Straits of Florida from Craig Key to West End of Seven Mile Bridge Out 20 NM Marine Forecast
| Today...South Winds Near 10 Knots, Except 5 To 10 Knots Off The Upper Keys, Becoming Southeast To South. Seas 1 To 2 Feet. Wave Detail: South 1 Foot At 3 Seconds. A Slight Chance Of Showers And Thunderstorms, Mainly This Morning. |
| Tonight...East To Southeast Winds 5 To 10 Knots, Becoming Southeast And Increasing To 10 To 15 Knots After Midnight. Seas 1 To 2 Feet, Building To 2 To 3 Feet. Wave Detail: Southeast 2 Feet At 4 Seconds. A Chance Of Showers With A Slight Chance Of Thunderstorms. |
| Friday...Southeast Winds Near 15 Knots. Seas 2 To 3 Feet, Building To 3 To 4 Feet, Occasionally To 5 Feet. West Of Halfmoon Shoal Light, Seas 3 To 4 Feet, Occasionally To 5 Feet, Building To 4 To 6 Feet, Occasionally To 8 Feet Due To A West Swell. Wave Detail: East To Southeast 3 Feet At 4 Seconds And Southwest To West 2 Feet At 11 Seconds. A Chance Of Showers With A Slight Chance Of Thunderstorms. |
| Friday Night...Southeast Winds Near 15 Knots. Seas 4 To 5 Feet, Occasionally To 6 Feet Due To A West Swell. Showers Likely With A Chance Of Thunderstorms. |
| Saturday...Southeast To South Winds Near 15 Knots, Becoming Southeast And Decreasing To 10 To 15 Knots. Seas 3 To 5 Feet, Occasionally To 6 Feet. A Chance Of Showers And Thunderstorms. |
| Saturday Night...East To Southeast Winds 10 To 15 Knots, Increasing To 15 To 20 Knots After Midnight. Seas 3 To 4 Feet, Occasionally To 5 Feet, Building To 4 To 5 Feet, Occasionally To 6 Feet. A Chance Of Showers And Thunderstorms. |
| Sunday...East To Southeast Winds Near 15 Knots, Decreasing To 10 To 15 Knots. Seas 3 To 5 Feet, Occasionally To 6 Feet, Subsiding To 2 To 4 Feet, Occasionally To 5 Feet. A Slight Chance Of Showers And Thunderstorms. |
| Sunday Night...East Winds 10 To 15 Knots, Decreasing To Near 10 Knots. Seas 2 To 3 Feet. A Slight Chance Of Showers And Thunderstorms. |
| Monday...Northeast To East Winds 5 To 10 Knots. Seas Around 2 Feet. A Slight Chance Of Showers. |
| Monday Night...Northeast To East Winds 5 To 10 Knots. Seas 1 To 2 Feet. A Slight Chance Of Showers And Thunderstorms. |
| Area Forecast Discussion National Weather Service Key West FL 449am EDT Thu Oct 8 2026 Issued at 449am EDT Thu Oct 8 2026 CIMSS products continues to show a complex pattern in place across the Lower 48, Gulf and western North Atlantic. We now have Hurricane Isaias which is centered over the southwestern Gulf to the north of the Yucatan Peninsula. A stationary front remains in place across central Florida, stretching from just west of Tampa eastward to just north of Lake Okeechobee. Additionally, there are two ridges on either side of Hurricane Isaias with one over the South-central U.S. and the other over the western North Atlantic centered to the northeast of the Lesser Antilles. At the surface, weak ridging remains as the main ridge over the Atlantic has loosened its grip quite a bit this morning. Marine platforms surrounding the Island Chain are recording variable breezes of 5 knots or less as a result. KBYX radar has been active all night with showers and even a few thunderstorms. The activity has waffled from area to area, though, the main area has been across the SE Gulf and the distant Straits of Florida to the south of the Lower Keys overnight. There was also earlier activity in the Upper Keys and surrounding nearshore waters with the new activity infringing on the Middle Keys. Temperatures along the Island Chain are in the lower 80s and dew points are in the mid to upper 70s. The cool spot currently is the Big Pine Key RAWS which has dipped to 77 degrees so far early this morning. .FORECAST... Taking the zoomed out look at the weather, we have Hurricane Isaias which continues to lumber along. Isaias is currently over the southwest Gulf to the north of the Yucatan Peninsula and will eventually turn northward towards the North Gulf Coast heading into the holiday weekend. All this to say, Isaias does not pose any threat to the Keys. However, the synoptic scale weather features combined with Isaias will influence the sensible weather to an extent across our area, namely in the form of winds and seas. Breezes will slowly freshen over the next few forecast periods while also shifting to the east to southeast by the weekend. Basically, Isaias to the west and the high over the Atlantic will lead to a tightening of the pressure gradient across the area leading to the freshening breezes. In addition, the storm will send out some swell to the east which will especially impact the westernmost portions of the Florida Keys coastal waters. This will mostly be near and surrounding the Dry Tortugas. Moisture will remain plentiful this morning before the southerly flow in place across the region sends drier air northward from Cuba. This will lead to diminishing rain chances. An upper level piece of energy, currently over Hispaniola will continue its trek northwestward around the periphery of the high in the Atlantic. This energy is expected to reach the Keys sometime Friday/Friday night resulting in another uptick in moisture and thus rain and thunder chances. Ridging is expected to dominate for the second half of the holiday weekend including the holiday itself. As the ridging take hold, breezes are expected to slacken along with drier air leading to decreased rain chances. Expect daytime highs to remain quite warm in the upper 80s and overnight lows in the lower 80s with dew points potentially hovering near 80 degrees through this period. Very warm and tropical for considering we are approaching mid- October at this point. Numerical and global model guidance is suggesting signs for a frontal boundary to potentially press through the Keys as we head into the middle of next week. Could there be potential relief from the humidity to take the edge off as we near the middle of October? Time will tell. We will continue to fine tune this in the coming days. Marine Issued at 449am EDT Thu Oct 8 2026 There are currently no watches, warning, or advisories in effect across the Florida Keys. Boaters should be aware of less clearance under fixed bridges around times of high tide as a Coastal Flood Statement is in effect for the Florida Keys. From synopsis, Hurricane Isaias, currently over the southwestern Gulf waters, is expected to move towards the North Gulf Coast over the next few days, strengthening as it does so. A cold front remains draped across north-central Florida which will slowly press southward infringing on the surface ridge to its south. In doing so, these systems will act in tandem and create a tightening pressure gradient across the Keys, resulting in freshening mainly southeast breezes as we head into the weekend. In addition, moisture will also be on the rise leading to higher rain and thunder chances. Any showers and storms will be capable of causing hazardous marine conditions through the weekend. Climate On this day in 2020, the daily record warm low temperature of 83F was recorded in Key West. Temperature records for Key West date back to 1872. On this day in 2012, the daily record warm low temperature of 82F was recorded in Marathon. Temperature records for Marathon date back to 1950. NOAA Key West FL Office: Watches - Warnings - Advisories FL...None. GM...None. |
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