Marine Weather and Tide Forecast for St. Augustine South, FL

SHORT TERM
(Wednesday through Thursday night)
Issued at 145 PM EDT Tue May 13 2025

Through mid week the pattern will transition with only a low chance of showers possible Wednesday evening as a shortwave ripple dives quickly through the area. Behind that feature, upper ridging will begin to overtake the area through Thursday. Light offshore flow will pin the Atlantic sea breeze closer to the beaches and delay the inland push. That will promote widespread highs in the low 90s by Thursday afternoon. Low temps each night are expected to fall to the low/mid 60s under mostly clear skies. As shallow moisture is replenished by the Gulf Wednesday afternoon, patchy inland fog development will become more likely, particularly near the I-75 corridor Thursday morning.

LONG TERM
(Friday through next Tuesday)
Issued at 145 PM EDT Tue May 13 2025

The region will be locked into a stagnant large scale pattern this weekend as high pressure stacks across the region. At this surface, a persistent ridge axis will lay to the south, across southern Florida, through the period, allowing a multi-day period of westerly flow. Increasing subsidence offered by the ridging along with reduced low/mid level moisture will curtail substantial rain chances.

Temperatures rise into the weekend peaking Saturday and Sunday as a frontal boundary stalls just to the north and local gradients are squeezed. Resultant increasing westerly winds will lead to deeper mixing and daily high temperatures that will challenge records topping out in the mid 90s. Given the offshore flow, the sea breeze will be pinned through the period and even the beaches will be quite hot each afternoon, with heat index readings potentially reaching triple digits.

AVIATION
(18Z TAFS)
Issued at 145 PM EDT Tue May 13 2025

Showers and storms continue through the afternoon hours, with showers affecting GNV and JAX during the first couple of hours of the TAF period. Variable winds during the heavier downpours. Activity will dwindle around 00Z/01Z, with winds becoming light. Some BR possible for the inland TAF sites during the early morning hours around 06Z to 09Z, clearing by 12Z.



MARINE
Issued at 145 PM EDT Tue May 13 2025

Dry air begins to filter in as the cold front continues to move further out into the Atlantic, helping to clear out much of the convective activity out over the water. However, a few showers will still be possible in the afternoon hours as a weak trough moves through the the area. Chances for rain and possibly a few isolated storms will generally stay below 30% and drop below 10-15% after sunset. Weak high pressure will then settle over the area to the end of the week with prevailing winds from the south to southwest.

Rip Currents: Lingering elevated swells will continue high risk of rip currents for NE FL beaches through this evening. Moderate risk prevails elsewhere.

PRELIMINARY POINT TEMPS/POPS
AMG 63 87 65 91 / 10 10 0 0 SSI 68 84 69 89 / 10 10 10 0 JAX 64 90 66 94 / 0 10 0 0 SGJ 66 89 67 91 / 0 10 0 0 GNV 64 89 64 92 / 0 10 0 0 OCF 65 88 65 91 / 0 0 0 0

JAX WATCHES/WARNINGS/ADVISORIES
FL...High Rip Current Risk through late tonight for FLZ124-125-138- 233-333.

GA...None.
AM...None.