Vancouver experiences above-normal temperatures in early September, followed by a cooler period due to a high-pressure ridge.

Vancouver's September begins with a hot start, with above-normal temperatures expected for the first two weeks. However, due to the hot spell, temperatures will drop to seasonal averages by Monday and Tuesday. This warm period is followed by a cooler period as a ridge of high-pressure moves into the region. Environment Canada predicts above-average temperatures to continue through October and November with "low probability." La Niña is expected to make this winter wetter and cooler in the Lower Mainland.