Delaware River — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in the Delaware River, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in the Delaware River today is 60°F.
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
Table of Daily Sea Temperature Data
| Date | Current | Average | Forecast |
|---|---|---|---|
| MAY 10 | 58°F | 56°F | |
| MAY 11 | 58°F | 56°F | |
| MAY 12 | 57°F | 56°F | |
| MAY 13 | 57°F | 56°F | |
| MAY 14 | 56°F | 56°F | |
| MAY 15 | 57°F | 56°F | |
| MAY 16 | 58°F | 56°F | |
| MAY 17 | 60°F | 56°F | |
| MAY 18 | 56°F | 60°F | |
| MAY 19 | 56°F | 59°F | |
| MAY 20 | 56°F | 59°F | |
| MAY 21 | 56°F | 59°F | |
| MAY 22 | 56°F | 59°F | |
| MAY 23 | 56°F | 59°F | |
| MAY 24 | 56°F | 58°F |
* 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.
Monthly Water Temperature Range (Min, Max & Average)
| Month | Min | Avg | Max |
|---|---|---|---|
| January | 32°F | 41°F | 48°F |
| February | 32°F | 41°F | 48°F |
| March | 34°F | 43°F | 52°F |
| April | 41°F | 50°F | 61°F |
| May | 46°F | 56°F | 70°F |
| June | 57°F | 65°F | 72°F |
| July | 63°F | 68°F | 75°F |
| August | 63°F | 71°F | 73°F |
| September | 52°F | 62°F | 72°F |
| October | 46°F | 57°F | 68°F |
| November | 37°F | 47°F | 61°F |
| December | 34°F | 41°F | 46°F |
Delaware River: Water Temperature by Location
Delaware River: Weather Forecast
May 18
May 19
May 20
May 21
May 22
Location & Local Information
Source West Branch
• location Mount Jefferson, Town of Jefferson, Schoharie County, New York, United States
Mouth Delaware Bay
• location Delaware, United States
• elevation 0 ft (0 m)
Length 282 miles (454 km)
The Delaware River, stretching over 300 miles from New York to Delaware Bay, offers a diverse range of water temperatures throughout the year, influenced by seasonal changes and geographical location. In the upper sections of the river, closer to its mountainous origins, the water remains cooler, particularly during spring and early summer, with temperatures often ranging between 50°F and 65°F (10°C to 18°C). As the river flows southward and enters more temperate regions, summer water temperatures can climb to 70°F–80°F (21°C–27°C), making it more suitable for swimming and recreational activities.
Swimming in the Delaware River is popular, especially during the warmer months from late June to early September. However, the river’s suitability for swimming depends on local conditions such as water depth, flow rate, and safety advisories. Calm stretches, particularly around the Delaware Water Gap and areas managed by the National Park Service, are favored by swimmers and kayakers. It's important to note that while the water temperature may be comfortable in summer, checking for current conditions and safety guidelines is essential before diving in, as occasional strong currents or water quality concerns can arise.