There’s a 40% chance of afternoon showers and thunderstorms.

Denver’s weather is heating up and there’s a chance for afternoon showers and thunderstorms through the holiday weekend.

Skies in the metro area will be mostly sunny on Saturday, there is a 40% chance of afternoon showers and thunderstorms, according to the National Weather Service forecast. The high temperature will top out near 88 degrees.

There is an Ozone Action Day Alert in the metro area on Saturday and it is posted until 4 p.m., according to the Colorado Department of Public Health and Environment. Hot, sunny weather is expected to result in concentrations of ozone in the Unhealthy for Sensitive Groups category. People should limit driving gas and diesel powered vehicles if possible. The sensitive group, which includes people with respiratory concerns including asthma, should avoid prolonged outdoor activities.

Sunday’s weather in Denver will be partly sunny, with a high temp of about 89 degrees and a second-consecutive day with a 40% chance of afternoon and evening showers and thunderstorms.

On Monday, Independence Day, there’s a 30% chance for afternoon showers and thunderstorms in Denver, according to the weather service. Skies will be mostly sunny and the high temperature is expected to hit 91 degrees.

The chance of afternoon thunderstorms drops to about 20% on Tuesday and high temperatures in the urban area will likely be in the 90s for the remainder of the week.