
Clear
Clear
76.3°F
75.8°F
73%
NNW 6.9 mph
9.5 mph
70.4°F
64.2°F
0 in
0%
9 mi
1019 mbar
0

Five Day Weather Forecast

Sunny
Mon
H: 75°F
L: 69°F
Sunny
Tue
H: 72°F
L: 68°F
Partly Cloudy
Wed
H: 72°F
L: 66°F
Overcast
Thu
H: 73°F
L: 69°F
Patchy rain nearby
Fri
H: 75°F
L: 72°F

Air Quality

AQI: 1 - Good
PM2.5: 9.05 μg/m3
PM10: 12.75 μg/m3
Carbon Monoxide: 139.85 μg/m3
Nitrogen Dioxide: 1.25 μg/m3
Sulphur Dioxide: 1.45 μg/m3
Ozone: 108 μg/m3

Astronomical

Sunrise: 7:25 AM
Sun Transit: 12:00 AM
Sunset: 7:37 PM
Daylight: 12 hrs 12 mins
Moonrise: 10:32 AM
Moon Transit: 5:40 PM
Moonset: 12:44 AM
Moon Phase: Waxing Crescent
Moon Illumination: 23.8%

Best Times for Fishing or Hunting

Major Periods

5:53 AM - 8:23 AM
5:10 PM - 7:40 PM

Minor Periods

10:02 AM - 11:32 AM
12:00 AM - 12:00 AM

Action Rating: 3 out of 5

Monday, March 23, 2026

Weather Forecast

Sunny
74.5°F
69.4°F
71.6°F
76%
0 in
0%
0%
7.8 mph
2.3


Air Quality

AQI: 1 - Good
PM2.5: 7.51 μg/m3
PM10: 10.58 μg/m3
Carbon Monoxide: 132.33 μg/m3
Nitrogen Dioxide: 1.39 μg/m3
Sulphur Dioxide: 1.4 μg/m3
Ozone: 108.68 μg/m3

Astronomical

Sunrise: 7:25 AM
Sun Transit: 12:00 AM
Sunset: 7:37 PM
Daylight: 12 hrs 12 mins
Moonrise: 10:32 AM
Moon Transit: 5:40 PM
Moonset: 12:44 AM
Moon Phase: Waxing Crescent
Moon Illumination: 23.8%

Best Times for Fishing or Hunting

Major Periods

5:53 AM - 8:23 AM
5:10 PM - 7:40 PM

Minor Periods

10:02 AM - 11:32 AM
12:00 AM - 12:00 AM

Action Rating: 3 out of 5

Tuesday, March 24, 2026

Weather Forecast

Sunny
71.8°F
68.4°F
69.8°F
80%
0 in
0%
0%
9.2 mph
2.3


Air Quality

AQI: 1 - Good
PM2.5: 7.86 μg/m3
PM10: 10.89 μg/m3
Carbon Monoxide: 143.69 μg/m3
Nitrogen Dioxide: 1.7 μg/m3
Sulphur Dioxide: 1.55 μg/m3
Ozone: 107.92 μg/m3

Astronomical

Sunrise: 7:24 AM
Sun Transit: 12:00 AM
Sunset: 7:37 PM
Daylight: 12 hrs 13 mins
Moonrise: 11:28 AM
Moon Transit: 6:42 PM
Moonset: 12:53 AM
Moon Phase: Waxing Crescent
Moon Illumination: 34.0%

Best Times for Fishing or Hunting

Major Periods

6:55 AM - 9:25 AM
6:12 PM - 8:42 PM

Minor Periods

10:58 AM - 12:28 AM
12:23 AM - 1:53 AM

Action Rating: 3 out of 5

Wednesday, March 25, 2026

Weather Forecast

Partly Cloudy
72.3°F
66.2°F
69.9°F
86%
0 in
0%
0%
11.6 mph
2.2


Air Quality

AQI: 1 - Good
PM2.5: 9.86 μg/m3
PM10: 13.37 μg/m3
Carbon Monoxide: 138.45 μg/m3
Nitrogen Dioxide: 1.58 μg/m3
Sulphur Dioxide: 1.68 μg/m3
Ozone: 117.96 μg/m3

Astronomical

Sunrise: 7:23 AM
Sun Transit: 12:00 AM
Sunset: 7:38 PM
Daylight: 12 hrs 15 mins
Moonrise: 12:31 AM
Moon Transit: 7:45 PM
Moonset: 1:58 AM
Moon Phase: First Quarter
Moon Illumination: 45.1%

Best Times for Fishing or Hunting

Major Periods

7:58 AM - 10:28 AM
7:15 PM - 9:45 PM

Minor Periods

12:01 AM - 1:31 PM
1:28 AM - 2:58 AM

Action Rating: 3 out of 5

Thursday, March 26, 2026

Weather Forecast

Overcast
72.9°F
68.9°F
70.9°F
81%
0 in
0%
0%
15.2 mph
2.3


Air Quality

AQI: 1 - Good
PM2.5: 9.16 μg/m3
PM10: 12.02 μg/m3
Carbon Monoxide: 146.12 μg/m3
Nitrogen Dioxide: 1.48 μg/m3
Sulphur Dioxide: 1.54 μg/m3
Ozone: 111.84 μg/m3

Astronomical

Sunrise: 7:22 AM
Sun Transit: 12:00 AM
Sunset: 7:38 PM
Daylight: 12 hrs 16 mins
Moonrise: 1:37 PM
Moon Transit: 8:45 PM
Moonset: 2:57 AM
Moon Phase: First Quarter
Moon Illumination: 56.4%

Best Times for Fishing or Hunting

Major Periods

9:00 AM - 11:30 AM
8:15 PM - 10:45 PM

Minor Periods

1:07 PM - 2:37 PM
2:27 AM - 3:57 AM

Action Rating: 2 out of 5

Friday, March 27, 2026

Weather Forecast

Patchy rain nearby
74.7°F
72.3°F
74°F
79%
0.01 in
88%
0%
15.9 mph
2.4


Air Quality

AQI: 1 - Good
PM2.5: 9.24 μg/m3
PM10: 12.86 μg/m3
Carbon Monoxide: 140.95 μg/m3
Nitrogen Dioxide: 1.6 μg/m3
Sulphur Dioxide: 1.36 μg/m3
Ozone: 102.15 μg/m3

Astronomical

Sunrise: 7:21 AM
Sun Transit: 12:00 AM
Sunset: 7:38 PM
Daylight: 12 hrs 18 mins
Moonrise: 2:43 PM
Moon Transit: 9:41 PM
Moonset: 3:49 AM
Moon Phase: First Quarter
Moon Illumination: 67.4%

Best Times for Fishing or Hunting

Major Periods

9:57 AM - 12:27 AM
9:11 PM - 11:41 PM

Minor Periods

2:13 PM - 3:43 PM
3:19 AM - 4:49 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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