Billings, Montana — An unseasonable surge of early-season heat will build across Montana starting Friday, May 8, pushing temperatures well above normal and increasing risks for travel and outdoor exposure across Billings, Great Falls, Missoula, Bozeman, and Helena.
According to NOAA’s Climate Prediction Center, temperatures will trend 65–75% above normal through May 14, with the most intense heat arriving Friday afternoon. The peak window runs from 2 p.m. to 7 p.m. Friday and Saturday, when valleys and plains are expected to warm rapidly under strengthening high pressure.
That heat will translate into noticeable impacts. Road surfaces along I-90 and I-15 may heat up significantly during peak afternoon hours, increasing stress on vehicles and raising the risk of tire issues on long rural stretches. In urban areas like Billings and Missoula, heat will build quickly on pavement, pushing surface temperatures higher than surrounding areas.
Limited overnight cooling will add to the strain, especially in lower elevations, where temperatures remain elevated after sunset and reduce recovery time from daytime heat. Outdoor workers and those without access to cooling may face increased exposure risk during back-to-back warm days.
Dry conditions combined with heat may also elevate fire risk across central and eastern Montana, particularly near Great Falls and Helena where grasses and brush can dry quickly.
This is part of a broader expansion of high pressure pushing unseasonable warmth across much of the western United States during this period.
Residents should limit outdoor activity during peak afternoon hours, stay hydrated, and avoid prolonged sun exposure. Drivers should check vehicles before extended travel and remain alert for heat-related issues on highways.
The highest risk for heat-related impacts will occur each afternoon between 2 p.m. and 7 p.m. Friday through Sunday.
