The Siskiyou County sheriff tweeted the bodies were found in separate homes along the perimeter of the fire.
That brings the total number of deaths to four.
RELATED:At least 2 killed in massive McKinney Fire burning in California-Oregon border, officials say
2 killed in McKinney Fire burning near CA border, officials say
The fire is currently at 56,165 acres and 0% contained, officials said.
This is the largest wildfire in California this year.
The weather has been problematic for firefighters with gusty winds and thunderstorms.
VIDEO: Former Bay Area residents threatened by McKinney Fire near Oregon border
Massive McKinney Fire burning near CA border burns home, threatens thousands of others
However, rain has helped slow down the fire just a bit.
More than 2,000 people have been told to evacuate.
RELATED: McKinney Fire: SF hiker talks about being stranded on mountain trail as massive wildfire erupts
SF hiker talks about being stuck on trail near McKinney Fire
Two bodies were also found found Sunday inside a charred vehicle in the driveway of a home near the tiny unincorporated community of Klamath River, which sustained major damage in the McKinney Fire, sheriff's officials said.
More than 100 homes, sheds and other buildings have burned in the McKinney Fire since it erupted last Friday. Rain helped firefighters as they worked to control the spread of the fire, but the blaze remained out of control, authorities said.
The Northern California wildfire has burned nearly nearly 88 square miles (228 square kilometers), and is the largest of several wildfires burning in the Klamath National Forest. A smaller fire near the tiny community of Happy Camp forced evacuations and road closures as it burned out of control Tuesday. Still more fires are raging in the Western U.S., threatening thousands of homes.
The Associated Press contributed to this report.
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