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

DISCUSSION
Issued at 250 PM EDT Fri Oct 16 2026

Rest of Today-Tonight...High moisture in light SE-E flow under weak high pressure is supporting isolated to widely scattered showers and lightning storms on the inland moving sea breeze.
Modest SW-S flow in the mid-levels is producing some training of heavy rainfall, as well as slow to nearly stationary movement of individual cells, which could result in locally high rainfall amounts of 2-4". Due to a combination of saturated soils and potential for heavy rainfall, most of East Central Florida remains outlook in a Marginal (level 1 of 4) risk for excessive rainfall leading to flash flooding. Only portions of Lake and Volusia counties to the north aren't included. Soundings show a typical late wet season profile, with a nearly saturated atmosphere, warm mid-levels, and modest instability. A couple storms that managed to find a more favorable environment have been observed early this afternoon, producing occasional lightning strikes, and other storms that manage to develop the rest of the afternoon and evening may produce more frequent lightning and wind gusts up to 45 mph. Activity will trend inland with the Atlantic breeze, colliding with the Gulf breeze over the interior in the evening.
This activity is forecast to wander back towards the east coast through the early overnight, generally dissipating or moving offshore after midnight. Mostly dry conditions through the rest of the night until the next front arrives Saturday morning.

Temperatures will be above normal, ranging from the upper 80s along the coast to upper 80s/low 90s inland. More humid conditions today will also produce peak heat index values around 98-102F.
Warm and muggy conditions continue overnight, with lows in the low to mid 70s.

Saturday-Thursday...Prolonged breezy to windy northeasterly flow will produce hazardous beach and marine conditions through much of the coming week. The pressure gradient tightens across the Florida peninsula Saturday between a cold front pushing through the area, high pressure building into the eastern US behind the front, and a disturbance developing on the front near the Atlantic seaboard. The front stalls over South Florida to the Straits of Florida Sunday, as the low pressure system becomes cut off over the western Atlantic waters off the eastern seaboard seaboard, and the high settles north and west of the front/low. These three features are forecast to move very little through at least the first half of next week, keeping the pressure gradient tight and continuing strong northeasterly flow. The greatest uncertainty in the forecast lies with position and strength of the developing low, which models are still waffling on, and has resulted in forecast winds coming down a little from the previous package.
However, this is just one model cycle, and NBM probabilities for gusts approaching Wind Advisory criteria along the coast remain moderate to high (40-70%) late Saturday into Sunday. Therefore will continue to message sustained wind speeds could reach 15-20 mph inland, up to 20-25 mph along the coast, with gusts 30-35 mph possible across much of the area the next several days. Gusts could push to 40 mph along the coastal corridor late Saturday through Sunday, and into Monday. The pressure gradient is forecast to loosen a little going toward mid-next week as the high weakens and the low drifts north, allowing winds to ease a bit, but conditions are forecast to remain breeze to windy. This extended period of fresh onshore flow will produce rough surf, large breaking waves, and a high risk of life-threatening rip currents.
Entering this dangerous water is highly discouraged! Long period onshore swells will also likely contribute to moderate beach erosion through multiple high tide cycles. High Surf Advisories, Rip Current Statements, and Coastal Flood Advisories will likely be needed in upcoming forecast packages.

As for rain chances, the prospect for lightning storms along and ahead of the front Saturday morning for the northern counties is decreasing, but can't be completely ruled out. Best chances remain in the southern counties (Treasure Coast to Okeechobee) where daytime heating will be able to destabilize before the front arrives. Overall rain chances Saturday reflect the storm chances, lower (20-40%) across the north, and higher (50-80%) across the south. Models have consistently signaled potential for multiple rounds of heavy showers and storms late Saturday into the overnight across the southernmost counties, mainly Martin, that could produce locally high rainfall amounts 2-4" leading to flooding, and 1 in 10 chance of amounts in excess of 6" producing flash flooding in one or two places, especially given how saturated soils are. There is a Slight (level 2 of 4) for excessive rainfall for coastal Martin into southern portions of coastal St. Lucie counties. Other convective hazards will include occasional to frequent lightning where storm manage to develop, and gusty winds to around 45 mph.

