Madison — Water Temperature, Sea Conditions & Trends

Water Temperature: Daily Trends, Historical Records, and Forecast

⚠️ As of today, the minimum water temperature ranges from 60°F (15°C) to 65°F (18°C). The water is comfortable for most people, making it an ideal range for water sports enthusiasts. The temperature does not cause significant discomfort, and swimming will be pleasant for the majority. However, it's important to remember that prolonged exposure to the water can still lead to cooling, so it's essential to monitor the time spent in the water, especially for children or elderly people.

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

Water temperature in Madison has risen over the last week and month. Currently, the sea water temperature at this location matches the average for this day in previous years.

According to our forecast, Water temperature in Madison will be 17.3°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

Madison, Connecticut, sits on the northern shore of Long Island Sound, so its coastal waters follow the seasonal patterns typical of the Sound. Winter sea temperatures commonly range from about 0 to 5 °C, rising through spring to roughly 5 to 15 °C. By summer, water temperatures nearshore are usually between 18 and 24 °C, with the warmest readings in July and August. In autumn the water cools again, generally settling in the 10 to 18 °C range before dropping back toward winter values. Local conditions can vary with wind, tides and freshwater runoff from rivers and marshes, so short-term fluctuations are normal.