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4NM NW San Juan PR

[NOTICE]

High and low forecast temperature values represent air temperature.

Last Update: 4:17 am EDT May 20, 2026
Forecast Valid: 5am EDT May 20, 2026-6pm EDT May 26, 2026

...SMALL CRAFT SHOULD EXERCISE CAUTION...

Today

E wind 8 to 17 kt, with gusts as high as 23 kt. Isolated showers before 9am, then scattered showers after noon. Seas around 4 ft.

Tonight

ESE wind 9 to 11 kt. Scattered showers, mainly after 3am. Seas around 4 ft.

Thursday

E wind 10 to 16 kt, with gusts as high as 22 kt. Scattered showers, mainly after 3pm. Seas around 4 ft.

Thursday Night

E wind 8 to 11 kt. Scattered showers. Seas around 4 ft.

Friday

E wind 9 to 16 kt. Scattered showers. Seas 3 to 4 ft.

Friday Night

E wind 7 to 10 kt. Isolated showers. Seas around 3 ft.

Saturday

E wind 9 to 15 kt. Scattered showers after noon. Seas around 3 ft.

Saturday Night

E wind 8 to 11 kt. Scattered showers. Seas around 3 ft.

Sunday

E wind 11 to 14 kt, with gusts as high as 20 kt. Scattered showers. 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.