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4NM NW San Juan PR

[NOTICE]

High and low forecast temperature values represent air temperature.

Last Update: 5:09 am EDT Apr 21, 2026
Forecast Valid: 6am EDT Apr 21, 2026-6pm EDT Apr 27, 2026

Today

SE wind 5 to 12 kt becoming ENE in the afternoon. Isolated showers. Seas around 3 ft.

Tonight

ENE wind 5 to 8 kt. Scattered showers, mainly between 9pm and midnight. Seas 2 to 3 ft.

Wednesday

NE wind 5 to 10 kt. Isolated showers. Seas around 2 ft.

Wednesday Night

ENE wind around 6 kt becoming variable and less than 5 kt after midnight. Isolated showers. Seas 2 to 3 ft.

Thursday

Variable winds less than 5 kt becoming E around 6 kt in the morning. Scattered showers, mainly before noon. Seas 4 to 5 ft.

Thursday Night

E wind around 6 kt becoming variable and less than 5 kt after midnight. Scattered showers. Seas around 4 ft.

Friday

Variable winds less than 5 kt becoming ENE 7 to 12 kt in the morning. Showers likely after noon. Seas around 4 ft.

Friday Night

E wind 5 to 7 kt becoming variable and less than 5 kt after midnight. Partly cloudy. Seas around 4 ft.

Saturday

Variable winds less than 5 kt becoming E 5 to 7 kt in the morning. Showers likely. Seas around 3 ft.

*Notices:

This forecast is for a single location. For safety concerns, mariners should be aware of the weather over a larger area. Forecast information for a larger area can be found within the zone forecast and the NDFD graphics.
The forecast conditions at a particular point may not exceed the criteria of a Small Craft Advisory, Gale, Storm etc. These watches/warnings/advisories are issued for the entire zone in which the point resides and mariners should act accordingly.