Water Temperature of the Gulf of Mexico in Marathon, FL

Current Water Temperature

87.4°F

Measurement Time: Tuesday, September 23, 2025, 12:30 AM EDT

Today's Tides

High: September 23, 2:49 AM, 1.21 ft
 Low: September 23, 8:02 AM, 0.53 ft
High: September 23, 4:44 PM, 1.19 ft
 Low: September 23, 8:04 PM, 0.89 ft

Temperature Locations

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Local Points of Interest

Marathon Key; Vaca Key; Boot Key; Florida Keys

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Gulf of Mexico

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

Elevation Above Sea Level: 20 feet / 6 meters

Sensor Depth: -3.4 feet / -1.0 meters

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 (33.0 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 (40.0 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

82.9°F
Patchy light rain with thunder
Conditions: Patchy light rain with thunder
Humidity: 79%
Feels Like: 91.7°F
Wind: E 8.9 mph
Wind Gusts: 12.2 mph
Pressure: 29.96 in
Precipitation: 0 in
Cloud Cover: 25%
Visibility: 9 mi
UV Index: 0

Five Day Weather Forecast

Patchy rain nearby
Tue
H: 84°F
L: 78°F
Partly Cloudy
Wed
H: 84°F
L: 84°F
Patchy rain nearby
Thu
H: 84°F
L: 83°F
Partly Cloudy
Fri
H: 84°F
L: 82°F
Sunny
Sat
H: 84°F
L: 83°F

Air Quality

PM2.5: 5.18 μg/m3
PM10: 8.14 μg/m3
Carbon Monoxide: 183.15 μg/m3
Nitrogen Dioxide: 1.3 μg/m3
Sulphur Dioxide: 0.56 μg/m3
Ozone: 47 μg/m3

Astronomical

Sunrise: 7:13 AM
Sun Transit: 1:16 PM
Sunset: 7:19 PM
Daylight: 12 hrs 6 mins
Moonrise: 8:43 AM
Moon Transit: 2:32 PM
Moonset: 8:18 PM
Moon Phase: New
Moon Illumination: 0.6%

Best Times for Fishing or Hunting

Major Periods

2:55 AM - 5:25 AM
2:02 PM - 4:32 PM

Minor Periods

7:48 PM - 9:18 PM
8:13 AM - 9:43 AM

Action Rating: 4 out of 5

Coastal Flood Statement issued September 22 at 10:23AM EDT until September 23 at 5:00AM EDT by NWS Key West FL

Effective: Mon September 22, 2025, 10:23 AM
Expires: Mon September 22, 2025, 11:00 PM

* WHAT...Minor saltwater flooding. * WHERE...Upper Florida Keys. * WHEN...Through late tonight. * IMPACTS...Minor saltwater flooding of low elevation streets and lots is likely. Some storm drains will overflow, and some seawalls and docks will be overtopped. Boaters can expect less clearance under fixed bridges. Motorists should remember that persistent puddles around the times of high tide are almost certain to contain a mix of saltwater. Little improvement is expected, even at lower tides.

Do not drive through flooded roadways.


Coastal Flood Statement issued September 22 at 10:23AM EDT until September 23 at 5:00AM EDT by NWS Key West FL

Effective: Mon September 22, 2025, 10:23 AM
Expires: Mon September 22, 2025, 11:00 PM

* WHAT...Minor saltwater flooding. * WHERE...Upper Florida Keys. * WHEN...Through late tonight. * IMPACTS...Minor saltwater flooding of low elevation streets and lots is likely. Some storm drains will overflow, and some seawalls and docks will be overtopped. Boaters can expect less clearance under fixed bridges. Motorists should remember that persistent puddles around the times of high tide are almost certain to contain a mix of saltwater. Little improvement is expected, even at lower tides.

Do not drive through flooded roadways.


Coastal Flood Statement issued September 22 at 10:23AM EDT until September 23 at 5:00AM EDT by NWS Key West FL

Effective: Mon September 22, 2025, 10:23 AM
Expires: Mon September 22, 2025, 11:00 PM

* WHAT...Minor saltwater flooding. * WHERE...Upper Florida Keys. * WHEN...Through late tonight. * IMPACTS...Minor saltwater flooding of low elevation streets and lots is likely. Some storm drains will overflow, and some seawalls and docks will be overtopped. Boaters can expect less clearance under fixed bridges. Motorists should remember that persistent puddles around the times of high tide are almost certain to contain a mix of saltwater. Little improvement is expected, even at lower tides.

Do not drive through flooded roadways.


Coastal Flood Statement issued September 22 at 10:23AM EDT until September 23 at 5:00AM EDT by NWS Key West FL

Effective: Mon September 22, 2025, 10:23 AM
Expires: Mon September 22, 2025, 11:00 PM

* WHAT...Minor saltwater flooding. * WHERE...Upper Florida Keys. * WHEN...Through late tonight. * IMPACTS...Minor saltwater flooding of low elevation streets and lots is likely. Some storm drains will overflow, and some seawalls and docks will be overtopped. Boaters can expect less clearance under fixed bridges. Motorists should remember that persistent puddles around the times of high tide are almost certain to contain a mix of saltwater. Little improvement is expected, even at lower tides.

Do not drive through flooded roadways.


Coastal Flood Statement issued September 22 at 10:23AM EDT until September 23 at 5:00AM EDT by NWS Key West FL

Effective: Mon September 22, 2025, 10:23 AM
Expires: Mon September 22, 2025, 11:00 PM

* WHAT...Minor saltwater flooding. * WHERE...Upper Florida Keys. * WHEN...Through late tonight. * IMPACTS...Minor saltwater flooding of low elevation streets and lots is likely. Some storm drains will overflow, and some seawalls and docks will be overtopped. Boaters can expect less clearance under fixed bridges. Motorists should remember that persistent puddles around the times of high tide are almost certain to contain a mix of saltwater. Little improvement is expected, even at lower tides.

