Smith Mountain Lake is a popular spot for swimming, boating, and all sorts of water fun. But before you jump in, it’s good to know the water temperature!
Knowing the sml lake water temperature helps you decide if it’s warm enough for a comfortable swim or if you need a wetsuit. This page provides the latest water temperature readings, plus some historical data, so you can plan your lake day right.
What’s the water temperature at Smith Mountain Lake?
As of March 29th, 2025, the water at Smith Mountain Lake is cool. I would describe it as fresh!
Is it swimmable? Probably not for most people, unless you’re wearing a wetsuit.
These water temperature readings come from NOAA satellite data (sea surface temperature, or SST). Keep in mind that satellite readings aren’t always the same as live measurements. Local weather, the depth where the temperature is taken, and the time of day can all change the actual water temperature.
Seasonal Water Temperature Variations
Like any body of water, the water temperature of Smith Mountain Lake changes throughout the year. Here’s how the water temps tend to fluctuate with the seasons:
Warmest Months
August is when you’ll find the warmest water temps at Smith Mountain Lake. The average water temperature in August is around 79.3°F (26.3°C), making it the prime time for swimming, boating, and other water sports.
Coldest Months
If you’re looking for the chilliest dip, February’s your month. The average water temperature in February is around 47.1°F (8.4°C). Swimming is generally not recommended during this time unless you’re wearing thermal protection.
Monthly Averages
For more details on average maximum and minimum water temperatures for each month of the year, check out the chart below. All data is available in both Celsius and Fahrenheit.
Considerations for water activities
Before you jump in, always check the water temperature! It’s important for both safety and comfort. If the water feels cool, you might want to wear a wetsuit. A 4mm or 5mm wetsuit is usually a good choice for swimming in colder water.
Keep in mind that the water temperature isn’t the only thing that matters. Wind, air temperature, and how well you tolerate cold can all affect your experience. Be aware of the weather conditions, and listen to your body!
Frequently Asked Questions
What is the deepest lake in Virginia?
That would be Lake Drummond, nestled in the heart of the Great Dismal Swamp. It’s not known for swimming, though, and its maximum depth only reaches about 12 feet. Smith Mountain Lake gets way deeper!
What is the best temperature to swim in a lake?
Most people find lake water comfortable for swimming when it’s between 70°F and 80°F. Anything below 70°F might feel a little chilly, especially for extended periods. Above 80°F, it can feel a bit like bathwater, but some people enjoy it.
Is SML safe to swim in?
Generally, yes, Smith Mountain Lake is safe to swim in! The lake is monitored, and water quality is usually good. However, it’s always a good idea to be aware of any advisories or warnings issued by local authorities, especially after heavy rain, and to avoid swimming in areas with excessive algae blooms.
Is 60 degree lake water cold?
Yes, 60°F lake water is generally considered cold. While some people may be able to tolerate it for short periods, it’s cold enough to cause discomfort and potentially lead to hypothermia with prolonged exposure. Most swimmers would find it too cold for anything beyond a quick dip.
Putting It All Together
Knowing Smith Mountain Lake’s water temperature is essential for safe and enjoyable recreation. From its current temperature to its seasonal changes and safety implications, we’ve covered the key points.
Before you head out to SML, check the most up-to-date information, and have a fantastic time!