Bear Lake Water Temperature by Month

Bear Lake—straddling the Utah–Idaho border—is not only known for its striking turquoise waters and scenic beauty, but also for its popularity as a summer recreation hotspot. However, because it sits at an elevation of nearly 6,000 feet, its water temperatures can vary widely depending on the time of year. Whether you're planning to swim, boat, fish, or simply enjoy the shoreline, knowing the monthly water temperature can help you plan the perfect visit.

Here’s a month-by-month breakdown of Bear Lake’s water temperature and what conditions to expect throughout the year.

January: Frigid and Icy

In January, Bear Lake is at its coldest. Water temperatures typically hover around 34°F to 37°F (1°C to 3°C). Though the lake rarely freezes over completely due to its size and depth, near-shore areas can ice up. Recreational water activities are virtually non-existent this month, aside from limited ice fishing.

February: Still Frozen and Inhospitable

Bear Lake remains bitterly cold in February, with water temperatures remaining in the low 30s°F (0°C to 2°C). The cold air and snow-covered surroundings limit lake access. Most winter activities during this time take place around the lake, not in it.

March: The Ice Begins to Loosen

As spring begins, Bear Lake’s water temperatures show only slight warming, reaching about 36°F to 40°F (2°C to 4°C). The lake is still far too cold for any water recreation, though boaters may begin preparing for the coming months.

April: Signs of Thaw, But Still Cold

In April, the lake finally begins to thaw more completely. Water temperatures typically rise to around 42°F to 47°F (5°C to 8°C). While boating may begin on calmer days, swimming is still not advisable without proper thermal gear.

May: Early Recreation Season

May sees a gradual warming, especially by mid- to late month. Bear Lake water temperatures average between 50°F and 55°F (10°C to 13°C). Some brave paddleboarders, kayakers, and boaters begin venturing out, but swimming remains brisk and best done with a wetsuit.

June: Transition to Summer

June marks a more noticeable shift. Water temperatures generally reach 60°F to 68°F (15°C to 20°C) by the end of the month. This is when Bear Lake becomes more welcoming for recreation. Though still cool, it’s a popular time for boating, jet-skiing, and even quick dips for adventurous swimmers.

July: Peak Summer Warmth

In July, Bear Lake water reaches its most swimmable temperatures—often ranging between 68°F to 73°F (20°C to 23°C). This is the best month for swimming, tubing, wakeboarding, and all other water sports. On sunny afternoons, the water feels refreshingly cool and perfect for families.

August: Warmest Water of the Year

August continues the peak summer season with the lake’s warmest water temperatures of the year, typically between 70°F and 75°F (21°C to 24°C). Conditions are ideal for full-day swimming and beach outings. This is also the busiest time for tourists at Bear Lake.

September: Gradual Cooling Begins

In September, water temperatures begin to decline slowly but remain comfortable, especially early in the month. Expect temperatures from 65°F to 70°F (18°C to 21°C). The lake is still swimmable, though cooler evenings hint at the changing season.

October: Noticeably Cooler

By October, Bear Lake water cools significantly, falling to around 55°F to 60°F (13°C to 16°C). Water sports begin winding down, and most swimming ends unless you’re wearing cold-water gear. Boating and kayaking may still be pleasant on warmer days.

November: Cold Returns

Water temperatures drop quickly in November, typically falling to 45°F to 50°F (7°C to 10°C). Swimming is no longer viable, and the lake becomes quieter, with far fewer visitors. Snow may even begin accumulating in surrounding areas late in the month.

December: Winter Lockdown

By December, Bear Lake’s water temperature returns to near-freezing levels—33°F to 37°F (0.5°C to 3°C). Recreational water use ends completely. However, the lake and its snow-covered surroundings offer picturesque winter scenery for snowmobilers and nature lovers.

Quick Reference Table: Bear Lake Water Temperatures by Month

Month	Avg. Water Temp (°F)	Conditions for Recreation
January	34–37°F	Too cold – occasional ice fishing
February	33–36°F	Icy and inaccessible
March	36–40°F	Still too cold
April	42–47°F	Boating possible; no swimming
May	50–55°F	Cold but some recreation begins
June	60–68°F	Popular for boating; cool swimming
July	68–73°F	Ideal swimming season
August	70–75°F	Peak water temperature
September	65–70°F	Still pleasant for swimming
October	55–60°F	Cold for swimming; some boating
November	45–50°F	Too cold for most activities
December	33–37°F	Winter; no water recreation

Final Thoughts

Bear Lake's water temperature changes dramatically throughout the year, influenced by its high elevation, large surface area, and seasonal snowmelt. For those looking to enjoy swimming and water sports, July and August are the best months. For boaters and paddlers, June through September offers excellent conditions.

Whether you're planning a summer vacation or a scenic fall retreat, understanding Bear Lake's water temperature by month will help you make the most of your experience at this beautiful alpine destination.