TUCSON, Ariz. — Officials say extreme heat will challenge firefighters battling a wildfire in the Santa Catalina Mountains overlooking Tucson.

High temperatures in the Tucson area are expected to range Thursday and Friday from 109 to 114, and fire management team spokesman Sandra Lopez says heat limits what firefighters can do and carry while restricting use of aircraft.

An expected weather change by Saturday is expected to help firefighters by increasing moisture and producing rainfall.

The fire has burned more than 38 square miles and its perimeter is 11 percent contained.

The summer-retreat community of Summerhaven atop Mount Lemmon remains evacuated.

Nearly 700 personnel are assigned to the fire, which started Friday. Its cause remains under investigation.

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