Residents in Mississippi Mills, Ontario, can expect one more day of hot, partly cloudy weather on Wednesday, August 5, 2026, before showers and possible thunderstorms move into the area for the rest of the week.
According to Environment Canada, the high temperature will climb to near 30 degrees Celsius, but with humidity it will feel more like 36. The UV index is forecast to be high, so anyone spending time outside should take precautions.
Health officials recommend wearing sunscreen with at least SPF 30, a hat, and UV-protective sunglasses. It’s also a good idea to seek shade or limit time in the sun during the peak hours of 11 a.m. to 3 p.m., when the UV rays are strongest.
This hot, partly cloudy break comes ahead of a shift in the weather. Beginning Thursday, August 6, clouds will roll in and bring a 60 percent chance of showers along with a risk of thunderstorms. A high of 30 degrees and a humidex of 38 are still expected, keeping things sticky and uncomfortable.
The unsettled pattern is expected to linger right through the weekend. Friday will see a 40 percent chance of rain and a high of 28, while Saturday carries a 60 percent chance of showers and a cooler high of 26 degrees. This lines up with the kind of changeable summer The Weather Network predicted for the region, with heat interrupted by wetter spells.
The Mississippi Valley Conservation Authority had warned of severe low water levels in the Mississippi River watershed last fall, but conditions returned to normal by January 2026. The coming rain is unlikely to raise any flood concerns, but the conservation authority continues to monitor conditions as the summer unfolds.
