Niantic — Water Temperature, Sea Conditions & Trends
This page provides clear and up-to-date information about water temperature for Niantic (Connecticut, United States). It includes the current water temperature, daily data for the last month presented in a simple chart, and a 7-day forecast. The page also compares today’s value with typical averages for this period, shows usual monthly ranges during the year, and lists nearby beaches with short descriptions. Local weather for the next few days and general details about Niantic help you plan your visit and choose the best time for swimming.
Current Water Temperature
Water temperature in Niantic in the Atlantic Ocean today is 23°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
✅ As of today, the minimum water temperature ranges from 75°F (23°C) to 79°F (26°C). This is a very comfortable temperature for swimming, and many people can enjoy prolonged stays in the water without feeling cold. The water is pleasantly warm, making it ideal for relaxation and water sports. This temperature range is particularly popular among tourists, as it combines comfort and safety for health.
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 Niantic 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 Niantic will be 22.7°C in the next 7 days. See the table below for daily data for the upcoming week.
Table of Daily Sea Temperature Data
| Date | Current | Average | Forecast |
|---|---|---|---|
| AUG 4 | 21.4°C | 21.3°C | |
| AUG 5 | 21.5°C | 21.5°C | |
| AUG 6 | 21.9°C | 21.5°C | |
| AUG 7 | 22.0°C | 21.8°C | |
| AUG 8 | 22.2°C | 21.5°C | |
| AUG 9 | 23.7°C | 22.3°C | |
| AUG 10 | 23.7°C | 22.5°C | |
| AUG 11 | 23.6°C | 22.3°C | |
| AUG 12 | 23.0°C | 22.3°C | 23.0°C |
| AUG 13 | 22.5°C | 23.0°C | |
| AUG 14 | 22.5°C | 22.9°C | |
| AUG 15 | 23.0°C | 22.9°C | |
| AUG 16 | 23.0°C | 22.8°C | |
| AUG 17 | 23.0°C | 22.8°C | |
| AUG 18 | 23.0°C | 22.7°C | |
| AUG 19 | 23.0°C | 22.7°C |
* Current - Actual water temperature value
** Average - Average water temperature on this day in recent years
*** Forecast - Our water temperature forecast
Actual nearshore water temperatures may fluctuate by several degrees from the reported values, especially following heavy rainfall or extended periods of strong winds. Certain wind patterns can cause colder, deeper waters to rise and replace the sun-warmed surface water, leading to noticeable variations.
Our forecast is based on a proprietary mathematical model that considers real-time water temperature changes, historical trends, key weather patterns, wind strength and direction, and air temperature specific to each region. Additionally, we incorporate data from other resorts to enhance accuracy.
Water temperature data for this location is gathered from various sources, including buoys and satellite sea and ocean surface maps provided by the NOAA agency. We also incorporate data from local authorities in each specific location worldwide to ensure more accurate temperature readings.
Annual Water Temperature Overview by Month
Monthly Water Temp Ranges
Annual Water Temperature Trend
Niantic sits on the northern shore of Long Island Sound in southeastern Connecticut, giving it a classic New England coastal climate and water regime. Sea surface temperatures follow the seasonal cycle of the Sound: in winter the water typically drops to around 0–5°C, in spring it gradually warms to about 5–15°C, by summer peak temperatures commonly reach 18–24°C, and in autumn it cools again to roughly 8–18°C. These figures fluctuate yearly with weather patterns, freshwater inflow and tidal mixing, so short-term conditions can vary from the seasonal averages. Shallow bays and sheltered coves near the shore sometimes warm or cool a bit faster than the open sound, while deeper channels remain cooler.
Monthly Water Temperature Range (Min, Max & Average)
| Month | Min | Avg | Max |
|---|---|---|---|
| January | 2°C | 5°C | 9°C |
| February | 2°C | 4°C | 7°C |
| March | 2°C | 5°C | 7°C |
| April | 3°C | 7°C | 12°C |
| May | 8°C | 12°C | 17°C |
| June | 12°C | 17°C | 23°C |
| July | 17°C | 22°C | 25°C |
| August | 20°C | 22°C | 26°C |
| September | 17°C | 21°C | 24°C |
| October | 13°C | 18°C | 21°C |
| November | 8°C | 13°C | 17°C |
| December | 5°C | 8°C | 12°C |
* Click on a month to view detailed water temperature data.
Niantic: Weather Forecast
August 13
August 14
August 15
August 16
Location, Beaches & Local Information
Nearby Beaches & Facilities
Hole In The Wall Beach
Mccook's Beach
Mccook Point Park
Mccook Point Beach
Big Rocks
Attawan Beach
Giants Neck Beach
Rocky Neck State Beach
Rocky Neck State Park Bathing Beach
Swimming Conditions
Swimming and beach holidays in Niantic are oriented toward summer use when water temperatures are most comfortable, particularly July through September when many visitors find the water pleasant for bathing and water sports. The town and nearby state park beaches offer sandy shores, a promenade, and facilities that support family outings, though lifeguard coverage and amenities are seasonal. Outside the warmest weeks, swimmers often notice brisk water and may prefer shorter dips, wetsuits, or shoreline activities instead. Tidal currents and wind-driven chop can affect surf and comfort, so checking local conditions and any water-quality advisories before entering is advisable. Overall, Niantic provides a traditional New England beach experience with its best swimming opportunities concentrated in the warmer summer months when water temperatures are highest.