Emerald Coast
Perdido Key Water Temperature
Perdido Pass, Old River, and the westernmost sand in Florida.
Sea-surface temperature
WarmHolding steady · last two weeks
That is about 4°F warmer than average for this time of year, and holding steady over the last two weeks. The November average here is 71°F.
Updated Saturday, November 7 — sea-surface temperature modeled for Perdido Key by Open-Meteo.
Out in the open Gulf, NOAA buoy 42012 — 18 miles offshore — is reading 77°F. Deep water offshore runs cooler than the shallows in summer and warmer in winter, so it won't match the beach.
For swimming
Warm
About as good as it gets — warm enough to stay in for hours without getting chilled.
For fishing
Peak season
Snook, redfish and tarpon are all active and feeding. The tarpon migration through the passes runs at the upper end of this range.
The last two weeks
| Date | Average |
|---|---|
| Oct 25 | 74.5°F |
| Oct 26 | 74.1°F |
| Oct 27 | 73.9°F |
| Oct 28 | 73.8°F |
| Oct 29 | 73.8°F |
| Oct 30 | 74.1°F |
| Oct 31 | 74.5°F |
| Nov 1 | 74.8°F |
| Nov 2 | 74.8°F |
| Nov 3 | 74.8°F |
| Nov 4 | 74.8°F |
| Nov 5 | 75.2°F |
| Nov 6 | 75.2°F |
| Nov 7 | 74.5°F |
Perdido Key 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 | Range | Average |
|---|---|---|
JanJanuary Bracing | 54–67°F | 60°F |
FebFebruary Bracing | 59–69°F | 62°F |
MarMarch Bracing | 62–73°F | 67°F |
AprApril Cool but comfortable | 67–78°F | 72°F |
MayMay Warm | 72–82°F | 79°F |
JunJune Very warm | 80–88°F | 84°F |
JulJuly Very warm | 85–88°F | 87°F |
AugAugust Bath water | 86–90°F | 88°F |
SepSeptember Very warm | 82–89°F | 85°F |
OctOctober Warm | 73–84°F | 78°F |
NovNovembernow Cool but comfortable | 65–77°F | 71°F |
DecDecember Bracing | 60–67°F | 64°F |
Warmest
88°FAugust
Coolest
60°FJanuary
Warmest on average in August at 88°F; coolest in January at 60°F.
The water at Perdido Key
Perdido Key is the last barrier island before Alabama, a thin strip of dazzling white quartz sand with the Gulf on one side and Old River and Big Lagoon on the other. Trout and redfish work the grass and dock lines inside, pompano and whiting run the surf trough, and the jetties at Perdido Pass concentrate everything that moves through. King mackerel and cobia show up on the nearshore reefs and wrecks in spring and fall.
the Gulf & Perdido Pass
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 Perdido Key; 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 Perdido Key right now?
- The water at Perdido Key is currently about 75°F (24°C). The November average here is 71°F.
- Is the water warm enough to swim at Perdido Key in November?
- November averages 71°F at Perdido Key, which most people would call cool but comfortable. Refreshing rather than cold — comfortable once you're past the first minute.
- When is the water warmest at Perdido Key?
- August is the warmest month on average at 88°F, and January the coolest at 60°F. 6 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.