MILES LINDHOLM OF Felch Township takes a paddleboat out on Six Mile Lake as the sun goes down Saturday. The lake later had fireworks. (Betsy Bloom/Daily News photo)

IRON MOUNTAIN — Relief from hot and humid weather over the next week is expected to come only in the form of thunderstorms, the National Weather Service said.

Storms are possible each day today through Friday, the agency said in a hazardous weather outlook issued Sunday.

High temperatures, meanwhile, are expected to range near 90.

“Make sure you and your pets stay hydrated,” the weather service advised. “Never leave pets or passengers unattended in hot vehicles.”

The extended heat wave will cover much of the U.S., forecasters said.

“A broad ridge of high pressure and a jet stream that will remain well to the north will allow heat to spread across large sections of the Plains, Midwest, Northeast and Rockies,” said Jonathan Belles, a meteorologist at weather.com. The hottest weather compared with average temperatures will be around the Great Lakes through later this week, he added.

The U.S. Drought Monitor shows no areas of concern in Michigan and Wisconsin, except for abnormally dry conditions in areas of the Keweenaw Peninsula and moderate drought in the northwestern corner of Wisconsin.

At Iron Mountain-Kingsford, rainfall in June measured 5.36 inches, which was 1.8 inches above normal.

Temperatures in June at the Iron Mountain-Kingsford Wastewater Treatment Plant cooperative observer site averaged 65.1 degrees, which was 1.5 degrees above normal. The highest temperature last month was 92 degrees on June 3 and the lowest was 37 on June 13.

A long-range forecast from the Climate Prediction Center calls for a 43% chance of above-normal temperatures through September, and a 24% chance of below normal. Precipitation trends over the same period are expected to be near average.