Alabama Coast
Mobile Water Temperature
Mobile Bay below the city, and one of America's great river deltas just above it.
That is about 7°F warmer than average for this time of year, and cooling over the last two weeks. The October average here is 77°F.
Updated Sunday, October 4 — sea-surface temperature modeled for Mobile by Open-Meteo.
Out in the open Gulf, NOAA buoy 42012 — 53 miles offshore — is reading 85°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.
Mobile 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 | 55°F | 47–62°F | Cold |
| February | 59°F | 53–69°F | Cold |
| March | 66°F | 59–74°F | Bracing |
| April | 72°F | 66–81°F | Cool but comfortable |
| May | 81°F | 72–86°F | Warm |
| June | 87°F | 82–91°F | Very warm |
| July | 90°F | 89–93°F | Bath water |
| August | 91°F | 87–94°F | Bath water |
| September | 86°F | 81–91°F | Very warm |
| Octobernow | 77°F | 71–84°F | Warm |
| November | 69°F | 62–76°F | Cool but comfortable |
| December | 59°F | 53–64°F | Cold |
Warmest on average in August at 91°F; coolest in January at 55°F.
The water at Mobile
Two very different waters meet at Mobile. South of the city, the bay runs wide, shallow and brackish, holding speckled trout, white trout, redfish and flounder along its shorelines, reefs and channel edges. North of it lies the Mobile-Tensaw Delta, one of the largest river deltas in the country — a vast maze of bayou, cypress and marsh where paddlers, birders and bass and bream anglers spend far more time than the saltwater crowd. Because the two systems overlap, the salt line slides with river flow: a wet spring pushes trout south and carries freshwater fish down into water that was brackish a month earlier. Heat and afternoon storms set the daily schedule from June into September.
Mobile Bay & the delta
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 Mobile; 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 Mobile right now?
- The water at Mobile is currently about 84°F (29°C). The October average here is 77°F.
- Is the water warm enough to swim at Mobile in October?
- October averages 77°F at Mobile, which most people would call warm. About as good as it gets — warm enough to stay in for hours without getting chilled.
- When is the water warmest at Mobile?
- August is the warmest month on average at 91°F, and January the coolest at 55°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.