Long Neck — Water Temperature, Sea Conditions & Trends
This page provides clear and up-to-date information about water temperature for Long Neck (Delaware, 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 Long Neck help you plan your visit and choose the best time for swimming.
Current Water Temperature
Water temperature in Long Neck in the Atlantic Ocean today is 12°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 Long Neck 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 Long Neck will be 11.9°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 |
|---|---|---|---|
| APR 10 | 9.7°C | 10.3°C | |
| APR 11 | 9.8°C | 10.5°C | |
| APR 12 | 9.9°C | 10.3°C | |
| APR 13 | 10.2°C | 10.3°C | |
| APR 14 | 10.5°C | 10.3°C | |
| APR 15 | 10.5°C | 10.3°C | |
| APR 16 | 11.3°C | 10.3°C | |
| APR 17 | 11.4°C | 11.0°C | |
| APR 18 | 12.0°C | 11.0°C | 12.0°C |
| APR 19 | 10.8°C | 12.0°C | |
| APR 20 | 11.0°C | 12.0°C | |
| APR 21 | 11.3°C | 11.9°C | |
| APR 22 | 11.3°C | 11.9°C | |
| APR 23 | 11.5°C | 11.9°C | |
| APR 24 | 11.8°C | 11.9°C | |
| APR 25 | 12.0°C | 11.9°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
Long Neck is a residential and recreational peninsula on Delaware’s inland bays, situated where shallow estuarine waters meet the Atlantic coastal system. Because the area is dominated by tidal bays and protected waterways rather than the open ocean, water temperatures tend to warm and cool more quickly than offshore. Typical seasonal ranges run from roughly 0–6 °C in the coldest part of winter, rising through spring to about 6–15 °C as air temperatures moderate. In summer the bays commonly reach 20–26 °C, and in warm years shallow coves can briefly climb higher, while autumn sees a gradual decline from the low 20s °C down toward single figures as the season progresses. Actual temperatures vary with weather patterns, tides and exact location within the bay system.
Monthly Water Temperature Range (Min, Max & Average)
| Month | Min | Avg | Max |
|---|---|---|---|
| January | 1°C | 5°C | 10°C |
| February | 2°C | 4°C | 7°C |
| March | 3°C | 7°C | 10°C |
| April | 4°C | 10°C | 14°C |
| May | 8°C | 15°C | 20°C |
| June | 15°C | 20°C | 25°C |
| July | 19°C | 24°C | 28°C |
| August | 20°C | 25°C | 28°C |
| September | 18°C | 23°C | 27°C |
| October | 14°C | 20°C | 23°C |
| November | 8°C | 14°C | 18°C |
| December | 4°C | 9°C | 14°C |
* Click on a month to view detailed water temperature data.
Long Neck: Weather Forecast
April 19
April 20
April 21
Location, Beaches & Local Information
Nearby Beaches & Facilities
Lingo Inlet
Lingo Point
Holts Landing State Park
Nats Cove
Arrowhead Point
Rosedale Public Boat Ramp
Mallard Beach
Indian River Marina
South Indian River Inlet Beach
Swimming Conditions
Swimming and beach holidays around Long Neck are shaped by those sheltered bay conditions. The calm, shallow waters of the inland bays make for comfortable, often warmer swimming than the open ocean, extending pleasant bathing into late spring and early fall, and they are well suited to families, beginners, and activities such as wading and paddle sports. Public sandy ocean beaches with lifeguards are a short drive away for those seeking surf and wider shorelines, while local shorelines can include marshy or privately owned areas and small community beaches. Visitors should be aware of changing conditions — water quality advisories, occasional jellyfish or seaweed, and tidal currents near inlets — and check local guidance and lifeguard postings before entering the water.