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Delaware River

Delaware River Current Water Temperature and Forecast

On this page, you will find comprehensive information about the water temperature in Delaware River, including current readings, historical data and trends, monthly averages, as well as weather forecasts and upcoming temperature predictions. We find every spot where you can swim and tell you what the water temperature is there today and throughout the year.

Current Water Temperature in Delaware River

9.7°C

TODAY

8.3°C

YESTERDAY

9.4°C

A WEEK AGO

As of today, the minimum water temperature in the Delaware River ranges from 41°F (5°C) to 47°F (8°C). This water temperature is still quite low, and swimming in such conditions may only be comfortable for hardened individuals. It is recommended to limit the time spent in the water to avoid hypothermia. For those not accustomed to cold water, it is better to refrain from swimming. However, if you decide to enter the water, it is advisable to wear a warm wetsuit for protection against the cold.

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.

Analysis, Historical Data, and Forecast of Water Temperature

Water Temperature Chart for Delaware River Over the Last 30 Days

Today the water temperature in Delaware River is lower than the same day in previous years. The water temperature range here in April is from 5°C to 16°C. The water temperature is trending upward, and it has increased both over the past 30 days and the past week.

The forecasted water temperature values for Delaware River are presented in the table below.

The actual water temperature values near the shore may differ by a few degrees from the stated values. For the development of the forecast, we use our own mathematical model that takes into account the current water temperature changes, historical data, and key weather trends, including wind strength and direction, and air temperature in each specific region.

Daily Water Temperature Chart

Date	Current	Average	Forecast
Apr 11	9.4°C	9.9°C
Apr 12	9.3°C	9.9°C
Apr 13	9.2°C	9.9°C
Apr 14	8.5°C	9.9°C
Apr 15	8.5°C	9.9°C
Apr 16	8.4°C	9.9°C
Apr 17	8.3°C	9.9°C
Apr 18	9.7°C	9.9°C
Apr 19		9.9°C	9.7°C
Apr 20		9.9°C	9.7°C
Apr 21		9.9°C	9.7°C
Apr 22		9.9°C	9.7°C
Apr 23		9.9°C	9.7°C
Apr 24		9.9°C	9.7°C
Apr 25		9.9°C	9.7°C
Apr 26		9.9°C	9.7°C

* Current - Actual water temperature value

** Average - Average water temperature on this day in recent years

*** Forecast - Our water temperature forecast

Water Temperature Ranges in Delaware River by Month

January

Minimum	Average	Maximum
1°C	5°C	9°C

February

Minimum	Average	Maximum
1°C	5°C	9°C

March

Minimum	Average	Maximum
3°C	6.7°C	11°C

April

Minimum	Average	Maximum
5°C	9.9°C	16°C

May

Minimum	Average	Maximum
8°C	13.4°C	21°C

June

Minimum	Average	Maximum
14°C	18.5°C	22°C

July

Minimum	Average	Maximum
17°C	20°C	24°C

August

Minimum	Average	Maximum
17°C	21.4°C	23°C

September

Minimum	Average	Maximum
11°C	17.6°C	19°C

October

Minimum	Average	Maximum
8°C	13.3°C	16°C

November

Minimum	Average	Maximum
3°C	8.1°C	16°C

December

Minimum	Average	Maximum
3°C	4.7°C	8°C

Monthly Water Temperature Histogram for Delaware River

Water Temperature in Cities and Towns on Delaware River

Wilmington

United States (Delaware)

11.7°C

Dover

United States (Delaware)

13.3°C

New Hope

United States (Pennsylvania)

9.1°C

Stroudsburg

United States (Pennsylvania)

8.9°C

Port Jervis

United States (New York)

8.8°C

Philadelphia

United States (Pennsylvania)

10.8°C

Deposit

United States (New York)

8.3°C

Margaretville

United States (New York)

6.4°C

Callicoon

United States (New York)

7.9°C

Delhi

United States (New York)

7.7°C

Lackawaxen

United States (Pennsylvania)

8.3°C

Trenton

United States (New Jersey)

9.3°C

Camden

United States (New Jersey)

11.5°C

Salem

United States (New Jersey)

11.0°C

Chester

United States (Pennsylvania)

11.3°C

Easton

United States (Pennsylvania)

10.4°C

Delaware River Weather

APRIL 18

1°C / 17°C

overcast

rain: 9% | wind: 13 km/h

APRIL 19

9°C / 26°C

overcast

rain: 22% | wind: 23 km/h

APRIL 20

8°C / 22°C

overcast

rain: 16% | wind: 22 km/h

APRIL 21

3°C / 14°C

overcast

rain: 11% | wind: 10 km/h

Water Temperature in Delaware River: General Trends and Swimming Opportunities

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.

Geographical Location of Delaware River

Nearby Rivers

Frequently Asked Questions About Delaware River and its Water Temperatures

What is the current water temperature in Delaware River?

The water temperature today in Delaware River ranges from 44°F (6.4°C) to 56°F (13.3°C).

What is the water temperature in Delaware River during the summer months?

The average water temperature in Delaware River during the summer months is typically between 65°F to 71°F (19°C to 21°C), and it can reach up to 75°F (24°C) at its warmest. However, in some years, the temperature may exceed this range.

What is the water temperature in Delaware River in May?

The average water temperature in Delaware River in May ranges from 46°F to 70°F (8°C to 21°C).

What is the water temperature in Delaware River in September?

The average water temperature in Delaware River in September is typically between 52°F to 66°F (11°C to 19°C).

Where does Delaware River flow?

Delaware River flows through United States (New York, New Jersey, Pennsylvania, Delaware, Maryland).

Is it possible to swim in the Delaware River?

Yes, it is possible to swim in the Delaware River. However, caution is advised due to potential hazards such as strong currents and water quality issues.

What major cities are located on Delaware River?

Cities along the course of Delaware River include Camden (New Jersey), Philadelphia (Pennsylvania), Trenton (New Jersey), Wilmington (Delaware).