Fire Weather Outlook: Warming, Drying Pattern Returns to Pacific Northwest in Mid-October

Residents and firefighters across the Pacific Northwest should be aware of a developing fire weather pattern: a high-pressure ridge is expected to push warmth and dryness back into the region during the second week of October, potentially extending elevated fire conditions into what is normally a cooler, wetter autumn period.

National Context: Season Easing, But Not Over

The National Interagency Fire Center (NIFC) opened the October 1–12 outlook period at National Preparedness Level 2, down from Level 3 in the previous reporting period. This reflects a general easing of conditions nationally, with 57,339 fires and 8.56 million acres burned so far in 2026 — still well above the 10-year averages of 124% for fires and 142% for acreage, but with the pace of new starts slowing.

Split Forecast for the Northwest

The Pacific Northwest faces a two-phase outlook through mid-October:

Days 1–7: Dry But Cool

The first week of the period will be relatively quiet for fire weather. Moisture from Hurricane Polo is forecast to generate widespread precipitation across the Southwest and central Rockies, but the Pacific Northwest will remain largely dry. Temperatures will start below normal and winds will be mostly light — conditions that support ongoing suppression operations on residual hot spots within existing fire perimeters.

Days 8–14: The Ridge Builds

The second week presents a more concerning pattern. The Climate Prediction Center’s 6–10 and 8–14 day outlooks give better than 80% odds of above-normal temperatures across a large portion of the western United States, with below-normal precipitation favored from Washington and Oregon through Idaho, Nevada, Utah, Colorado, Montana, and Wyoming.

This ridge could drive afternoon relative humidity into the single digits across eastern Washington and Oregon, particularly when combined with downslope offshore wind events.

Why This Matters Now

Washington’s largest active fires — the Little Giant and Sinlahekin — still carry significant smoldering hot spots within their perimeters. A burst of warm, dry, and gusty weather could cause flare-ups in these areas, pushing fire back toward containment lines. The potential for new ignitions in ungrazed or unburned fuels also increases under such conditions.

Fire weather watches and red flag warnings are likely for portions of eastern Washington and Oregon if the ridge builds as forecast. Earlier this summer, the National Weather Service issued a rare Particularly Dangerous Situation (PDS) Red Flag Warning for parts of eastern Washington and Oregon including Spokane and Pendleton, with that event being associated with explosive fire growth on the Sinlahekin and other fires.