Residents in Grimsby, Ontario, can expect a brief window of warm, sunny weather this Thursday, April 23, 2026, before an unsettled weather pattern brings cooler temperatures and rain to the region.
According to Environment Canada, today will see a high of 17°C, though temperatures near Lake Ontario will be cooler at 11°C. The forecast also notes a high UV index of 7. There are currently no weather alerts in effect for the town, and as of 9:00 a.m., conditions at the local Vineland Station were recorded at 8°C with rising air pressure.
The pleasant conditions will shift on Friday, April 24, as the forecast turns mainly cloudy. There is a 40 percent chance of morning showers, which are expected to clear by the afternoon. Winds from the east are expected to gust up to 40 km/h, with a daytime high of 11°C.
Unsettled weather is set to continue into Saturday, April 25, which will be cloudy with a 60 percent chance of showers. Temperatures will remain near 11°C during the day, dropping to a low of 6°C on Saturday night, with a 40 percent chance of continued rain.
These conditions reflect a broader trend for the season, as regional spring forecasts predicted cooler-than-normal temperatures and above-normal precipitation through April for Ontario. While today’s temperature is slightly above the typical April average high of 14°C, residents planning outdoor activities may want to take advantage of the sunshine before the showers arrive later in the week.
