Water Temperature of the Gulf of Mexico in Marathon, FL

Current Water Temperature

87.8°F

Measurement Time: Monday, September 21, 2026, 1:24 AM EDT

Today's Tides

 High: September 21, 8:50 AM, 1.2 ft
Low: September 21, 3:48 PM, 0.4 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

82°F
Showers And Thunderstorms Likely
Showers And Thunderstorms Likely
82%
SE 5 mph
76°F

Weather Forecast

Showers And Thunderstorms Likely
Overnight
80°F - Showers And Thunderstorms Likely
Showers And Thunderstorms Likely
Monday
87°F - Showers And Thunderstorms Likely
Showers And Thunderstorms Likely
Monday Night
81°F - Showers And Thunderstorms Likely
Showers And Thunderstorms Likely
Tuesday
88°F - Showers And Thunderstorms Likely
Showers And Thunderstorms Likely
Tuesday Night
80°F - Showers And Thunderstorms Likely
Showers And Thunderstorms
Wednesday
87°F - Showers And Thunderstorms
Showers And Thunderstorms
Wednesday Night
80°F - Showers And Thunderstorms
Showers And Thunderstorms Likely
Thursday
87°F - Showers And Thunderstorms Likely
Showers And Thunderstorms Likely then Chance Showers And Thunderstorms
Thursday Night
81°F - Showers And Thunderstorms Likely then Chance Showers And Thunderstorms
Chance Showers And Thunderstorms
Friday
88°F - Chance Showers And Thunderstorms
Chance Showers And Thunderstorms
Friday Night
81°F - Chance Showers And Thunderstorms
Chance Showers And Thunderstorms then Showers And Thunderstorms Likely
Saturday
87°F - Chance Showers And Thunderstorms then Showers And Thunderstorms Likely
Showers And Thunderstorms Likely
Saturday Night
80°F - Showers And Thunderstorms Likely
Showers And Thunderstorms Likely
Sunday
86°F - Showers And Thunderstorms Likely

Astronomical

Sunrise: 7:13 AM
Sun Transit: 1:17 PM
Sunset: 7:21 PM
Daylight: 12 hrs 9 mins
Moonrise: 4:23 PM
Moon Transit: 9:49 PM
Moonset: 2:24 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 75.7%

Best Times for Fishing or Hunting

Major Periods

10:09 AM - 12:39 AM
9:19 PM - 11:49 PM

Minor Periods

3:53 PM - 5:23 PM
1:54 AM - 3:24 AM

Action Rating: 2 out of 5

Wednesday, December 31, 1969

Weather Forecast

°F
°F
°F
%
in
%
%
mph


Air Quality

AQI: 0 -
PM2.5: 0 μg/m3
PM10: 0 μg/m3
Carbon Monoxide: 0 μg/m3
Nitrogen Dioxide: 0 μg/m3
Sulphur Dioxide: 0 μg/m3
Ozone: 0 μg/m3

Astronomical

Sunrise: 7:13 AM
Sun Transit: 1:17 PM
Sunset: 7:21 PM
Daylight: 12 hrs 9 mins
Moonrise: 4:23 PM
Moon Transit: 9:49 PM
Moonset: 2:24 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 75.7%

Best Times for Fishing or Hunting

Major Periods

10:09 AM - 12:39 AM
9:19 PM - 11:49 PM

Minor Periods

3:53 PM - 5:23 PM
1:54 AM - 3:24 AM

Action Rating: 2 out of 5

Wednesday, December 31, 1969

Weather Forecast

°F
°F
°F
%
in
%
%
mph


Air Quality

AQI: 0 -
PM2.5: 0 μg/m3
PM10: 0 μg/m3
Carbon Monoxide: 0 μg/m3
Nitrogen Dioxide: 0 μg/m3
Sulphur Dioxide: 0 μg/m3
Ozone: 0 μg/m3

Astronomical

Sunrise: 7:13 AM
Sun Transit: 1:17 PM
Sunset: 7:21 PM
Daylight: 12 hrs 9 mins
Moonrise: 4:23 PM
Moon Transit: 9:49 PM
Moonset: 2:24 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 75.7%

Best Times for Fishing or Hunting

Major Periods

10:09 AM - 12:39 AM
9:19 PM - 11:49 PM

Minor Periods

3:53 PM - 5:23 PM
1:54 AM - 3:24 AM

Action Rating: 2 out of 5

Wednesday, December 31, 1969

Weather Forecast

°F
°F
°F
%
in
%
%
mph


Air Quality

AQI: 0 -
PM2.5: 0 μg/m3
PM10: 0 μg/m3
Carbon Monoxide: 0 μg/m3
Nitrogen Dioxide: 0 μg/m3
Sulphur Dioxide: 0 μg/m3
Ozone: 0 μg/m3

Astronomical

Sunrise: 7:13 AM
Sun Transit: 1:17 PM
Sunset: 7:21 PM
Daylight: 12 hrs 9 mins
Moonrise: 4:23 PM
Moon Transit: 9:49 PM
Moonset: 2:24 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 75.7%

