Lake Powell Water Temperature by Month

Lake Powell’s water warms slowly through spring, peaks around 80 degrees in August and cools again through fall. The table below shows average surface water temperatures by month along with typical air highs and lows, so you can plan the right time to swim, wakeboard or ride.

Average Water and Air Temperature by Month

Water temperatures are long-term averages for the surface of the lake. Any given week can run several degrees warmer or cooler.

When Is Lake Powell Warm Enough to Swim?

For most people, swimming is comfortable once the water reaches the low 70s, which usually means mid-June through September. July, August and early September have the warmest water, often in the upper 70s to around 80 degrees. Late May and October are fine for quick dips on a hot day. From November through April the water is cold enough to take your breath away, so stay dry unless you have a wetsuit.

Why the Water Temperature Varies

• Depth: only the top few feet warm up in summer. Jump in and the water a few feet down can feel much colder.
• Location: shallow bays and the backs of canyons warm first. Deep water in the main channel and near the dam stays cooler.
• Time of day: the surface is warmest in the late afternoon after a sunny day.
• Wind: strong wind mixes cooler water up from below.

What to Wear on a Jet Ski or Boat

• Summer: swimsuit, a sun shirt, hat and sunglasses with a strap. Water shoes protect your feet on hot sand and sharp rock.
• Spring and fall: a wetsuit or splash jacket keeps you warm when spray hits at speed. Bring a towel and a dry layer.
• Winter: waterproof layers, gloves and a warm hat. Ride slower, since wind chill on the water is much colder than the air on shore.
• Always: a life jacket. Everyone on a jet ski and anyone being towed must wear one, and every rental from us includes a life jacket for each rider.

Cold Water Safety

Water in the 40s and 50s can cause cold shock: a gasp reflex and fast breathing that make swimming hard in the first minute. Wear your life jacket, keep the safety lanyard clipped to the driver, and if you fall in, float and catch your breath before you try to climb back on. Ride with a partner when the water is cold.

Plan Your Trip

For warm water with fewer crowds, aim for early June or September. See the best time to visit Lake Powell for seasons, wind and storms, and check Lake Powell water levels before you go.