Glen Canyon National Recreation Area - Weather (U.S. National Park Service)

The high clouds of the summer monsoon season lend to amazing sunsets.

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The weather in Glen Canyon National Recreation Area is usually typical for the high deserts. Summers are extremely hot with little, if any, shade. Winters are moderately cold with night time lows often below freezing. Spring weather is highly variable and unpredictable with extended periods of winds. Fall weather is usually nice and mild, a great time to beat the heat (and the crowds!).
Temperatures can range from 110° F (38°C) in June & July to O° F (-16°C) in December & January. Precipitation is generally light (less than 6 inches--15.2cm-- annually) though heavy rains and flash flooding is possible during the summer and fall "monsoons."
We recommend lightweight, light colored clothing for summer, including a hat. Layers of clothing are best for other times of the year.

Temperatures	Average	Average	Rain/	Lake
Temperatures	High	Low	Snow	Surface
January	42F 6C	24F -4C	.47 in 1.2 cm	46F 8C
February	51F 11C	30F -1C	.43 in 1.1 cm	46F 8C
March	58F 14C	36F 2C	.73 in 1.9 cm	54F 12C
April	68F 20C	43F 6C	.34 in 0.9 cm	54F 12C
May	80F 27C	53F 12C	.43 in 1.1 cm	64F 18C
June	91F 33C	62F 17C	.20 in 0.5 cm	71F 22C
July	97F 36C	69F 21C	.47 in 1.2 cm	78F 26C
August	94F 34C	67F 19C	.67 in 1.7 cm	79F 26C
September	85F 29C	58F 14C	.54 in 1.4 cm	74F 23C
October	71F 22C	47F 8C	.78 in 2.0 cm	67F 19C
November	55F 13C	35F 2C	.59 in 1.5 cm	61F 16C
December	46F 8C	27F -3C	.51 in 1.3 cm	51F 11C