Best Times for Fishing or Hunting

Major Periods

10:09 AM - 12:39 AM
9:19 PM - 11:49 PM

Minor Periods

3:53 PM - 5:23 PM
1:54 AM - 3:24 AM

Action Rating: 2 out of 5

Wednesday, December 31, 1969

Weather Forecast

°F
°F
°F
%
in
%
%
mph


Air Quality

AQI: 0 -
PM2.5: 0 μg/m3
PM10: 0 μg/m3
Carbon Monoxide: 0 μg/m3
Nitrogen Dioxide: 0 μg/m3
Sulphur Dioxide: 0 μg/m3
Ozone: 0 μg/m3

Astronomical

Sunrise: 7:13 AM
Sun Transit: 1:17 PM
Sunset: 7:20 PM
Daylight: 12 hrs 8 mins
Moonrise: 5:00 PM
Moon Transit: 10:35 PM
Moonset: 3:20 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 84.7%

Best Times for Fishing or Hunting

Major Periods

10:56 AM - 1:26 PM
12:00 AM - 12:00 AM

Minor Periods

4:30 PM - 6:00 PM
2:50 AM - 4:20 AM

Action Rating: 2 out of 5

Wednesday, December 31, 1969

Weather Forecast

°F
°F
°F
%
in
%
%
mph


Air Quality

AQI: 0 -
PM2.5: 0 μg/m3
PM10: 0 μg/m3
Carbon Monoxide: 0 μg/m3
Nitrogen Dioxide: 0 μg/m3
Sulphur Dioxide: 0 μg/m3
Ozone: 0 μg/m3

Astronomical

Sunrise: 7:13 AM
Sun Transit: 1:17 PM
Sunset: 7:20 PM
Daylight: 12 hrs 8 mins
Moonrise: 5:00 PM
Moon Transit: 10:35 PM
Moonset: 3:20 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 84.7%

Best Times for Fishing or Hunting

Major Periods

10:56 AM - 1:26 PM
12:00 AM - 12:00 AM

Minor Periods

4:30 PM - 6:00 PM
2:50 AM - 4:20 AM

Action Rating: 2 out of 5

Wednesday, December 31, 1969

Weather Forecast

°F
°F
°F
%
in
%
%
mph


Air Quality

AQI: 0 -
PM2.5: 0 μg/m3
PM10: 0 μg/m3
Carbon Monoxide: 0 μg/m3
Nitrogen Dioxide: 0 μg/m3
Sulphur Dioxide: 0 μg/m3
Ozone: 0 μg/m3

Astronomical

Sunrise: 7:13 AM
Sun Transit: 1:16 PM
Sunset: 7:19 PM
Daylight: 12 hrs 6 mins
Moonrise: 5:35 PM
Moon Transit: 11:20 PM
Moonset: 4:16 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 91.9%

Best Times for Fishing or Hunting

Major Periods

11:41 AM - 2:11 PM
12:00 AM - 12:00 AM

Minor Periods

5:05 PM - 6:35 PM
3:46 AM - 5:16 AM

Action Rating: 2 out of 5

Wednesday, December 31, 1969

Weather Forecast

°F
°F
°F
%
in
%
%
mph


Air Quality

AQI: 0 -
PM2.5: 0 μg/m3
PM10: 0 μg/m3
Carbon Monoxide: 0 μg/m3
Nitrogen Dioxide: 0 μg/m3
Sulphur Dioxide: 0 μg/m3
Ozone: 0 μg/m3

Astronomical

Sunrise: 7:13 AM
Sun Transit: 1:16 PM
Sunset: 7:19 PM
Daylight: 12 hrs 6 mins
Moonrise: 5:35 PM
Moon Transit: 11:20 PM
Moonset: 4:16 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 91.9%

Best Times for Fishing or Hunting

Major Periods

11:41 AM - 2:11 PM
12:00 AM - 12:00 AM

Minor Periods

5:05 PM - 6:35 PM
3:46 AM - 5:16 AM

Action Rating: 2 out of 5

Wednesday, December 31, 1969

Weather Forecast

°F
°F
°F
%
in
%
%
mph


Air Quality

AQI: 0 -
PM2.5: 0 μg/m3
PM10: 0 μg/m3
Carbon Monoxide: 0 μg/m3
Nitrogen Dioxide: 0 μg/m3
Sulphur Dioxide: 0 μg/m3
Ozone: 0 μg/m3

Astronomical

Sunrise: 7:14 AM
Sun Transit: 1:16 PM
Sunset: 7:18 PM
Daylight: 12 hrs 5 mins
Moonrise: 6:08 PM
Moon Transit: 12:00 AM
Moonset: 5:11 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 97.0%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
12:25 AM - 2:55 PM

Minor Periods

5:38 PM - 7:08 PM
4:41 AM - 6:11 AM

Action Rating: 3 out of 5

Wednesday, December 31, 1969

Weather Forecast

°F
°F
°F
%
in
%
%
mph


Air Quality

AQI: 0 -
PM2.5: 0 μg/m3
PM10: 0 μg/m3
Carbon Monoxide: 0 μg/m3
Nitrogen Dioxide: 0 μg/m3
Sulphur Dioxide: 0 μg/m3
Ozone: 0 μg/m3

