(Radio Iowa) – Some Iowa school districts will dismiss classes early today (Monday) because of the extreme heat, as high temperatures are forecast in the upper 90s, with heat indices climbing into triple digits. While we’re less than a month from the first day of fall, meteorologist Cory Martin, at the National Weather Service, says this type of heat is usually associated with the dog days of summer. “Today, during the afternoon hours, we’ll be looking at heat index values peaking between 105 to 110,” Martin says. “Some areas may jump a little over 110, with the highest readings likely to be in eastern Iowa today.”

The entire state is under a heat advisory, while excessive heat warnings are posted for wide sections of eastern and western Iowa. “So it’s really across the whole state, when you’re looking at the different advisories and warnings, those both key in on different thresholds, but really the end result to everyone today is — it’s going to feel hot and humid outside,” Martin says. “It’s important to take your precautions, to limit your time outside, and make sure you’re adequately hydrated, and really just limit your time exposed to the heat.”

Tuesday will only be slightly cooler, with highs in the 80s and 90s statewide, though Martin says we should see a cool-down soon. “As we go through the week, we’re still looking at temperatures gradually tailing off,” Martin says, “with highs back to around 80 degrees across much of the state as we head into the weekend.”

The forecast for Labor Day weekend calls for more seasonal temperatures and dry conditions.