Marine Weather and Tide Forecast for Port St. Joe, FL

SHORT TERM
(Today through Monday)
Issued at 318 AM EDT Sun Jun 28 2026

Ridging amplifies as the ridge axis shifts into the Mississippi Valley today. Surface high pressure will be centered just off our coast. These will keep a lid on rain chances today, but will also cause the heat to increase quite a bit. We'll add another 2-3 degrees onto yesterday's high temperatures with many areas reaching the mid to upper 90s. Heat index values are a bit tricky this afternoon. We'll likely mix out some of the surface moisture late this morning into the afternoon before the sea breeze moves inland.
The coast will likely stay humid through the day. The best overlap of these very hot temperatures and high humidity will be roughly along and south of a line from Panama City to Crawfordville today, which is where a Heat Advisory is in effect for this afternoon. Heat indices in these areas will be around 108-110. Elsewhere, it will still be hot and humid with heat index values of 102-107 this afternoon. Lows tonight will be in the mid to upper 70s. This provides limited overnight relief.

On Monday, we'll have a bit more moisture returning to the area, which both means a few more showers and storms, but also potentially more humid. PWATs will increase back to the 1.7 to 1.9 inch range, but we'll still have ridging over us as well as light west to northwest flow. This will keep storms isolated and confined to areas along and south of I-10 during the day. We'll have to watch the East Coast for the evening hours near I-75. However, given limited and late initiation of storms, it will remain very hot as the ridge amplifies even more over the eastern US. More areas away from the coast look to climb to the upper 90s with a few spots potentially cracking 100. There may be slightly less potential to mix out our high dew points in the afternoon, so we will likely have another day of dangerous heat with widespread heat index values of 105-113. Heat Advisories will likely be needed for most of the area Monday afternoon.

This level of heat, including the limited overnight relief, is dangerous for anyone without hydration or access to air conditioning. Remember, if you're outdoors, drink plenty of water (even if not thirsty), take frequent breaks in air-conditioned spaces, wear light clothing, and consider rescheduling any strenuous activities to cooler parts of the day.

LONG TERM
(Monday Night through Saturday)
Issued at 318 AM EDT Sun Jun 28 2026

A shortwave trough will round the eastern periphery of the ridge with a weak surface trough moving into our area Monday evening.
We'll be at the tail end of this feature, and it is farther to the east than forecast over the last few days. Thus, while the MCS potential doesn't appear as high, we'll probably see scattered showers and storms move in from the northeast Monday evening, and move through the area through the night to the southwest. Some of these storms could still produce gusty winds.

By Tuesday, the weak surface trough sets up near the coast, effectively enhancing the sea breeze, which will be pinned to the coast with east to northeast winds. Thus, high rain chances are expected Tuesday afternoon and evening, but may get a later start than a normal summer day. So, we may end up with another very hot and humid day Tuesday with dangerous heat index values possible.

This feature weakens heading into the latter part of the week with rain chances decreasing as drier air moves in. This provides a short reprieve in the dangerous heat before temperatures and humidity increase yet again late in the week heading into the Independence Day weekend.

AVIATION
(06Z TAFS)
Issued at 126 AM EDT Sun Jun 28 2026

VFR conditions are expected with light west to southwest winds.

MARINE
Issued at 318 AM EDT Sun Jun 28 2026

Gentle westerly flow today becomes more northwesterly Monday and Tuesday. The sea breeze will turn winds more southwesterly each afternoon. By the middle of the week, winds turn more easterly as a trough of low pressure slips south of the marine area. Seas will be around 1-2 feet through the next several days. Isolated to scattered showers and storms are possible again beginning Monday night, mainly during the nighttime and morning hours.

FIRE WEATHER
Issued at 318 AM EDT Sun Jun 28 2026

Transport winds will mainly be out of the west to southwest around 10 mph today, turning more northeast and east by the middle of next week. Dispersions will be good each afternoon. Rain chances today are less than 10%. An increase in rain chances returns Monday afternoon and evening. Otherwise, increasing heat concerns are expected early this week with heat index values in the 100-110, possibly higher Monday.

HYDROLOGY
Issued at 318 AM EDT Sun Jun 28 2026

While scattered thunderstorms Monday and Tuesday could pose a locally heavy rain threat, widespread flood concerns are not expected over the next 7 days. Action stages continue on the lower Choctawhatchee and Ochlockonee basins. No additional river flooding is expected.

SPOTTER INFORMATION STATEMENT

Spotter activation is not requested. However, spotters are always encouraged to safely report significant weather conditions when they occur by calling the office or tweeting us @NWSTallahassee.

PRELIMINARY POINT TEMPS/POPS
Tallahassee 97 77 97 78 / 0 0 20 20 Panama City 92 78 93 79 / 0 0 10 30 Dothan 94 75 96 77 / 0 0 0 20 Albany 95 76 97 77 / 0 0 10 20 Valdosta 97 76 97 76 / 0 0 10 50 Cross City 97 77 99 77 / 10 10 20 20 Apalachicola 92 78 93 80 / 0 0 10 10

TAE WATCHES/WARNINGS/ADVISORIES
FL...Heat Advisory from 1 PM EDT /noon CDT/ this afternoon to 7 PM EDT /6 PM CDT/ this evening for FLZ014-015-027-112-114-115- 127-426.

GA...None.
AL...None.
GM...None.