The storm system that has been bringing rain to the Portland, Ore., area is weakening, but will bring more rain, some snow and colder air into Thursday.
"Overnight Wednesday, the low temperature will be in the mid- to upper 30s," said AccuWeather Meteorologist Andy Mussoline.
The overnight low on Tuesday was about 15 degrees warmer, at 45 degrees F.
Daytime temperatures on Thursday will struggle to reach the low 50s. Some lingering showers are also possible.
"A few inches of snow could accumulate in the Cascades at altitudes above 2,500 feet," Mussoline said. "Travel over the passes could be slippery early Thursday morning."
Severe thunderstorms will threaten holiday festivities across parts of the Midwest to close out the extended Labor Day weekend.
Severe threats include damaging winds, flooding downpours, large hail and some tornadoes.
The next Atlantic tropical depression or storm may take shape in the southwestern Gulf of Mexico's Bay of Campeche by midweek.
A second volcanic eruption occurred on Sunday morning in Iceland in the same area that had one on Friday.
Labor Day weekend traditionally marks the unofficial end to summer, but the weather has another idea in mind around Washington, D.C., with a prolonged stretch of summer heat underway.
Labor Day weekend traditionally marks the unofficial end to summer, but the weather has another idea in mind with summer warmth surging in around Boston.
Milwaukee, WI (1988)
Hottest summer on record. Six days of 100 degrees or greater and 36 days of 90 or above. Average temperature of 73.8 beat the old record of 72.8 set in 1921 and 1955. The normal average tempera- ture for a summer in Milwaukee is 68.3 degrees.
Washington Co., IA (1897)
Hail fell and drifted in piles 6 feet deep in Washington County.
Yuma, AZ (1950)
123 degrees - hottest temperature ever in Yuma. Yuma is the hottest city in the U.S.