WALLA WALLA, Wash. — Another summer of record-breaking drought and heat has seized the West, setting off costly and destructive wildfires from Southern California, where a single blaze burned more than 30,000 acres of national forest east of Los Angeles, to Montana, where a fast-moving fire in Glacier National Park recently forced tourists to flee hotels, campgrounds and vehicles.

No measurable rain has fallen here in Walla Walla since May. Temperatures have broken decades-old records. And, though known for soaking skies and cool summers, Washington State is well on track to surpass last year’s wildfire season, its busiest on record.

Dozens of homes and thousands of acres have burned over the past few months — in the rain forests of the Olympic Peninsula, in suburban communities on the edge of the wild lands, and in this city of wheat farms and vineyards where hundreds of firefighters are still battling a blaze on the western slopes of the Blue Mountains, digging and scraping the earth, building barriers of dirt to shield the dried-out forests from the approaching flames.

“Our fire season started a month ahead, our crops matured weeks ahead and the dry weather we usually get in August, we’ve had since May,” said Peter J. Goldmark, Washington’s commissioner of public lands. Walking along the edge of the Blue Creek fire, burning near the Oregon-Washington border, he added, “By heavens, if this isn’t a sign of climate change, then what is climate change going to bring?”