Weather whiplash? Boise could see warmest March day ever this week, followed by storms
Winter is finally over! Potentially record-breaking temperatures are headed for the Treasure Valley this week, but Boiseans should enjoy the mild weather while they can because it won’t last long.
Boise was expected to see highs of 74 degrees Tuesday and 79 degrees Wednesday, according to National Weather Service meteorologist Wasyl Hewko.
The temperature could end up even higher, however, putting Wednesday in the running for the warmest March day in Boise’s recorded history.
The hottest March temperature ever recorded in the city was an 82-degree day on March 26, 1877, according to the weather service. That record is followed by an 81-degree day that took place more than a century later on March 29, 1978, and an 80-degree day on March 19, 1997.
“Our normal temperatures for this time of year are highs in the 58s and lows in the 37s,” Hewko told the Idaho Statesman by phone. “So we’re definitely going to be above normal.”
Sunny skies will prevail until late Tuesday or Wednesday morning, when clouds are forecast to begin moving into the area from the west, bringing colder, damper weather, Hewko said.
The high temperature likely will drop to 69 degrees on Thursday and could dip as low as 58 degrees on Friday and Saturday.
“We’re going to transition from a warm air mass to a colder one,” Hewko said. “… Behind the cold front is obviously a colder air mass. It tends to be more unstable. And when the sun heats up, it causes some mixing.”
That cold front is expected to begin creating thunderstorms in Oregon on Wednesday, which are forecast to make their way to the Treasure Valley by late Wednesday and last until Thursday or Friday, according to Hewko.
The meteorologist said the front will also bring breezes that could get up to 25-28 miles per hour on Wednesday, with the potential for stronger winds Thursday.
“Once the system pushes through Wednesday, as we get into Thursday, we’re going to have winds changing direction,” Hewko said. “They’re going to become more southwesterly and westerly, and they are definitely going to be increasing to 30 mph.”
The winds are expected to taper off Friday, dropping to about 15 miles per hour.
Highs over the weekend are predicted to stay between 58 and 61 degrees, Hewko said.
This story was originally published March 24, 2025 at 4:23 PM.
