Stock Island — Water Temperature, Sea Conditions & Trends

Water Temperature: Daily Trends, Historical Records, and Forecast

✅ As of today, the minimum water temperature ranges from 79°F (26°C) to 82°F (28°C). This is very warm water, allowing for extended stays without any discomfort. Swimming in these conditions will be particularly enjoyable, making it the ideal temperature range for those who want to relax in the sea. Additionally, water in this temperature range is suitable for children and elderly people, as it is comfortable for prolonged stays.

It is important to note that these swimming tips and recommendations apply only in good weather. When the air temperature is below 68°F (20°C), and sometimes even below 77°F (25°C), swimming can be unpleasant even with relatively high water temperatures.

Water Temperature Chart Over the Last 30 Days

Currently, the sea water temperature at this location matches the average for this day in previous years.

According to our forecast, Water temperature in Stock Island will be 26.3°C in the next 7 days. See the table below for daily data for the upcoming week.

Table of Daily Sea Temperature Data

Annual Water Temperature Overview by Month

Monthly Water Temp Ranges

30°C

25°C

20°C

15°C

10°c

5°C

0°C

Annual Water Temperature Trend

Stock Island, a small island adjacent to Key West in the lower Florida Keys, sits in subtropical waters that remain relatively warm year-round. Sea temperatures around Stock Island typically range from about 23–25 °C in the coolest winter months to roughly 28–31 °C during the peak of summer. Spring sees a steady rise with waters commonly between 24–27 °C, while autumn temperatures usually linger in the mid-to-high 20s °C as the ocean slowly cools. Local conditions can vary with winds, tides and weather systems, and shallow bays and channels around the island can warm or cool slightly faster than open-ocean readings, but overall the surrounding waters are milder compared with most continental U.S. coastal areas.