Bear Lake Water Temperature

Bear Lake, straddling the border between northern Utah and southeastern Idaho, is famous for its vibrant turquoise water, scenic beauty, and summer recreation. One of the most frequently asked questions by visitors planning water activities is: What is the water temperature of Bear Lake? Understanding the lake’s seasonal water temperature can help you plan better for swimming, boating, paddleboarding, or simply enjoying a day by the shore.

In this article, we explore Bear Lake’s water temperature trends month by month, factors that affect it, and what conditions you can expect during your visit.

Bear Lake Water Temperature Overview

Bear Lake sits at an elevation of approximately 5,924 feet (1,806 meters) above sea level. Due to this high elevation, the water stays cool for much of the year and only becomes comfortably warm during a short summer window. The lake is also quite large—over 109 square miles (282 square kilometers)—which means it takes time for the water to warm up in spring and cools gradually in fall.

In general:

◉ Winter and spring water temperatures range from near freezing to around 50°F (10°C).

◉ Summer temperatures peak between 68°F to 75°F (20°C to 24°C).

◉ Fall temperatures decline steadily back into the 50s (°F) or lower.

Monthly Breakdown of Bear Lake Water Temperature

1. January to March: Frigid Waters

In the heart of winter, Bear Lake’s water temperature hovers close to freezing. Though the lake rarely freezes completely due to its depth and volume, temperatures often stay between 32°F and 38°F (0°C to 3°C). Recreational water use is minimal during these months, but the shoreline may attract winter campers, ice fishers (in shallow areas), or snowmobilers on the adjacent terrain.

2. April and May: Still Chilly

As spring arrives, the snowmelt begins feeding into the lake, but the water remains cold. April sees temperatures in the 40s°F (4°C to 9°C), and by late May, it may reach the low 50s°F (10°C to 12°C). This is a popular time for boating and kayaking, but swimming is not advisable without a wetsuit.

3. June: Warming Up

June marks the transition to summer. With long sunny days and warmer air, the lake’s surface temperature usually rises to around 60°F to 68°F (15°C to 20°C) by the end of the month. Swimmers begin venturing in—especially during the latter half of June—though it can still feel refreshing or even brisk.

4. July and August: Peak Swimming Season

July and August are the warmest months for both air and water temperatures at Bear Lake. Water temperatures typically reach their annual peak during this time, ranging from 68°F to 75°F (20°C to 24°C). This is when the lake is most comfortable for swimming, paddleboarding, tubing, and other water sports. These months also coincide with the busiest tourist season.

5. September: Gradual Cooling

In early September, the water still holds much of its summer warmth, with temperatures staying in the mid-60s to low 70s°F (18°C to 22°C). As the month progresses and air temperatures fall, the lake starts cooling off quickly—especially at night.

6. October to December: Back to Cold

By October, Bear Lake’s water has usually dropped back to the 50s°F (10°C to 15°C), and by November and December, it descends into the 30s°F to low 40s°F (1°C to 6°C) range. Water sports essentially cease during this period, although fall visitors still enjoy the quiet scenery, wildlife, and lakeside hikes.

Factors That Influence Bear Lake’s Water Temperature

Several natural factors influence Bear Lake’s water temperature:

1. Elevation: At nearly 6,000 feet, cooler air temperatures limit how warm the water can get.

2. Size and Depth: Bear Lake is deep and expansive, which means it takes time to absorb and retain heat.

3. Seasonal Snowmelt: Spring and early summer snowmelt from the surrounding mountains brings cold runoff into the lake.

4. Wind Patterns: Winds can cause surface mixing, which may bring colder water from below to the top layers, particularly during sudden weather shifts.

5. Sunlight Exposure: Long, sunny days in midsummer significantly boost surface temperatures.

Swimming Tips Based on Temperature

Below 60°F (15°C): Too cold for most swimmers without a wetsuit; risk of cold shock.

60–68°F (15–20°C): Swimmable but still brisk—great for quick dips, especially on hot days.

68–75°F (20–24°C): Ideal range for most recreational swimmers and families.

Above 75°F (24°C): Rare at Bear Lake, but exceptionally warm and comfortable when it happens.

Final Thoughts: Know Before You Go

Bear Lake’s crystal-clear, turquoise waters are inviting year-round, but the best time for swimming and water sports is during the warm summer months of July and August. Even then, the water may feel cooler than lower-elevation lakes, so it’s important to check local water temperature forecasts before planning your activities.

Whether you’re paddling across its glassy surface or diving in for a refreshing swim, understanding Bear Lake’s water temperature patterns will help you make the most of your time at this alpine paradise.