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

Hydrologic Outlook issued April 10 at 11:19AM AST by NWS San Juan PR

Effective: Fri April 10, 2026, 11:19 AM
Expires: Sat April 11, 2026, 11:30 PM

ESFSJU A mid to upper level trough is expected to move across Hispaniola on Sunday, reaching Puerto Rico and the Virgin Islands late Sunday into Monday. The trough will also reflect at the surface, with the axis reaching the islands Monday night into early Tuesday. The first round of showers is expected to reach the region Sunday night into early Monday. On Monday morning, showers and isolated thunderstorms will stream across the Virgin Islands and portions of eastern Puerto Rico. Then, in the afternoon, stronger activity is expected to develop for the interior, moving into portions of the south-central, west and southwest Puerto Rico. By late Monday into Tuesday, conditions are expected to be even more favorable for periods of heavy rain across the islands, but especially strong along St. Thomas and St. John, Vieques, Culebra, eastern and northern Puerto Rico. Soils continue to be saturated along the east and south of Puerto Rico, but a break in recent rainfalls will allow for the soil to dry a little. Streams are mostly running near normal or high across the entire region. Taking all these factors into consideration, the likelihood of urban and small stream flooding, isolated flash flooding, landslides and rapid river rises is increasing. While it is too early to determine how much rainfall will fall, the most likely scenario is for 1 to 3" each day, and isolated higher amounts. So far, the days with the highest potential for flooding are Monday and Tuesday, but above normal moisture will persist through late in the workweek. At this time, the confidence in the forecast is medium, but increasing, especially since there has been some consistency between runs of the global guidance. However, some uncertainty still exist in the exact amounts, timing and locations most affected. It is also worth mentioning that cloud coverage could also impact the amounts of rainfall expected, as cloudy skies tend to inhibit heavy rain formation. This product will be updated as necessary to reflect updates in the forecast.

Hydrologic Outlook issued April 11 at 7:19AM AST by NWS San Juan PR

Effective: Sat April 11, 2026, 7:19 AM
Expires: Sat April 11, 2026, 12:00 PM

ESFSJU A mid to upper level trough is expected to move across Hispaniola on Sunday, reaching Puerto Rico and the Virgin Islands late Sunday into Monday. The trough will also reflect at the surface, with the axis reaching the islands Monday night into early Tuesday. The first round of showers is expected to reach the region Sunday night into early Monday. On Monday morning, showers and isolated thunderstorms will stream across the Virgin Islands and portions of eastern Puerto Rico. Then, in the afternoon, stronger activity is expected to develop for the interior, moving into portions of the south-central, west and southwest Puerto Rico. By late Monday into Tuesday, conditions are expected to be even more favorable for periods of heavy rain across the islands, but especially strong along St. Thomas and St. John, Vieques, Culebra, eastern and northern Puerto Rico. Soils continue to be saturated along the east and south of Puerto Rico, but a break in recent rainfalls will allow for the soil to dry a little. Streams are mostly running near normal or high across the entire region. Taking all these factors into consideration, the likelihood of urban and small stream flooding, isolated flash flooding, landslides and rapid river rises is increasing. While it is too early to determine how much rainfall will fall, the most likely scenario is for 1 to 3" each day, and isolated higher amounts. So far, the days with the highest potential for flooding are Monday and Tuesday, but above normal moisture will persist through late in the workweek. At this time, the confidence in the forecast is medium, but increasing, especially since there has been some consistency between runs of the global guidance. However, some uncertainty still exist in the exact amounts, timing and locations most affected. It is also worth mentioning that cloud coverage could also impact the amounts of rainfall expected, as cloudy skies tend to inhibit heavy rain formation. This product will be updated as necessary to reflect updates in the forecast.

Flood Watch issued April 11 at 11:13AM AST until April 15 at 8:00AM AST by NWS San Juan PR

Effective: Sat April 11, 2026, 11:13 AM
Expires: Wed April 15, 2026, 8:00 AM

* WHAT...Flooding caused by excessive rainfall is possible. * WHERE...All of Puerto Rico and the Virgin Islands. * WHEN...From Monday morning through Wednesday morning. * IMPACTS...Flooding may occur in poor drainage and urban areas. Low-water crossings may be flooded. Rapid river rises and landslides in areas of steep terrain. * ADDITIONAL DETAILS... - As a trough approaches from the northwest, the likelihood of flooding is increasing. Showers and thunderstorms will increase in frequency starting Monday, but the heaviest activity is anticipated for Monday night into Tuesday. Based on the latest guidance and the atmospheric set-up, the confidence in the forecast is medium. - http://www.weather.gov/safety/flood

You should monitor later forecasts and be alert for possible Flood Warnings. Those living in areas prone to flooding should be prepared to take action should flooding develop.

Rip Current Statement issued April 11 at 10:53AM AST until April 13 at 6:00PM AST by NWS San Juan PR

Effective: Sat April 11, 2026, 10:53 AM
Expires: Sat April 11, 2026, 7:00 PM

* WHAT...Life-threatening rip currents. * WHERE...Northwest to northeast beaches of Puerto Rico, including beaches in Rincon, Aguada, and Culebra. * WHEN...Through Monday afternoon. * IMPACTS...Rip currents can sweep even the best swimmers away from shore into deeper water, where it becomes difficult to return to safety.

There is a high risk of rip currents. Rip currents are powerful channels of water flowing quickly away from shore, which occur most often at low spots or breaks in the sandbar and in the vicinity of structures such as groins, jetties and piers. Heed the advice of lifeguards, beach patrol flags and signs. If you become caught in a rip current, yell for help. Remain calm, do not exhaust yourself and stay afloat while waiting for help. If you have to swim out of a rip current, swim parallel to shore and back toward the beach when possible. Do not attempt to swim directly against a rip current as you will tire quickly.