New London — Water Temperature, Sea Conditions & Trends
This page provides clear and up-to-date information about water temperature for New London (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 New London help you plan your visit and choose the best time for swimming.
Current Water Temperature
Water temperature in New London in the Atlantic Ocean today is 15°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
⚠️ As of today, the minimum water temperature ranges from 54°F (12°C) to 60°F (15°C). The water is significantly warmer, and swimming becomes possible for most people. However, caution may still be required for prolonged stays in the water, as extended exposure can cause discomfort. This is a suitable temperature range for short swims and for those accustomed to cooler water. For more comfortable swimming, it is recommended to use proper gear.
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 New London 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 New London will be 16.0°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 |
|---|---|---|---|
| JUN 1 | 12.9°C | 13.0°C | |
| JUN 2 | 12.9°C | 12.8°C | |
| JUN 3 | 12.6°C | 13.5°C | |
| JUN 4 | 12.4°C | 13.5°C | |
| JUN 5 | 12.5°C | 14.3°C | |
| JUN 6 | 13.2°C | 15.0°C | |
| JUN 7 | 13.7°C | 15.5°C | |
| JUN 8 | 14.4°C | 15.0°C | |
| JUN 9 | 14.6°C | 15.0°C | 14.6°C |
| JUN 10 | 15.5°C | 14.8°C | |
| JUN 11 | 15.3°C | 15.0°C | |
| JUN 12 | 15.8°C | 15.2°C | |
| JUN 13 | 16.3°C | 15.4°C | |
| JUN 14 | 16.3°C | 15.6°C | |
| JUN 15 | 16.5°C | 15.8°C | |
| JUN 16 | 16.8°C | 16.0°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
New London sits at the mouth of the Thames River where it opens into Long Island Sound, and the water temperatures there reflect the mixed influence of coastal tidal waters and the shallower, semi-enclosed Sound. Seasonal surface temperatures typically range from around 0–4°C in winter, gradually warming through spring to roughly 4–12°C, and peaking in midsummer with averages around 18–23°C in July and August. Early autumn usually brings a steady cooling to about 10–18°C by September and October. Local conditions such as wind, fresh-water inflow from the river, and recent weather can shift these values, and shallow bays or sheltered pockets tend to warm faster than exposed shorelines.
Monthly Water Temperature Range (Min, Max & Average)
| Month | Min | Avg | Max |
|---|---|---|---|
| January | 2°C | 6°C | 9°C |
| February | 2°C | 4°C | 7°C |
| March | 2°C | 5°C | 7°C |
| April | 2°C | 8°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 | 19°C | 22°C | 26°C |
| September | 18°C | 20°C | 24°C |
| October | 13°C | 18°C | 21°C |
| November | 9°C | 13°C | 16°C |
| December | 5°C | 8°C | 12°C |
* Click on a month to view detailed water temperature data.
New London: Weather Forecast
June 10
June 11
June 12
Location, Beaches & Local Information
Nearby Beaches & Facilities
Green Harbor Beach
Ocean Beach Park
Eastern Point Beach
Waterford Beach Park
Mccook Point Beach
Mccook Point Park
Mccook's Beach
Hole In The Wall Beach
Esker Point Beach
Swimming Conditions
Swimming and beach holidays in New London are concentrated around public spots like Ocean Beach Park and nearby shoreline areas, where lifeguarded swimming zones and shore amenities are most common during the summer season. The warmest and most comfortable swimming is usually confined to July and August when surface temperatures are highest; swimmers in May, early June, or September often find the water cool and may prefer wetsuits or limited swims. Tidal currents, wind-driven waves, and occasional boat traffic are factors to consider when choosing a spot, so checking local advisories and water-quality reports is advisable. Beyond straight swimming, the coastal setting supports paddling, snorkeling in calmer coves, and typical beach-park facilities that make New London suitable for a seasonal seaside visit when temperatures and services are at their summer peak.