Islamorada — 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 at this location is slightly warmer than average for this day in previous years.

According to our forecast, Water temperature in Islamorada will be 25.5°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

Islamorada, located in the upper Florida Keys, enjoys subtropical marine conditions that keep surrounding waters relatively warm year-round. Seasonal sea surface temperatures typically range from about 20–24 °C in the winter months, rise to roughly 23–27 °C in spring, peak around 28–31 °C through the summer, and cool to approximately 26–29 °C during autumn. Short-lived cold fronts can occasionally push temperatures toward the low 20s °C in winter, while late summer and early fall usually bring the warmest and most stable water conditions. Water clarity is generally good, especially around the reefs and in the shallower backcountry, though weather and tides can affect visibility.