The weather could damage trees that are still recovering from a drier-than-normal summer, according to the national weather agency.
Environment Canada posted the notices for almost all of Vancouver Island, Metro Vancouver, Howe Sound, the North Shore and the Sunshine Coast on Thursday morning.
The first round is expected to start Thursday afternoon, petering off overnight. The second, heavier rain spell will begin on Friday and continue until Saturday.
Communities near the Strait of Georgia could also see winds of up to 60 km/h — gusts strong enough to put weak trees at risk.
Meterologist Bobby Sekhon said it should be the South Coast's first big rainfall of the season.
"Certainly, it can be a concern for anybody who's not prepared for the fall storm cycle," he said.
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Brian Quinn, director of park operations for the Vancouver Park Board, said drought-like conditions around southern B.C. contributed to the severity of the damage that year.
After that, the city said it was reassessing the types of trees it plants, looking for species that can better tolerate extreme heat and drought.
A cold front brought flurries to Fort St. John, Dawson Creek and Prince George on Sept. 11 — nearly two weeks before the first official day of fall.
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Over the next two days, residents living in Metro Vancouver and the North Shore should prepare for an abundance of rain and gusty winds.
According to a statement, “a pair of Pacific disturbances are approaching the south coast of BC.” The result will be heavy rain and “brisk southeast winds” in Vancouver Island and the inner south coast.
The downpour is expected to start later this afternoon and grow in intensity by this evening. Showers will continue throughout Friday, hopefully ending sometime on Saturday.
By Friday morning, anywhere from 20 to 50 mm of rain are expected. 30 to 50 mm of rainfall are expected from Friday afternoon to Saturday morning.
Be sure to dress for the weather, bring an umbrella along, and if driving, leave extra time for getting to and from your destination.