Port Colborne residents can expect a warm and sunny start to the week, but Environment Canada is forecasting a shift to unsettled conditions starting Tuesday. Monday, July 20, 2026, is set to be sunny with a high of 25 degrees C and a humidex making it feel like 28. The UV index will be very high at 9, so sunscreen is a must for anyone spending time outdoors.
The weather takes a turn on Tuesday, July 21, with showers and a risk of thunderstorms moving into the area. Southwest winds will gust up to 70 km/h throughout the day, and despite a high of 25 degrees C, the humidity will make it feel much hotter with a humidex of 33. Wednesday, July 22, brings a cooler day with a high of only 20 degrees C and a 30 percent chance of showers.
Relief from the unsettled pattern is expected later in the week, with sunny skies returning Thursday and Friday and temperatures climbing back to the mid-20s. The Environment Canada forecast shows highs of 23 degrees C on Thursday and 25 degrees C on Friday.
This week’s forecast comes after an active period of severe weather in the Niagara region earlier this month. In early July, storms brought wind gusts up to 110 km/h and hail the size of ping-pong balls to areas near Port Colborne. Those storms caused damage to roofs, fences, and trees, and some residents are still cleaning up. For this week’s thunderstorm risk, residents are reminded to secure outdoor items and stay indoors if storms approach.
Current conditions as of late Monday morning at the Welland-Pelham weather station showed a temperature of 21.4 degrees C, humidity at 45 percent, and falling pressure at 101.6 kPa, a sign that changes are on the way. Residents are encouraged to keep an umbrella handy and monitor alerts throughout the week.
