Heavy Great Lakes Snow through Friday; Extreme Cold and Potential for Major Winter Storm Late Week into this Weekend

Multiple clipper systems will bring cold temperatures and enhance lake-effect snow downwind of the Great Lakes. An arctic blast will bring frigid temperatures accompanied with gusty winds that may lead to dangerous wind chills beginning in the Northern Plains Thursday before expanding to the South and East. An expansive winter storm will start Friday in the Southern Rockies/Plains and Mid-South. 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]

This Afternoon
High: 82 °F
E 15kt
6ft

Small Craft Advisory
Tonight
Low: 80 °F
E 14kt
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
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

High and low forecast temperature values represent air temperature.

Associated Zone Forecast which includes this point

Last Update: 3:14 pm EST Jan 21, 2026
Forecast Valid: 4pm EST Jan 21, 2026-6pm EST Jan 28, 2026

View Nearby Observations

Detailed Forecast

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

This Afternoon

E wind around 15 kt, with gusts as high as 21 kt. Scattered showers, mainly before 5pm. Seas around 6 ft.

Tonight

E wind 12 to 14 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 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.

*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.