Lake-effect Snow and Whiteout Conditions in the Great Lakes Region; Below-average Temperatures in the East

Heavy lake-effect and lake-enhanced snow will persist downwind of the Great Lakes and produce some whiteout conditions that could cause difficult travel conditions. A coastal low will produce moderate to heavy snow over parts of southern and eastern New England into the afternoon. Below average temperatures are expected across the eastern U.S., particularly with chilly morning temperatures. Read More >

Hazardous Weather Conditions

Small Craft Advisory in effect from January 20, 11:00 AM EST until January 21, 11:00 PM EST

For More Weather Information:

San Juan, PR Local Forecast Office

3NM NW San Juan PR

Marine Point Forecast

[NOTICE]

Overnight
Low: 80 °F
E 11kt
5ft
Tuesday
High: 82 °F
E 16kt
5ft
Tuesday Night
Low: 80 °F
E 12kt
5ft
Wednesday
High: 82 °F
E 18kt
5-6ft
Wednesday Night
Low: 80 °F
E 13kt
6ft
Thursday
High: 82 °F
E 16kt
6ft
Thursday Night
Low: 80 °F
E 9kt
5-6ft
Friday
High: 82 °F
E 14kt
5ft
Friday Night
Low: 80 °F
E 8kt
5ft

High and low forecast temperature values represent air temperature.

Associated Zone Forecast which includes this point

Last Update: 3:07 pm EST Jan 19, 2026
Forecast Valid: 11pm EST Jan 19, 2026-6pm EST Jan 26, 2026

View Nearby Observations

Detailed Forecast

...SMALL CRAFT SHOULD EXERCISE CAUTION...

Overnight

E wind around 11 kt. Showers likely, mainly after 2am. Seas around 5 ft.

Tuesday

E wind 11 to 16 kt. Scattered showers. Seas around 5 ft.

Tuesday Night

E wind around 12 kt. Scattered showers. Seas around 5 ft.

Wednesday

E wind 13 to 18 kt, with gusts as high as 24 kt. Showers likely, mainly before 11am. Seas 5 to 6 ft.

Wednesday Night

E wind around 13 kt. Scattered showers. Seas around 6 ft.

Thursday

E wind 11 to 16 kt, with gusts as high as 22 kt. Showers likely, with thunderstorms also possible after 11am. Seas around 6 ft.

Thursday Night

E wind around 9 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 around 8 kt. Partly cloudy. Seas around 5 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.