Dangerous Heat and Heavy Rainfall into the Weekend

Hot temperatures and high humidity are forecast to continue across the mid-Mississippi Valley into this weekend. Heat Advisories remain in effect. Heavy to excessive rainfall occurring at times through the weekend could bring areas of flooding to parts of the northern Rockies, upper Midwest, central Great Lakes, and southern New England. Read More >

Last Update: 443 PM EDT Sat Sep 19 2026

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Key West, FL Local Forecast Office

23NM N Smith Shoal Light FL

Marine Zone Forecast

Tonight

Variable winds near 5 knots, becoming southeast to south. Seas 1 foot or less. Wave detail: east 1 foot at 2 seconds. Showers likely with a chance of thunderstorms. Winds and seas higher in the vicinity of any thunderstorm.

Sunday

South winds near 5 knots. Seas 1 foot or less. Wave detail: south 1 foot at 2 seconds. Showers likely with a chance of thunderstorms.

Sunday Night

Southeast to south winds near 5 knots, increasing to near 10 knots. Seas building to around 1 foot. Wave detail: south 1 foot at 3 seconds. Showers likely with a chance of thunderstorms.

Monday

South to southwest winds near 5 knots. Seas 1 foot or less. Showers likely with a chance of thunderstorms.

Monday Night

South winds 5 to 10 knots. Seas around 1 foot. showers likely with a chance of thunderstorms.

Tuesday

South winds near 5 knots, becoming southeast to south and increasing to 5 to 10 knots. Seas around 1 foot. Showers likely with a chance of thunderstorms.

Tuesday Night

Southeast to south winds 5 to 10 knots. Seas around 1 foot. A chance of thunderstorms. Showers likely.

Wednesday

Southeast winds near 5 knots. Seas around 1 foot. Showers likely with a chance of thunderstorms.

Wednesday Night Through Thursday Night

East to southeast winds 5 to 10 knots. Seas around 1 foot. A chance of showers with a slight chance of thunderstorms.