Water Temperature of the Caribbean Sea in St. John, VI

Current Water Temperature

86.0°F

Measurement Time: Friday, September 12, 2025, 3:00 AM AST

Temperature Locations

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Caribbean Sea

Station Name: South of St. John, VI
Station Type: Buoy
Data Source: National Data Buoy Center

Elevation Above Sea Level: 0 feet / 0 meters

Nearest Address:
St. John, VI 00830

GPS Coordinates: 18.249, -64.763

Nearby Water Temperatures

Lameshur Bay, Coral Harbour (St. John), VI (5.4 mi)
Long Bay, Charlotte Amalie (St. Thomas), VI (11.9 mi)
Christiansted Harbor, Christiansted (St. Croix), VI (34.9 mi)
Bahía de Sardinas, Culebra, PR (35.6 mi)
Limetree Bay, St. Croix, VI (38.3 mi)
Atlantic Ocean, Vieques, PR (46.0 mi)
Caribbean Sea, Esperanza, PR (47.7 mi)
Atlantic Ocean, San Juan, PR (89.0 mi)
Unnamed Creek, Fort Buchanan, PR (89.5 mi)
Unnamed Creek, Fort Buchanan, PR (89.5 mi)
San Juan Bay, San Juan, PR (89.9 mi)
Las Casas Lake, Fort Buchanan, PR (90.0 mi)
Caribbean Sea, La Parguera, PR (151.2 mi)
Bahía de Mayagüez, Mayagüez, PR (157.5 mi)
Bahía de Aguadilla, Aguadilla, PR (158.1 mi)

Weather for St. John, US Virgin Islands

Current Weather

88.3°F
Partly cloudy
Conditions: Partly cloudy
Humidity: 75%
Feels Like: 110.3°F
Wind: ESE 11.4 mph
Wind Gusts: 15.2 mph
Pressure: 29.98 in
Precipitation: 0 in
Cloud Cover: 50%
Visibility: 9 mi
UV Index: 10.2

Five Day Weather Forecast

Sunny
Fri
H: 86°F
L: 82°F
Partly Cloudy
Sat
H: 87°F
L: 82°F
Patchy rain nearby
Sun
H: 86°F
L: 83°F
Moderate rain
Mon
H: 84°F
L: 83°F
Moderate rain
Tue
H: 84°F
L: 83°F

Air Quality

AQI: 1 - Good
PM2.5: 8.33 μg/m3
PM10: 20.35 μg/m3
Carbon Monoxide: 175.75 μg/m3
Nitrogen Dioxide: 0.37 μg/m3
Sulphur Dioxide: 0.56 μg/m3
Ozone: 48 μg/m3

Astronomical

Sunrise: 6:07 AM
Sun Transit: 12:15 AM
Sunset: 6:24 PM
Daylight: 12 hrs 17 mins
Moonrise: 10:12 PM
Moon Transit: 4:05 AM
Moonset: 10:54 AM
Moon Phase: Waning Gibbous
Moon Illumination: 67.4%

Best Times for Fishing or Hunting

Major Periods

3:35 AM - 6:05 AM
7:34 PM - 10:04 PM

Minor Periods

9:42 PM - 11:12 PM
10:24 AM - 11:54 AM

Action Rating: 3 out of 5

Heat Advisory issued September 12 at 2:14AM AST until September 12 at 4:00PM AST by NWS San Juan PR

Effective: Fri September 12, 2025, 2:14 AM
Expires: Fri September 12, 2025, 4:00 PM

* WHAT...This level of heat affect most individuals sensitive to heat, especially those without effective cooling and/or adequate hydration. Impacts possible in some health system and in heat-sensitive industries. * WHERE...All urban and coastal areas, as well as the eastern interior, Vieques, Culebra in Puerto Rico, and all of the U.S. Virgin Islands. * WHEN...From 10 AM this morning to 4 PM AST this afternoon. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses.

Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning or evening. Take action when you see symptoms of heat exhaustion and heat stroke. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1.