Astronomical

Sunrise: 7:14 AM
Sun Transit: 1:16 PM
Sunset: 7:18 PM
Daylight: 12 hrs 5 mins
Moonrise: 6:08 PM
Moon Transit: 12:00 AM
Moonset: 5:11 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 97.0%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
12:25 AM - 2:55 PM

Minor Periods

5:38 PM - 7:08 PM
4:41 AM - 6:11 AM

Action Rating: 3 out of 5

Wednesday, December 31, 1969

Weather Forecast

°F
°F
°F
%
in
%
%
mph


Air Quality

AQI: 0 -
PM2.5: 0 μg/m3
PM10: 0 μg/m3
Carbon Monoxide: 0 μg/m3
Nitrogen Dioxide: 0 μg/m3
Sulphur Dioxide: 0 μg/m3
Ozone: 0 μg/m3

Astronomical

Sunrise: 7:14 AM
Sun Transit: 1:16 PM
Sunset: 7:17 PM
Daylight: 12 hrs 3 mins
Moonrise: 6:40 PM
Moon Transit: 12:04 AM
Moonset: 6:08 AM
Moon Phase: Full
Moon Illumination: 99.6%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
1:10 PM - 3:40 PM

Minor Periods

6:10 PM - 7:40 PM
5:38 AM - 7:08 AM

Action Rating: 5 out of 5

Wednesday, December 31, 1969

Weather Forecast

°F
°F
°F
%
in
%
%
mph


Air Quality

AQI: 0 -
PM2.5: 0 μg/m3
PM10: 0 μg/m3
Carbon Monoxide: 0 μg/m3
Nitrogen Dioxide: 0 μg/m3
Sulphur Dioxide: 0 μg/m3
Ozone: 0 μg/m3

Astronomical

Sunrise: 7:14 AM
Sun Transit: 1:16 PM
Sunset: 7:17 PM
Daylight: 12 hrs 3 mins
Moonrise: 6:40 PM
Moon Transit: 12:04 AM
Moonset: 6:08 AM
Moon Phase: Full
Moon Illumination: 99.6%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
1:10 PM - 3:40 PM

Minor Periods

6:10 PM - 7:40 PM
5:38 AM - 7:08 AM

Action Rating: 5 out of 5

Wednesday, December 31, 1969

Weather Forecast

°F
°F
°F
%
in
%
%
mph


Air Quality

AQI: 0 -
PM2.5: 0 μg/m3
PM10: 0 μg/m3
Carbon Monoxide: 0 μg/m3
Nitrogen Dioxide: 0 μg/m3
Sulphur Dioxide: 0 μg/m3
Ozone: 0 μg/m3

Astronomical

Sunrise: 7:14 AM
Sun Transit: 1:15 PM
Sunset: 7:16 PM
Daylight: 12 hrs 2 mins
Moonrise: 7:13 PM
Moon Transit: 12:49 AM
Moonset: 7:04 AM
Moon Phase: Full
Moon Illumination: 99.7%

Best Times for Fishing or Hunting

Major Periods

12:19 AM - 2:49 AM
8:03 AM - 10:33 AM

Minor Periods

6:43 PM - 8:13 PM
6:34 AM - 8:04 AM

Action Rating: 3 out of 5

Wednesday, December 31, 1969

Weather Forecast

°F
°F
°F
%
in
%
%
mph


Air Quality

AQI: 0 -
PM2.5: 0 μg/m3
PM10: 0 μg/m3
Carbon Monoxide: 0 μg/m3
Nitrogen Dioxide: 0 μg/m3
Sulphur Dioxide: 0 μg/m3
Ozone: 0 μg/m3

Astronomical

Sunrise: 7:14 AM
Sun Transit: 1:15 PM
Sunset: 7:16 PM
Daylight: 12 hrs 2 mins
Moonrise: 7:13 PM
Moon Transit: 12:49 AM
Moonset: 7:04 AM
Moon Phase: Full
Moon Illumination: 99.7%

Best Times for Fishing or Hunting

Major Periods

12:19 AM - 2:49 AM
8:03 AM - 10:33 AM

Minor Periods

6:43 PM - 8:13 PM
6:34 AM - 8:04 AM

Action Rating: 3 out of 5

Wednesday, December 31, 1969

Weather Forecast

°F
°F
°F
%
in
%
%
mph


Air Quality

AQI: 0 -
PM2.5: 0 μg/m3
PM10: 0 μg/m3
Carbon Monoxide: 0 μg/m3
Nitrogen Dioxide: 0 μg/m3
Sulphur Dioxide: 0 μg/m3
Ozone: 0 μg/m3

Astronomical

Sunrise: 7:15 AM
Sun Transit: 1:15 PM
Sunset: 7:15 PM
Daylight: 12 hrs mins
Moonrise: 7:48 PM
Moon Transit: 12:00 AM
Moonset: 8:03 AM
Moon Phase: Full
Moon Illumination: 97.3%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
2:42 PM - 5:12 PM

Minor Periods

7:18 PM - 8:48 PM
7:33 AM - 9:03 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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