The National Interagency Fire Center in Boise says a wet spring reduced the likelihood of wildfires during June over much of the nation, but the risk is above normal in drought-stricken California.
Hawaii and parts of the Southwest and Alaska are also at above-normal risk.
As the summer progresses, fire danger is expected to increase in the Northwest, Georgia and the Carolinas.
Agriculture Secretary Tom Vilsack and Interior Secretary Sally Jewell will discuss wildfire threats and the nationwide outlook for the wildfire season Tuesday in Denver.
They'll also discuss a proposal by Obama to change the way wildfire-fighting is funded to ease the strain on the U.S. Forest Service budget.
Vilsack and Jewell are warning that catastrophic wildfires pose a worsening danger, especially in the West.