Heat Advisory issued September 12 at 2:14AM AST until September 12 at 4:00PM AST by NWS San Juan PR

Effective: Fri September 12, 2025, 2:14 AM
Expires: Fri September 12, 2025, 4:00 PM

* WHAT...This level of heat affect most individuals sensitive to heat, especially those without effective cooling and/or adequate hydration. Impacts possible in some health system and in heat-sensitive industries. * WHERE...All urban and coastal areas, as well as the eastern interior, Vieques, Culebra in Puerto Rico, and all of the U.S. Virgin Islands. * WHEN...From 10 AM this morning to 4 PM AST this afternoon. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses.

Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning or evening. Take action when you see symptoms of heat exhaustion and heat stroke. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1.


Heat Advisory issued September 12 at 2:14AM AST until September 12 at 4:00PM AST by NWS San Juan PR

Effective: Fri September 12, 2025, 2:14 AM
Expires: Fri September 12, 2025, 4:00 PM

* WHAT...This level of heat affect most individuals sensitive to heat, especially those without effective cooling and/or adequate hydration. Impacts possible in some health system and in heat-sensitive industries. * WHERE...All urban and coastal areas, as well as the eastern interior, Vieques, Culebra in Puerto Rico, and all of the U.S. Virgin Islands. * WHEN...From 10 AM this morning to 4 PM AST this afternoon. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses.

Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning or evening. Take action when you see symptoms of heat exhaustion and heat stroke. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1.


Heat Advisory issued September 12 at 2:14AM AST until September 12 at 4:00PM AST by NWS San Juan PR

Effective: Fri September 12, 2025, 2:14 AM
Expires: Fri September 12, 2025, 4:00 PM

* WHAT...This level of heat affect most individuals sensitive to heat, especially those without effective cooling and/or adequate hydration. Impacts possible in some health system and in heat-sensitive industries. * WHERE...All urban and coastal areas, as well as the eastern interior, Vieques, Culebra in Puerto Rico, and all of the U.S. Virgin Islands. * WHEN...From 10 AM this morning to 4 PM AST this afternoon. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses.

Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning or evening. Take action when you see symptoms of heat exhaustion and heat stroke. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1.


Heat Advisory issued September 12 at 2:14AM AST until September 12 at 4:00PM AST by NWS San Juan PR

Effective: Fri September 12, 2025, 2:14 AM
Expires: Fri September 12, 2025, 4:00 PM

* WHAT...This level of heat affect most individuals sensitive to heat, especially those without effective cooling and/or adequate hydration. Impacts possible in some health system and in heat-sensitive industries. * WHERE...All urban and coastal areas, as well as the eastern interior, Vieques, Culebra in Puerto Rico, and all of the U.S. Virgin Islands. * WHEN...From 10 AM this morning to 4 PM AST this afternoon. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses.

Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning or evening. Take action when you see symptoms of heat exhaustion and heat stroke. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1.


Friday, September 12, 2025

Weather Forecast

Conditions: Sunny
Average Temperature: 83.2°F
Average Humidity: 80%
Chance of Rain: 0%
Wind: 13.9 mph
UV Index: 2.7

Air Quality

AQI: 1 - Good
PM2.5: 9.26 μg/m3
PM10: 24.19 μg/m3
Carbon Monoxide: 180.86 μg/m3
Nitrogen Dioxide: 0.53 μg/m3
Sulphur Dioxide: 0.58 μg/m3
Ozone: 40.6 μg/m3

Astronomical

Sunrise: 6:07 AM
Sun Transit: 12:15 AM
Sunset: 6:24 PM
Daylight: 12 hrs 17 mins
Moonrise: 10:12 PM
Moon Transit: 4:05 AM
Moonset: 10:54 AM
Moon Phase: Waning Gibbous
Moon Illumination: 67.4%

Best Times for Fishing or Hunting

Major Periods

3:35 AM - 6:05 AM
7:34 PM - 10:04 PM

Minor Periods

9:42 PM - 11:12 PM
10:24 AM - 11:54 AM

Action Rating: 3 out of 5

Saturday, September 13, 2025

Weather Forecast

Conditions: Partly Cloudy
Average Temperature: 83.4°F
Average Humidity: 81%
Chance of Rain: 0%
Wind: 19.2 mph
UV Index: 2.7

