Port Colborne, Ontario, is in for a typical September week, with a mix of sun and cloud and temperatures ranging from 9°C to 20°C, according to Environment Canada.
As of 1:00 PM EDT Monday, September 21, 2026, conditions at the Welland-Pelham weather station showed 13.6°C, northeast winds at 21 km/h, and 85% humidity. The forecast for the day calls for a mix of sun and cloud with northeast winds of 30 km/h gusting to 50 and a high of 16°C. The UV index is expected to be 6, which is considered high.
Looking ahead, temperatures will gradually climb through the week, peaking at 20°C on Friday before settling back to 19°C by Sunday. Skies are expected to be a mix of sun and cloud through much of the week, with no precipitation forecast. Overnight lows will dip to around 9°C. No weather alerts are currently in effect for the area.
These conditions are in line with historical September averages for Port Colborne, which normally see highs around 20°C and lows around 11°C. Located on the north shore of Lake Erie, the city benefits from the lake’s moderating influence, which keeps temperatures from swinging too dramatically during this transition season.
Residents can keep up with the latest forecast on the Environment Canada website.
