People heading back to work and school after the winter holidays should pack an umbrella for heavy rain.
According to Environment Canada, a moist Pacific frontal system is expected to bring 60 and 90 millimetres of rain to the Lower Mainland and eastern Vancouver Island on Monday and Tuesday morning, respectively.
Drivers are asked to watch out for water pooling on the roads and flash floods in low-lying areas.
A winter storm warning has been issued for the Okanagan Connector between Merritt and Kelowna, and for Highway 3 and Allison Pass between Hope and Princeton. The highways are expected to get 10 to 15 centimetres during the day Monday and another 10 to 20 centimetres overnight.
The rainfall warning on the Island applies to the east coast from Nanoose Bay to Fanny Bay.
The Regional District of Nanaimo posted on social media that no flood advisories have been issued at this time, but staff are monitoring water levels closely.