Snow Squalls May Impact the Northeast on Thursday; Dangerously Cold Arctic Air Impact the North-Central US

Snow showers and snow squalls are likely to develop across the Northeast on Thursday. Lake effect snow will persist downwind of the Great Lakes. An arctic blast will bring frigid temperatures, gusty winds and dangerous wind chills to the Northern Plains before expanding to the South and East. A major winter storm will begin impacting the Southern Plains and Lower Mississippi Valley Friday. Read More >

Hazardous Weather Conditions

Small Craft Advisory until January 23, 05:00 PM EST

For More Weather Information:

San Juan, PR Local Forecast Office

4NM NW San Juan PR

Marine Point Forecast

[NOTICE]

Overnight
Low: 80 °F
E 13kt
6ft

Small Craft Advisory
Thursday
High: 82 °F
E 16kt
6ft

Small Craft Advisory
Thursday Night
Low: 80 °F
E 11kt
5-6ft

Small Craft Advisory
Friday
High: 82 °F
E 14kt
5ft

Small Craft Advisory
Friday Night
Low: 80 °F
E 9kt
5ft
Saturday
High: 82 °F
E 13kt
4ft
Saturday Night
Low: 80 °F
E 8kt
4ft
Sunday
High: 82 °F
E 13kt
4ft
Sunday Night
Low: 80 °F
E 9kt
4ft

High and low forecast temperature values represent air temperature.

Associated Zone Forecast which includes this point

Last Update: 7:40 pm EST Jan 21, 2026
Forecast Valid: 11pm EST Jan 21, 2026-6pm EST Jan 28, 2026

View Nearby Observations

Detailed Forecast

...SMALL CRAFT ADVISORY IN EFFECT THROUGH FRIDAY AFTERNOON...

Overnight

E wind around 13 kt. Showers likely, mainly after 2am. Seas around 6 ft.

Thursday

E wind 13 to 16 kt, with gusts as high as 22 kt. Scattered showers before 11am, then showers likely and possibly a thunderstorm between 11am and 2pm, then scattered showers after 2pm. Seas around 6 ft.

Thursday Night

E wind 7 to 11 kt. Scattered showers. Seas 5 to 6 ft.

Friday

E wind 8 to 14 kt. Scattered showers. Seas around 5 ft.

Friday Night

E wind 7 to 9 kt. Scattered showers, mainly after 11pm. Seas around 5 ft.

Saturday

E wind 7 to 13 kt. Scattered showers, mainly before 11am. Seas around 4 ft.

Saturday Night

E wind around 8 kt. Partly cloudy. Seas around 4 ft.

Sunday

E wind 9 to 13 kt. Mostly sunny. Seas around 4 ft.

Sunday Night

E wind around 9 kt. Mostly clear. Seas around 4 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.