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

Current Water Temperature

81.7°F

Measurement Time: Thursday, April 30, 2026, 7:00 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

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 mi)
Caribbean Sea, Esperanza, PR (47.7 mi)
Atlantic Ocean, San Juan, PR (89 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 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

81°F
Partly cloudy
Partly cloudy
86.1°F
86.5°F
79%
ESE 20.1 mph
27.2 mph
81.1°F
72.4°F
0 in
75%
9 mi
1016 mbar
0

Five Day Weather Forecast

Patchy rain nearby
Thu
H: 82°F
L: 81°F
Patchy rain nearby
Fri
H: 82°F
L: 81°F
Patchy rain nearby
Sat
H: 82°F
L: 80°F
Patchy rain nearby
Sun
H: 82°F
L: 81°F
Patchy rain nearby
Mon
H: 82°F
L: 81°F

Air Quality

AQI: 1 - Good
PM2.5: 9.15 μg/m3
PM10: 14.75 μg/m3
Carbon Monoxide: 115.85 μg/m3
Nitrogen Dioxide: 1.25 μg/m3
Sulphur Dioxide: 1.25 μg/m3
Ozone: 50 μg/m3

Astronomical

Sunrise: 5:46 AM
Sun Transit: 12:15 AM
Sunset: 6:45 PM
Daylight: 12 hrs 59 mins
Moonrise: 3:40 AM
Moon Transit: 10:07 AM
Moonset: 4:39 PM
Moon Phase: Waning Crescent
Moon Illumination: 0.7%

Best Times for Fishing or Hunting

Major Periods

12:40 AM - 3:10 AM
9:37 AM - 12:07 AM

Minor Periods

4:09 PM - 5:39 PM
3:10 AM - 4:40 AM

Action Rating: 2 out of 5

Heat Advisory issued May 14 at 2:29AM AST until May 14 at 4:00PM AST by NWS San Juan PR

Effective: Thu May 14, 2026, 2:29 AM
Expires: Thu May 14, 2026, 10:30 AM

* 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...Portions of Puerto Rico and Virgin Islands. * WHEN...From 11 AM this morning to 4 PM AST this afternoon. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses.

Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors.
Thursday, May 14, 2026

Weather Forecast

Patchy rain nearby
81.8°F
81°F
81.4°F
75%
0.04 in
89%
0%
21.3 mph
12.8


Air Quality

AQI: 1 - Good
PM2.5: 8.79 μg/m3
PM10: 14.07 μg/m3
Carbon Monoxide: 116.29 μg/m3
Nitrogen Dioxide: 1.3 μg/m3
Sulphur Dioxide: 1.41 μg/m3
Ozone: 54.24 μg/m3

Astronomical

Sunrise: 5:46 AM
Sun Transit: 12:15 AM
Sunset: 6:45 PM
Daylight: 12 hrs 59 mins
Moonrise: 3:40 AM
Moon Transit: 10:07 AM
Moonset: 4:39 PM
Moon Phase: Waning Crescent
Moon Illumination: 0.7%

Best Times for Fishing or Hunting

Major Periods

12:40 AM - 3:10 AM
9:37 AM - 12:07 AM

Minor Periods

4:09 PM - 5:39 PM
3:10 AM - 4:40 AM

Action Rating: 2 out of 5

Friday, May 15, 2026

Weather Forecast

Patchy rain nearby
81.9°F
80.8°F
81.3°F
76%
0.12 in
86%
0%
20.8 mph
2.1


Air Quality

AQI: 1 - Good
PM2.5: 9.79 μg/m3
PM10: 15.87 μg/m3
Carbon Monoxide: 111.61 μg/m3
Nitrogen Dioxide: 1.32 μg/m3
Sulphur Dioxide: 1.25 μg/m3
Ozone: 62.32 μg/m3

Astronomical

Sunrise: 5:46 AM
Sun Transit: 12:15 AM
Sunset: 6:46 PM
Daylight: 13 hrs mins
Moonrise: 4:24 AM
Moon Transit: 11:01 AM
Moonset: 5:43 PM
Moon Phase: New
Moon Illumination: 0.1%

Best Times for Fishing or Hunting

Major Periods

1:33 AM - 4:03 AM
10:31 AM - 1:01 PM

Minor Periods

5:13 PM - 6:43 PM
3:54 AM - 5:24 AM

Action Rating: 5 out of 5

Saturday, May 16, 2026

Weather Forecast

Patchy rain nearby
82.1°F
80.3°F
81.2°F
76%
0.07 in
85%
0%
21.7 mph
6


Air Quality

AQI: 1 - Good
PM2.5: 11.55 μg/m3
PM10: 19.1 μg/m3
Carbon Monoxide: 119.44 μg/m3
Nitrogen Dioxide: 1.31 μg/m3
Sulphur Dioxide: 1.17 μg/m3
Ozone: 55.2 μg/m3

Astronomical

Sunrise: 5:45 AM
Sun Transit: 12:15 AM
Sunset: 6:46 PM
Daylight: 13 hrs 1 mins
Moonrise: 5:13 AM
Moon Transit: 12:00 AM
Moonset: 6:51 PM
Moon Phase: New
Moon Illumination: 2.0%

Best Times for Fishing or Hunting

Major Periods

2:30 AM - 5:00 AM
11:30 AM - 2:00 PM

Minor Periods

6:21 PM - 7:51 PM
4:43 AM - 6:13 AM

Action Rating: 5 out of 5

Sunday, May 17, 2026

Weather Forecast

Patchy rain nearby
81.6°F
80.6°F
81°F
75%
0.07 in
89%
0%
21.9 mph
6


Air Quality

AQI: 1 - Good
PM2.5: 10.5 μg/m3
PM10: 17.45 μg/m3
Carbon Monoxide: 110.34 μg/m3
Nitrogen Dioxide: 1.27 μg/m3
Sulphur Dioxide: 1.14 μg/m3
Ozone: 56.56 μg/m3

Astronomical

Sunrise: 5:45 AM
Sun Transit: 12:15 AM
Sunset: 6:46 PM
Daylight: 13 hrs 1 mins
Moonrise: 6:10 AM
Moon Transit: 1:04 PM
Moonset: 8:02 PM
Moon Phase: New
Moon Illumination: 0.2%

Best Times for Fishing or Hunting

Major Periods

3:32 AM - 6:02 AM
12:34 AM - 3:04 PM

Minor Periods

7:32 PM - 9:02 PM
5:40 AM - 7:10 AM

Action Rating: 5 out of 5

Monday, May 18, 2026

Weather Forecast

Patchy rain nearby
81.5°F
80.6°F
81.2°F
72%
0.08 in
88%
0%
23.3 mph
6


Air Quality

AQI: 1 - Good
PM2.5: 9.13 μg/m3
PM10: 14.98 μg/m3
Carbon Monoxide: 108.7 μg/m3
Nitrogen Dioxide: 1.33 μg/m3
Sulphur Dioxide: 1.09 μg/m3
Ozone: 65.77 μg/m3

Astronomical

Sunrise: 5:45 AM
Sun Transit: 12:15 AM
Sunset: 6:47 PM
Daylight: 13 hrs 2 mins
Moonrise: 7:13 AM
Moon Transit: 2:11 PM
Moonset: 9:10 PM
Moon Phase: New
Moon Illumination: 2.6%

Best Times for Fishing or Hunting

Major Periods

4:39 AM - 7:09 AM
1:41 PM - 4:11 PM

Minor Periods

8:40 PM - 10:10 PM
6:43 AM - 8:13 AM

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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