The Treasure Valley is heating up this week, signaling a warmer summer

After a sunny weekend and a mild-weathered Memorial Day, the Treasure Valley can expect near record-high temperatures this coming week.

Some clouds appeared Monday, as Boise meteorologists predicted, but clear skies are anticipated for the rest of this week, according to the National Weather Service.

Tuesday’s weather forecast sees sunny and clear skies, with a high of 84 degrees. Temperatures are expected to keep rising with Wednesday seeing a high of 92. After that, temperatures are expected to hover around 90 for the remainder of the week, with Thursday at 94 and Friday at 90.

While Boise isn’t expecting triple-digit temperatures quite yet, the forecast says it will get close on Saturday, May 31, with a predicted high of 98. If temperatures do get that high, it will tie the 1910 record for May 31. More recently, the last time it got up to 98 in May was on May 30, 2020.

“It’s definitely going to be approaching records, and regardless of records or not, it’s still going to be very hot that day especially for late May, early June time period,” said Jaret Rogers, NWS Boise meteorologist, in an interview with the Idaho Statesman. “It’s going to feel pretty, pretty warm compared to what we’ve seen over the past couple months.”

Rogers notes that the heat wave won’t last long, though.

“By Sunday, another storm system is expected to move in, and we’ll start to see a transition towards cooler temperatures and wetter weather,” Rogers said. “But before that happens we’re going to be pretty warm and dry.”

High temperatures for May are an average of around 72 degrees, according to the NWS weather almanac. But Idaho can expect a warmer and drier summer than average, the National Weather Service predicted.

Parts of Southern Idaho can expect 60-70% probability of temperatures above average, with the rest of the state falling into the 50-60% category. Nearly all of Idaho can expect a 40-60% chance of less precipitation throughout June, July and August, according to National Weather Service climate predictions.

“The longer-term projections for the summer as a whole are favoring above normal temperatures but that doesn’t necessarily mean the entire summer is going to be really hot. If you average the temperature throughout the whole summer it’s expected to be above normal” Rogers explained.

With high temperatures so early in the year, Rogers advises residents to take precautions for heat safety.

“The heat is definitely a concern, especially early in the season like this, where most people probably aren’t too acclimated to seeing temperatures anywhere in the 90s but especially in the upper 90s that really can take a toll on your body,” he said.

Precautions advised by the National Weather Service during a heat wave include:

• Slow down, especially children and seniors or any groups sensitive to the heat. Reduce, eliminate or schedule strenuous activities during high temperatures.

• Dress appropriately, opting for loose, lightweight and light-colored clothing.

• Drinks lots of water.

• Minimize direct exposure with the sun and make sure to use sunscreen when outdoors.

• Use air conditioning and/or opt for shaded areas when outside.

This story was originally published May 27, 2025 at 1:56 PM.