Environment Canada is calling for hot and sticky weather in Grimsby, Ontario, this week as a humid air mass settles over the region. Daytime highs will climb to 30 degrees Celsius on Thursday, August 6, and the humidex is expected to reach 39, making it feel much warmer outside. No heat warning is in effect, but residents are being urged to take it easy in the heat.
As of late Wednesday afternoon, it was already 24.3 degrees at Vineland Station, with the humidex at 31 and humidity sitting at 74 per cent. That warmth is only going to build overnight, with the temperature staying around 20 degrees. The forecast high of 30 is about five degrees above what Grimsby normally sees at this time of year.
Thursday will bring a mix of sun and cloud, along with a very high UV index of 9. Health officials say anyone spending time outdoors should use sunscreen, wear a hat, and seek shade during the midday hours. There is a 30 per cent chance of late-afternoon showers, with a risk of thunderstorms.
The unsettled pattern is expected to continue Friday, Saturday, and Monday, with Sunday offering a brief sunny break. Scattered showers and the chance of storms remain in the forecast, with a 40 per cent chance Friday and 60 per cent Saturday and Monday. Despite the humidity and warmth, Environment Canada has not issued any alerts for Grimsby at this time.
A heat warning is triggered in Niagara when daytime highs reach 31 degrees or warmer and overnight lows stay at 20 degrees or above for two days in a row, or when the humidex reaches 40 on back-to-back days. With Thursday’s humidex forecast at 39, the community will be close to that threshold. Residents who need a break from the heat can visit local cooling centres at municipal recreation facilities.
