Firefighters are working 16-hour shifts as they battle the Spokane Complex Fire

The Old Trails and Autumn Lane fires were each 13% contained Wednesday, and the Fairview fire was 5% contained, according to fire officials.

SPOKANE, Wash. — Hundreds of firefighters are working long shifts to slow the Spokane Complex Fire ahead of hotter and drier conditions this weekend.

More than 1,500 firefighters from two dozen states are battling the conflagration, which has damaged or destroyed nearly 850 structures since it ignited Saturday.

Temperatures were expected to climb from the 80s the last two days into the upper 90s later this week with no rain on the horizon.

Still, “tremendous progress” has been made, said Tom Stokesberry, spokesman for the California Interagency Incident Management Team that is coordinating the multiagency response.

A utility worker views a burned property during the Old Trails Fire in Spokane, Wash., on Tuesday.Josh Edelson / AFP via Getty ImagesThe fire has grown by only 2 acres since Monday, and fire lines are being established on the three fires that make up the Spokane Complex. About 67,000 people have been displaced, officials said, adding that the number could climb.