Frigid Airmass to Bring Significantly Colder Temperatures; Snow Continues Downwind of the Great Lakes

A frigid cold airmass will bring significantly colder weather across the eastern two thirds of the country early this week. Record low temperatures are expected in the Southeast by Tuesday morning. Moderate to heavy lake effect snow will continue downwind of the Great Lakes through Monday. Several inches of snow accumulation is expected, including in portions of the Chicago Metro Read More >

Last Update: 1024 PM EST Sun Nov 9 2025

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Key West, FL Local Forecast Office

5NM NE Key West FL

Marine Zone Forecast

Overnight

Variable winds near 5 knots, becoming west to northwest and increasing to near 10 knots. Seas 1 foot or less, building to around 1 foot. Nearshore waters smooth, becoming a light chop. Isolated showers.

Monday

Northwest winds 10 to 15 knots, becoming northwest to north and increasing to 25 to 30 knots. Seas 1 to 2 feet, building to 3 to 5 feet, occasionally to 6 feet. West of the marquesas keys, seas around 2 feet, building to 5 to 7 feet, occasionally to 9 feet. Nearshore waters a light to moderate chop, becoming extremely rough. Scattered showers.

Monday Night

North winds near 30 knots. Seas 4 to 6 feet, occasionally to 8 feet, except 8 to 10 feet, occasionally to 13 feet west of the marquesas keys. Nearshore waters extremely rough.

Tuesday

North to northeast winds 25 to 30 knots, decreasing to 20 to 25 knots. Seas 4 to 6 feet, occasionally to 8 feet, except 7 to 10 feet, occasionally to 13 feet west of the marquesas keys. nearshore waters extremely rough, becoming very rough.

Tuesday Night

Northeast winds 20 to 25 knots, decreasing to 15 to 20 knots. Seas 3 to 5 feet, occasionally to 6 feet, except 5 to 7 feet, occasionally to 9 feet west of the marquesas keys. nearshore waters very rough, becoming choppy.

Wednesday

Northeast winds 15 to 20 knots. Seas 2 to 4 feet, occasionally to 5 feet, except 4 to 5 feet, occasionally to 6 feet west of the marquesas keys. Nearshore waters choppy.

Wednesday Night

Northeast winds 10 to 15 knots. Seas 2 to 3 feet, except around 3 feet west of the marquesas keys. Nearshore waters a light to moderate chop.

Thursday

Northeast winds near 15 knots. Seas 2 to 3 feet, except around 3 feet west of the marquesas keys. Nearshore waters a moderate chop.

Thursday Night Through Friday Night

Northeast winds 10 to 15 knots. Seas 1 to 2 feet, except around 2 feet west of the marquesas keys. Nearshore waters a light to moderate chop.