Air Quality

AQI: 1 - Good
PM2.5: 6.39 μg/m3
PM10: 10.92 μg/m3
Carbon Monoxide: 177.97 μg/m3
Nitrogen Dioxide: 0.73 μg/m3
Sulphur Dioxide: 1.04 μg/m3
Ozone: 39.32 μg/m3

Astronomical

Sunrise: 6:07 AM
Sun Transit: 12:14 AM
Sunset: 6:23 PM
Daylight: 12 hrs 16 mins
Moonrise: 11:09 PM
Moon Transit: 5:04 AM
Moonset: 12:00 AM
Moon Phase: Waning Gibbous
Moon Illumination: 56.4%

Best Times for Fishing or Hunting

Major Periods

4:34 AM - 7:04 AM
8:35 PM - 11:05 PM

Minor Periods

12:00 AM - 12:00 AM
11:30 AM - 1:00 PM

Action Rating: 2 out of 5

Sunday, September 14, 2025

Weather Forecast

Conditions: Patchy rain nearby
Average Temperature: 83.5°F
Average Humidity: 82%
Chance of Rain: 81%
Wind: 20.4 mph
UV Index: 2.7

Air Quality

AQI: 1 - Good
PM2.5: 4.32 μg/m3
PM10: 6.73 μg/m3
Carbon Monoxide: 186.63 μg/m3
Nitrogen Dioxide: 0.81 μg/m3
Sulphur Dioxide: 1.41 μg/m3
Ozone: 40.4 μg/m3

Astronomical

Sunrise: 6:07 AM
Sun Transit: 12:14 AM
Sunset: 6:22 PM
Daylight: 12 hrs 15 mins
Moonrise: 12:09 AM
Moon Transit: 6:06 AM
Moonset: 1:04 PM
Moon Phase: Last Quarter
Moon Illumination: 45.1%

Best Times for Fishing or Hunting

Major Periods

5:36 AM - 8:06 AM
12:00 AM - 12:00 AM

Minor Periods

12:34 AM - 2:04 PM
12:00 AM - 12:00 AM

Action Rating: 2 out of 5

Monday, September 15, 2025

Weather Forecast

Conditions: Moderate rain
Average Temperature: 83.9°F
Average Humidity: 77%
Chance of Rain: 89%
Wind: 20.6 mph
UV Index: 0.2

Air Quality

AQI: 1 - Good
PM2.5: 7.21 μg/m3
PM10: 11.51 μg/m3
Carbon Monoxide: 204.46 μg/m3
Nitrogen Dioxide: 0.7 μg/m3
Sulphur Dioxide: 1.25 μg/m3
Ozone: 39.28 μg/m3

Astronomical

Sunrise: 6:07 AM
Sun Transit: 12:14 AM
Sunset: 6:21 PM
Daylight: 12 hrs 14 mins
Moonrise: 12:10 AM
Moon Transit: 7:08 AM
Moonset: 2:05 PM
Moon Phase: Last Quarter
Moon Illumination: 34.0%

Best Times for Fishing or Hunting

Major Periods

6:38 AM - 9:08 AM
12:00 AM - 12:00 AM

Minor Periods

1:35 PM - 3:05 PM
12:00 AM - 12:00 AM

Action Rating: 2 out of 5

Tuesday, September 16, 2025

Weather Forecast

Conditions: Moderate rain
Average Temperature: 83.7°F
Average Humidity: 77%
Chance of Rain: 87%
Wind: 18.1 mph
UV Index: 6

Air Quality

AQI: 1 - Good
PM2.5: 9.86 μg/m3
PM10: 16.17 μg/m3
Carbon Monoxide: 209.05 μg/m3
Nitrogen Dioxide: 0.56 μg/m3
Sulphur Dioxide: 0.4 μg/m3
Ozone: 39 μg/m3

Astronomical

Sunrise: 6:07 AM
Sun Transit: 12:13 AM
Sunset: 6:20 PM
Daylight: 12 hrs 13 mins
Moonrise: 1:13 AM
Moon Transit: 8:07 AM
Moonset: 2:58 PM
Moon Phase: Last Quarter
Moon Illumination: 23.8%

Best Times for Fishing or Hunting

Major Periods

7:37 AM - 10:07 AM
12:00 AM - 12:00 AM

Minor Periods

2:28 PM - 3:58 PM
12:43 AM - 2:13 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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