Lemon Bay & Charlotte Harbor
Placida · Gasparilla Sound Water Temperature
Gasparilla Sound, the Placida trestle, and Charlotte Harbor.
That is right about average for this time of year, and cooling over the last two weeks. The September average here is 87°F.
Updated Monday, September 21 — sea-surface temperature modeled for Placida · Gasparilla Sound by Open-Meteo.
Out in the open Gulf, NOAA buoy 42013 — 47 miles offshore — is reading 87°F. Deep water offshore runs cooler than the shallows in summer and warmer in winter, so it won't match the beach.
For swimming
Very warm
Bath-warm. Pleasant, though it stops being much relief from the heat of the day.
For fishing
Hot — fish the edges of the day
Early and late is the play. Through the middle of the day fish drop into deeper channels and passes where there's moving water and more oxygen.
The last two weeks
Daily average sea-surface temperature, °F.
Placida · Gasparilla Sound water temperature by month
Averaged from 3 years of daily sea-surface temperature (2023–2025). The range column is the coolest and warmest daily average recorded in that month over the period — a guide to how much any given year can differ, not a record high and low.
| Month | Average | Range | Swimming |
|---|---|---|---|
| January | 65°F | 60–70°F | Bracing |
| February | 69°F | 63–74°F | Cool but comfortable |
| March | 73°F | 68–77°F | Cool but comfortable |
| April | 77°F | 74–81°F | Warm |
| May | 83°F | 78–88°F | Very warm |
| June | 86°F | 82–88°F | Very warm |
| July | 89°F | 86–90°F | Bath water |
| August | 89°F | 85–91°F | Bath water |
| Septembernow | 87°F | 84–89°F | Very warm |
| October | 81°F | 77–86°F | Warm |
| November | 75°F | 71–79°F | Warm |
| December | 69°F | 65–73°F | Cool but comfortable |
Warmest on average in July at 89°F; coolest in January at 65°F.
The water at Placida · Gasparilla Sound
Placida sits on Gasparilla Sound at the top of the Boca Grande fishery, where the old Placida trestle and railroad pilings hold snook, mangrove snapper, and sheepshead. The surrounding flats and creeks give up redfish and some genuinely big trout, and it's the jumping-off point for the tarpon grounds a short run south. Structure and moving water are the recurring themes.
Gasparilla Sound
What moves the water temperature here
The Gulf shelf off this coast is shallow, which is why the water swings so much more between summer and winter than open ocean at the same latitude does. Shallow water heats fast and gives that heat up fast: a single strong winter cold front can pull the inshore bays several degrees down in a couple of days, while the beaches a mile offshore barely move. Wind direction matters too — a sustained offshore breeze can pull cooler water up from below and drop the beach temperature noticeably in a morning.
Inshore bays, canals and flats run warmer than the beach through the summer and colder through the winter, for the same reason. The reading above is for the open water at Placida · Gasparilla Sound; expect the back bays to be a few degrees either side of it depending on the season.
Common questions
- What is the water temperature at Placida · Gasparilla Sound right now?
- The water at Placida · Gasparilla Sound is currently about 87°F (31°C). The September average here is 87°F.
- Is the water warm enough to swim at Placida · Gasparilla Sound in September?
- September averages 87°F at Placida · Gasparilla Sound, which most people would call very warm. Bath-warm. Pleasant, though it stops being much relief from the heat of the day.
- When is the water warmest at Placida · Gasparilla Sound?
- July is the warmest month on average at 89°F, and January the coolest at 65°F. 8 months of the year average 75°F or above.
- Why does the water temperature change so quickly here?
- The Gulf shelf off this coast is shallow, so it heats and cools far faster than deep open ocean. A strong winter cold front can pull the inshore water down several degrees in a couple of days, and a sustained offshore wind can drop beach temperatures in a single morning by pulling cooler water up from below.