Do not drive through flooded roadways.
Tuesday, September 23, 2025

Weather Forecast

Conditions: Patchy rain nearby
Average Temperature: 81.9°F
Average Humidity: 83%
Chance of Rain: 84%
Wind: 16.1 mph
UV Index: 2.1

Air Quality

AQI: 1 - Good
PM2.5: 4.32 μg/m3
PM10: 6.5 μg/m3
Carbon Monoxide: 184.56 μg/m3
Nitrogen Dioxide: 0.87 μg/m3
Sulphur Dioxide: 0.41 μg/m3
Ozone: 51.92 μg/m3

Astronomical

Sunrise: 7:13 AM
Sun Transit: 1:16 PM
Sunset: 7:19 PM
Daylight: 12 hrs 6 mins
Moonrise: 8:43 AM
Moon Transit: 2:32 PM
Moonset: 8:18 PM
Moon Phase: New
Moon Illumination: 0.6%

Best Times for Fishing or Hunting

Major Periods

2:55 AM - 5:25 AM
2:02 PM - 4:32 PM

Minor Periods

7:48 PM - 9:18 PM
8:13 AM - 9:43 AM

Action Rating: 4 out of 5

Wednesday, September 24, 2025

Weather Forecast

Conditions: Partly Cloudy
Average Temperature: 83.8°F
Average Humidity: 85%
Chance of Rain: 0%
Wind: 18.1 mph
UV Index: 2.1

Air Quality

AQI: 1 - Good
PM2.5: 4.9 μg/m3
PM10: 7.03 μg/m3
Carbon Monoxide: 184.19 μg/m3
Nitrogen Dioxide: 2.37 μg/m3
Sulphur Dioxide: 0.87 μg/m3
Ozone: 56.92 μg/m3

Astronomical

Sunrise: 7:14 AM
Sun Transit: 1:16 PM
Sunset: 7:18 PM
Daylight: 12 hrs 4 mins
Moonrise: 9:35 AM
Moon Transit: 3:14 PM
Moonset: 8:50 PM
Moon Phase: New
Moon Illumination: 3.6%

Best Times for Fishing or Hunting

Major Periods

3:36 AM - 6:06 AM
2:44 PM - 5:14 PM

Minor Periods

8:20 PM - 9:50 PM
9:05 AM - 10:35 AM

Action Rating: 3 out of 5

Thursday, September 25, 2025

Weather Forecast

Conditions: Patchy rain nearby
Average Temperature: 83.3°F
Average Humidity: 84%
Chance of Rain: 83%
Wind: 9.6 mph
UV Index: 2.3

Air Quality

AQI: 1 - Good
PM2.5: 5.47 μg/m3
PM10: 6.93 μg/m3
Carbon Monoxide: 192.03 μg/m3
Nitrogen Dioxide: 3.32 μg/m3
Sulphur Dioxide: 1.67 μg/m3
Ozone: 68.28 μg/m3

Astronomical

Sunrise: 7:14 AM
Sun Transit: 1:15 PM
Sunset: 7:17 PM
Daylight: 12 hrs 3 mins
Moonrise: 10:29 AM
Moon Transit: 3:58 PM
Moonset: 9:25 PM
Moon Phase: Waxing Crescent
Moon Illumination: 8.9%

Best Times for Fishing or Hunting

Major Periods

4:19 AM - 6:49 AM
3:28 PM - 5:58 PM

Minor Periods

8:55 PM - 10:25 PM
9:59 AM - 11:29 AM

Action Rating: 3 out of 5

Friday, September 26, 2025

Weather Forecast

Conditions: Partly Cloudy
Average Temperature: 83.1°F
Average Humidity: 74%
Chance of Rain: 0%
Wind: 8.7 mph
UV Index: 2.1

Air Quality

AQI: 1 - Good
PM2.5: 5.38 μg/m3
PM10: 7.4 μg/m3
Carbon Monoxide: 188.84 μg/m3
Nitrogen Dioxide: 1.21 μg/m3
Sulphur Dioxide: 0.81 μg/m3
Ozone: 73.85 μg/m3

Astronomical

Sunrise: 7:14 AM
Sun Transit: 1:15 PM
Sunset: 7:16 PM
Daylight: 12 hrs 1 mins
Moonrise: 11:23 AM
Moon Transit: 4:45 PM
Moonset: 10:04 PM
Moon Phase: Waxing Crescent
Moon Illumination: 16.4%

Best Times for Fishing or Hunting

Major Periods

5:05 AM - 7:35 AM
4:15 PM - 6:45 PM

Minor Periods

9:34 PM - 11:04 PM
10:53 AM - 12:23 AM

Action Rating: 3 out of 5

Saturday, September 27, 2025

Weather Forecast

Conditions: Sunny
Average Temperature: 83.1°F
Average Humidity: 71%
Chance of Rain: 0%
Wind: 10.7 mph
UV Index: 0

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: 12:19 AM
Moon Transit: 5:34 PM
Moonset: 10:49 PM
Moon Phase: Waxing Crescent
Moon Illumination: 25.6%

Best Times for Fishing or Hunting

Major Periods

5:53 AM - 8:23 AM
5:04 PM - 7:34 PM

Minor Periods

10:19 PM - 11:49 PM
11:49 AM - 1:19 PM

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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