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 22, 05:00 PM EST

For More Weather Information:

San Juan, PR Local Forecast Office

4NM NE San Juan PR

Marine Point Forecast

[NOTICE]

Tonight
Low: 76 °F
E 13kt
< 1ft
Wednesday
High: 83 °F
E 17kt
< 1ft
Wednesday Night
Low: 75 °F
ENE 14kt
< 1ft
Thursday
High: 83 °F
E 15kt
< 1ft
Thursday Night
Low: 76 °F
E 10kt
< 1ft
Friday
High: 83 °F
E 14kt
< 1ft
Friday Night
Low: 76 °F
E 10kt
< 1ft
Saturday
High: 82 °F
E 12kt
< 1ft
Saturday Night
Low: 76 °F
E 11kt
< 1ft

High and low forecast temperature values represent air temperature.

Associated Zone Forecast which includes this point

Last Update: 3:47 pm EST Jan 20, 2026
Forecast Valid: 8pm EST Jan 20, 2026-6pm EST Jan 27, 2026

View Nearby Observations

Detailed Forecast

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

Tonight

E wind around 13 kt. Showers likely, mainly after 5am. Seas 1 ft or less.

Wednesday

E wind 13 to 17 kt, with gusts as high as 23 kt. Showers likely, mainly before 8am. Seas 1 ft or less.

Wednesday Night

ENE wind around 14 kt. Scattered showers, then showers likely and possibly a thunderstorm after 11pm. Seas 1 ft or less.

Thursday

E wind 12 to 15 kt. Showers likely and possibly a thunderstorm. Seas 1 ft or less.

Thursday Night

E wind around 10 kt. Showers likely and possibly a thunderstorm. Seas 1 ft or less.

Friday

E wind 10 to 14 kt. Scattered showers and thunderstorms. Seas 1 ft or less.

Friday Night

E wind 8 to 10 kt. Partly cloudy. Seas 1 ft or less.

Saturday

E wind 7 to 12 kt. Sunny. Seas 1 ft or less.

Saturday Night

E wind 9 to 11 kt. Clear. Seas 1 ft or less.

*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.