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4NM NW San Juan PR

[NOTICE]

High and low forecast temperature values represent air temperature.

Last Update: 6:35 am EDT Mar 21, 2026
Forecast Valid: 12pm EDT Mar 21, 2026-6pm EDT Mar 27, 2026

This Afternoon

S wind 7 to 9 kt. Scattered showers and thunderstorms, then showers likely and possibly a thunderstorm after 3pm. Seas around 4 ft.

Tonight

Variable winds 5 kt or less. Scattered showers, then showers likely and possibly a thunderstorm after 3am. Seas around 4 ft.

Sunday

Variable winds less than 5 kt becoming N 7 to 12 kt in the morning. Showers and possibly a thunderstorm. Seas around 4 ft.

Sunday Night

NE wind around 8 kt. Showers likely and possibly a thunderstorm before 9pm, then scattered showers. Seas around 4 ft.

Monday

NE wind 10 to 12 kt. Showers likely and possibly a thunderstorm. Seas around 4 ft.

Monday Night

ENE wind 8 to 10 kt. Showers likely. Seas around 4 ft.

Tuesday

ENE wind around 9 kt. Showers likely, mainly before noon. Seas around 4 ft.

Tuesday Night

E wind 5 to 7 kt. Showers likely. Seas around 4 ft.

Wednesday

E wind 7 to 12 kt. Scattered showers. Seas 3 to 4 ft.

Winds and seas higher in and near thunderstorms.

*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.