Drier air filters in behind the front Sunday knocking rain chances way down, though some moisture may linger across the south depending where the front settles. Despite the drier air, the fresh onshore flow is expected to whip up isolated to scattered low-top showers over the Atlantic waters, some of which may move onshore. The rest of the forecast generally continues low (20-30%)
rain chances along the coastal corridor, and very low (less than 20%) chances inland. More noticeable cooling behind this front, as high temperatures lower to U70s-M80s Saturday, then M70s-L80s Sunday, before gradually warming back up through the work week.
Lows drop to the 60s-L70s, reaching the U50s in the usually cooler northern areas, through much of the week.

MARINE
Issued at 250 PM EDT Fri Oct 16 2026

Rest of Today-Tonight...Generally favorable boating conditions continue through tonight before quickly deteriorating this weekend. Weak high pressure over the western Atlantic and the local area is ushered off eastward ahead of an approaching front and following deep high pressure. Light SSE-SE winds this morning have shifted more onshore from the sea breeze, but may become squirrelly at times, before shifting offshore late tonight as the front nears. Seas 2-3 ft. Isolated to scattered showers and lightning storms are forecast to develop near the coast and inland, then push offshore late this evening into tonight.

Saturday-Tuesday...Boating conditions rapidly become hazardous to dangerous Saturday, and are forecast to continue into next week.
The pressure gradient will tighten across Central Florida and the local Atlantic waters Saturday between a cold front pushing south and deep high pressure over the Eastern US, and is forecast to remain tight into the first half of next week as low pressure system develops off the eastern seaboard. Winds 20-30 kts with occasional to frequent gusts to gale force from the N-NE spread southward through Saturday behind the front, overspreading the waters by late Saturday into Sunday. Gale Watches for the Volusia and Space Coast waters have been upgraded to Gale Warnings for frequent gusts to gale force. Confidence the Treasure Coast waters will reach frequent gusts to gale has decreased this forecast package, and will continue with Small Craft Advisories for now, but upgrades to Gale Watch or Warning may be needed if future forecasts trend up. A strong NE breeze and occasional to frequent gusts to gale force are forecast to persist into at least Monday.
Seas also quickly build behind the wind surge to 5-10 ft north of Sebastian Inlet by Saturday evening, up to 10-15 ft Sunday evening. Winds and seas are forecast to settle a little towards mid-week, but remain at least Advisory level.

Repeated rounds of scattered to numerous showers and storms will continue into Saturday, especially across the southern waters. The strong onshore flow will be able to whip up isolated to scattered showers next week, but lightning storm chances very low.

AVIATION
(00Z TAFs)
Issued at 725 PM EDT Fri Oct 16 2026

Lingering VCTS/VCSH through 02Z at the terminals with winds becoming light and variable overnight. An approaching cold front early Saturday will lead to a return of VCSH as early as 09Z at LEE, expanding southeastward across the terminals through the remainder of Saturday. Winds strengthen out of the NNE, with sustained winds of 12-20 knots and gusts up to 26 knots possible at times, strongest along the coast. Persistent VCSH is anticipated across all terminals with lower confidence in VCTS, though it certainly cannot be ruled out. Too early for PROB30s/TEMPOs, but will continue to monitor closely and update as needed. Showers and any isolated storms will slowly diminish tomorrow evening, clearing out beyond 00Z across the Treasure Coast terminals.

PRELIMINARY POINT TEMPS/POPS
DAB 71 78 65 74 / 20 30 10 20 MCO 73 80 65 77 / 30 40 10 10 MLB 73 82 69 79 / 40 50 30 20 VRB 73 84 70 81 / 40 70 50 20 LEE 72 78 61 75 / 30 40 0 10 SFB 72 79 64 76 / 20 40 10 10 ORL 74 80 65 76 / 30 40 10 10 FPR 72 83 70 80 / 40 70 60 20

MLB WATCHES/WARNINGS/ADVISORIES
FL...None.
AM...Gale Warning from 11 AM Saturday to 2 AM EDT Monday for AMZ550- 570.

Gale Warning from 2 PM Saturday to 2 AM EDT Monday for AMZ552- 572.

Small Craft Advisory from 4 PM Saturday to 2 AM EDT Monday for AMZ555-575.