Marine Weather Net

Gulf of Mexico from Seven Mile Bridge to Halfmoon Shoal Marine Forecast


THIS AFTERNOON

ESE
WINDS
5 - 10
KNOTS

TONIGHT

ENE
WINDS
5 - 10
KNOTS

WEDNESDAY

ENE
WINDS
10
KNOTS

WEDNESDAY NIGHT

ENE
WINDS
5 - 10
KNOTS

The Marine Weather Forecast In Detail:
GMZ035 Forecast Issued: 1037 AM EDT Tue Sep 23 2025

This Afternoon...East To Southeast Winds 5 To 10 Knots. Seas Around 1 Foot. Nearshore Waters Smooth To A Light Chop. Numerous Showers And Scattered Thunderstorms.
Tonight...Northeast To East Winds 5 To 10 Knots, Increasing To 10 To 15 Knots After Midnight. Seas Around 1 Foot, Except Building To 1 To 2 Feet West Of The Marquesas Keys. Nearshore Waters Smooth To A Light Chop, Becoming A Light To Moderate Chop. Scattered Showers And Isolated Thunderstorms.
Wednesday...Northeast To East Winds Near 10 Knots, Decreasing To Near 5 Knots. Seas Around 1 Foot, Subsiding To 1 Foot Or Less. Nearshore Waters A Light Chop, Becoming Smooth. Scattered Showers And Isolated Thunderstorms.
Wednesday Night...Northeast To East Winds 5 To 10 Knots. Seas 1 Foot Or Less. Nearshore Waters Smooth To A Light Chop. Scattered Showers And Isolated Thunderstorms.
Thursday...Northeast To East Winds Near 5 Knots, Becoming Variable. Seas 1 Foot Or Less. Nearshore Waters Smooth. Scattered Showers And Isolated Thunderstorms.
Thursday Night...Variable Winds Near 5 Knots. Seas 1 Foot Or Less. Nearshore Waters Smooth. Scattered Showers And Isolated Thunderstorms.
Friday...Variable Winds Near 5 Knots. Seas 1 Foot Or Less. Nearshore Waters Smooth. Scattered Showers And Isolated Thunderstorms.
Friday Night...Northwest To North Winds Near 5 Knots, Becoming North To Northeast. Seas 1 Foot Or Less. Nearshore Waters Smooth. Scattered Showers And Isolated Thunderstorms.
Saturday...Northwest To North Winds Near 5 Knots, Increasing To 5 To 10 Knots. Seas 1 Foot Or Less. Nearshore Waters Smooth, Becoming Smooth To A Light Chop. Scattered Showers And Isolated Thunderstorms.
Saturday Night...Northwest To North Winds Near 10 Knots, Becoming North To Northeast. Seas Around 1 Foot. Nearshore Waters A Light Chop. Scattered Showers And Isolated Thunderstorms.
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Area Forecast Discussion
National Weather Service Key West FL
1101am EDT Tuesday September 23 2025

Marine
Issued at 1038am EDT Tuesday September 23 2025 There are no watches, warnings, or advisories in effect for the Florida Keys coastal waters. However, a Coast Flood Statement in effect for the Upper Keys means that mariners should be prepared for less clearance underneath fixed bridges. From synopsis, rain and thunder chances will remain elevated through the rest of today as a moisture surge and low-level trough continue to push through the Florida Keys marine zones. High pressure pushing off the Eastern Seaboard will support light to gentle breezes through the rest of the work week, along with a return to near normal rain chances for tonight through Saturday.

Climate
On this day in Keys Weather History in 2023, the daily record rainfall of 1.93" was recorded in Marathon. Rainfall data for Marathon dates back to 1950.

NOAA Key West FL Office: Watches - Warnings - Advisories
FL...None. GM...None.