Cheyenne, Wyoming — An unseasonable surge of early-season heat will build across Wyoming starting Friday, May 8, pushing temperatures well above normal and increasing risks for travel and outdoor exposure across Cheyenne, Casper, Laramie, Gillette, and Rock Springs.
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 lower elevations and basins heat rapidly under strengthening high pressure.
That heat will translate into immediate impacts. Road surfaces along I-80 and I-25 will heat up during peak afternoon hours, increasing stress on vehicles and raising the risk of tire failures, especially on long, open stretches between cities. In urban areas like Cheyenne and Casper, pavement and infrastructure will absorb heat, pushing surface temperatures higher than surrounding areas.
Limited overnight cooling will add to the strain, particularly in lower elevations where temperatures stay elevated after sunset, reducing relief and increasing exposure risk for outdoor workers and travelers without cooling.
Dry air combined with heat will also elevate fire risk across central and southern Wyoming, especially near Rock Springs and Casper where grasses 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.
