District of Columbia — Water Temperature Today and Throughout the Year

Water Temperature in Lakes and Rivers

Popular Rivers

Popular Places

Water Temperature and Swimming Overview

Water Temperature Trends

In the District of Columbia, water temperatures in the Potomac River, which runs through the heart of the city, fluctuate significantly depending on the time of year and weather conditions. During the warmer months, from late spring to early fall, water temperatures in the Potomac typically range from 70°F to 80°F (21°C to 27°C). This is the period when many residents and tourists enjoy activities like kayaking, paddleboarding, and boating. These temperatures are generally comfortable for water activities, although the water can still feel cool, especially in the early morning or late evening.

In the winter months, water temperatures in the Potomac drop significantly. By January and February, the river temperature can fall to around 35°F to 40°F (1.5°C to 4.5°C), making any outdoor water activities extremely cold and potentially dangerous due to the risk of hypothermia. The river is also subject to occasional freezing during particularly cold winters, particularly in the more sheltered areas. These low temperatures limit recreational use, with most activities shifting to the colder months being land-based.

In the spring and fall, water temperatures in the Potomac are generally moderate, ranging between 50°F and 60°F (10°C to 15.5°C). This is a great time for fishing, especially for those targeting species like striped bass, which are commonly found in the river. The cooler temperatures make it more challenging for swimming, but they are still conducive for various types of water recreation, including boating and fishing. As temperatures vary based on rainfall, runoff, and seasonal changes, the Potomac River remains an essential natural resource for the District of Columbia, even as its temperature fluctuates throughout the year.