Potomac River — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in the Potomac River, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in the Potomac River today is 40°F.
Water Temperature: Daily Trends, Historical Records, and Forecast
❌ As of today, the minimum water temperature ranges less than 41°F (5°C). Such water is extremely cold and not recommended for swimming without proper preparation. In these conditions, the risk of hypothermia is very high, and prolonged exposure to the water can be hazardous to your health. If you decide to swim, it is important to have the appropriate gear, such as a wetsuit. Typically, only experienced swimmers or those who practice winter swimming venture into such waters. 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 |
|---|---|---|---|
| JAN 14 | 43°F | 41°F | |
| JAN 15 | 41°F | 41°F | |
| JAN 16 | 42°F | 41°F | |
| JAN 17 | 40°F | 41°F | |
| JAN 18 | 40°F | 41°F | |
| JAN 19 | 40°F | 41°F | |
| JAN 20 | 40°F | 41°F | |
| JAN 21 | 40°F | 41°F | |
| JAN 22 | 41°F | 40°F | |
| JAN 23 | 41°F | 40°F | |
| JAN 24 | 41°F | 40°F | |
| JAN 25 | 41°F | 40°F | |
| JAN 26 | 41°F | 40°F | |
| JAN 27 | 41°F | 40°F | |
| JAN 28 | 41°F | 40°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 | 34°F | 41°F | 48°F |
| February | 34°F | 41°F | 48°F |
| March | 37°F | 48°F | 59°F |
| April | 41°F | 50°F | 61°F |
| May | 46°F | 59°F | 72°F |
| June | 57°F | 65°F | 73°F |
| July | 63°F | 71°F | 79°F |
| August | 63°F | 70°F | 77°F |
| September | 52°F | 63°F | 73°F |
| October | 46°F | 58°F | 70°F |
| November | 37°F | 47°F | 61°F |
| December | 37°F | 40°F | 46°F |
Potomac River: Water Temperature by Location
Location & Local Information
Source North Branch
• location Fairfax Stone, Preston County, West Virginia
Mouth Chesapeake Bay
• location St. Mary's County, Maryland/Northumberland County, Virginia, United States
Length 405 mi (652 km)
The Potomac River, flowing through the U.S. states of Maryland, Virginia, and Washington, D.C., offers a variety of recreational activities, including swimming. Water temperatures in the river can fluctuate depending on the season, typically ranging from about 40°F (4°C) during the winter months to 70-80°F (21-27°C) in the summer, making it more comfortable for swimming as the weather warms up. While the Potomac is not as warm as some southern rivers, it still provides a refreshing dip for those who enjoy outdoor activities along the riverbanks.
Swimming in the Potomac River is popular in certain areas, particularly in recreational zones such as Theodore Roosevelt Island and near the Great Falls Park. These areas offer calmer stretches of the river where swimmers can safely enjoy the water. However, in other parts of the river, currents can be strong and the water may be murky, which can pose safety risks. Many people prefer to swim in designated areas or participate in water sports like kayaking and canoeing, where they can maintain better control of their experience. Despite these factors, the Potomac remains a beloved destination for water activities and provides a scenic backdrop for those looking to enjoy the outdoors.