Moriches — 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 Moriches 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 Moriches will be 17.5°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

Moriches, located on the South Shore of Long Island in New York, sits where Moriches Bay meets the Atlantic, creating a mix of shallow bay waters and more open ocean conditions near inlets and barrier beaches. Water temperatures follow a clear seasonal pattern: winter months commonly see surface temperatures close to 0–5°C, with early spring gradually warming through roughly 5–15°C by late spring. Peak summer temperatures are typically in the 18–25°C range, with the warmest readings in July and August, while autumn sees a steady cooling back toward 10–20°C depending on weather and tidal exchange. Because the bay is relatively shallow, it tends to warm and cool faster than offshore waters, so localized temperatures can differ from those at ocean-facing beaches.