Prolonged Atmospheric River in the Northwest; Snow in the North-Central US

A prolonged atmospheric river will bring heavy rainfall which may lead to widespread urban and river flooding, heavy mountain snow, along with gusty winds to the Pacific Northwest into the northern Rockies through much of the week. A clipper will bring a period of snow across the upper Midwest and the Great Lakes into Tuesday, before a stronger system bring more wintry impacts. Read More >

Hazardous Weather Conditions

Last Update: 412 AM AST Tue Dec 9 2025

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San Juan, PR Local Forecast Office

51NM N San Juan PR

Marine Zone Forecast


Today
Southeast winds 10 to 15 knots with gusts up to 20 knots. Seas 4 to 5 feet. Wave detail: east 4 feet at 9 seconds and north 2 feet at 13 seconds. Scattered showers early this morning, then isolated showers late this morning and afternoon.
Tonight
East winds 10 to 15 knots with gusts up to 20 knots. Seas 4 to 5 feet. Wave detail: east 4 feet at 8 seconds and north 2 feet at 15 seconds. Scattered showers after midnight.
Wednesday
East winds 10 to 15 knots, increasing to 15 to 20 knots in the afternoon. Seas 4 to 6 feet. Wave detail: east 5 feet at 8 seconds and north 2 feet at 14 seconds.
Wednesday Night
East winds 15 to 20 knots with gusts up to 25 knots. Seas 4 to 6 feet. Wave detail: east 5 feet at 8 seconds and north 2 feet at 13 seconds. Scattered showers after midnight.
Thursday
East winds 15 to 20 knots, diminishing to 10 to 15 knots in the afternoon. Seas 5 to 7 feet. Wave detail: east 5 feet at 8 seconds and north 4 feet at 13 seconds.
Thursday Night
East winds 10 to 15 knots with gusts up to 25 knots. Seas 6 to 7 feet. Wave detail: east 5 feet at 8 seconds and north 4 feet at 12 seconds.
Friday
East winds around 15 knots. Seas 6 to 7 feet.
Friday Night
East winds 15 to 20 knots. Seas 6 to 7 feet.
Saturday
East winds 15 to 20 knots. Seas 6 to 7 feet. Scattered showers in the morning.
Saturday Night
East winds 15 to 20 knots. Seas 6 to 7 feet. Scattered showers.



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412 AM AST Tue Dec 9 2025
 
 

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