As a weak disturbance moves off the Pacific into the Northwest, Seattle will see a chance for some light rain early in the weekend before a larger storm system moves in.
"We can't rule out a shower Saturday night into Sunday morning," AccuWeather.com Meteorologist Frank Strait said.
Daytime temperatures will stay in the mid-50s, while overnight lows will hover in the high 30s and low 40s.
"Monday is a nice day, pretty sunny, but it will cloud up Monday night into Tuesday," he said. "There will be a storm moving in off the Pacific into the Northwest."
Monday could be the mildest day of the year so far in Seattle with a high of 63 F.
In addition, snow levels along the Cascade Range will remain below pass level as the storm moves in.
"Anyone thinking about traveling through the Cascades may experience some potentially rough travel," Strait said.
As the storm moves through, the early workweek will see more cloudy skies and showers into Wednesday, he said.
The second half of the week looks to be noticeably cooler and less humid in the Chicago area.
Tropical Depression Two has formed in the Atlantic and could become the next tropical storm of the season by midweek.
Warm and humid air in place over much of the Northeast at midweek will contribute to the risk of drenching, gusty and locally severe thunderstorms on Wednesday.
After temperatures briefly climb to typical midsummer levels, another cooldown will roll into the Midwest and expand to the East for the last part of July.
With the recent heat fading away, more relief will greet the Northwest by midweek in the form of rain.
Canton, IL (1975)
A tornado ripped through a 3-block section of downtown, killing 2 people, injuring 75 and creating $5 million damage. A 15-foot wooden plank was driven through an auto engine block, splitting the front of the car in two. The woman driving was not injured. National Guardsmen were called in to prevent looting.
Columbus, OH (1979)
This is the first year in 101 years of record keeping at Columbus in which the temperature has not reached 90 degrees by July 23rd.
Hurricane Delores, west of Baja California, causes high surf along the Southern California coast.