Residents across Durham Region can expect a mild but misty start to their day as a unique weather pattern moves through southern Ontario. Environment Canada has issued a forecast for Friday, April 17, that highlights fog and above-normal temperatures significantly higher than the seasonal average. While the morning is expected to be dominated by cloudy skies and localized fog patches—particularly in Oshawa—the afternoon will offer a brief reprieve with a mix of sun and clouds. This spring warmth comes just before a projected weekend shift that could see the return of rain and even flurries as temperatures plummet.
The fog and above-normal temperatures are particularly notable when compared to the typical conditions for mid-April. In areas like Mississauga and the broader Greater Toronto Area, temperatures are expected to soar to a high of 20°C, while Hamilton will see around 17°C. For context, the seasonal normal for this time of year usually sits between 2°C and 12°C. This unseasonable warmth follows a period of heavy rain and flooding risks earlier in the week, providing a temporary dry spell for the region. However, the weather agency warns that the humidity accompanying these high temperatures will likely lead to the redevelopment of fog patches overnight as the low drops to approximately 10°C.
Looking ahead, the pleasant fog and above-normal temperatures of Friday will quickly vanish as we head into the weekend. A 60 per cent chance of rain showers is forecast for Saturday, with the probability of precipitation remaining at 40 per cent into the evening. The most dramatic change occurs on Sunday, when a cold front is expected to push through the region. Sunday’s high is forecast at a mere 6°C, but the evening low could crash to -2°C. There is a 30 per cent chance that Sunday’s rain showers will transition into flurries, reminding residents that the transition into spring in southern Ontario is rarely a straight line.
Travelers and commuters in Oshawa and Whitby should be mindful of the early morning fog, which may reduce visibility on major routes like Highway 401. The “calm before the storm” atmosphere on Friday serves as a final opportunity for outdoor activities before the damp and cold conditions return. With the fog and above-normal temperatures being so far outside the standard April range, meteorologists are keeping a close eye on how this moisture will interact with the incoming cold air on Sunday night.
In summary, Friday offers a strange blend of late-spring warmth and early-morning mist. The fog and above-normal temperatures will provide a temporary high of 20°C before the region prepares for a sub-zero Sunday. Residents are encouraged to enjoy the afternoon sun but keep their winter coats and umbrellas ready for the sharp turn in conditions expected within the next 48 hours.
