Average Lake Mead Water Temperature
As measured at Sentinel Island in the Boulder Basin.
(Water temperatures are averaged based on data acquired from the National Geological Survey)

Month
15 feet
60 feet
90 feet
180 feet
January
55°
55°
55°
55°
February
53°
53°
53°
53°
March
54°
54°
53°
53°
April
60°
54°
53°
52°
May
65°
60°
56°
53°
June
76°
63°
58°
53°
July
81°
65°
60°
54°
August
84°
70°
61°
55°
September
80°
70°
65°
55°
October
80°
72°
64°
55°
November
65°
65°
65°
54°
December
61°
62°
61°
55°
 

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