A late‑April cold snap is prompting a yellow‑level frost advisory for areas south of Waterloo Region, with Environment Canada warning that temperatures will dip to near- or below-freezing overnight into Friday morning.
The advisory was issued at 9:10 a.m. Thursday applies to a wide stretch of southern Ontario, including Woodstock, Brantford and the GTA.
Environment Canada says the impact level is moderate with high confidence in the forecast, noting that patchy frost is likely to form under clearing skies and cold overnight air.
Residents are being urged to cover vulnerable plants or bring potted ones indoors, especially in frost‑prone or low‑lying areas where temperatures can fall more quickly.
Cold pattern continues into weekend as May arrives
The frost threat follows a stretch of below‑seasonal temperatures across the municipality. The region is heading into a chilly start to May, with daytime highs struggling to reach the low teens and overnight lows repeatedly dipping below zero.
Thursday’s high is expected to reach only 12 C, with scattered showers lingering. Friday will be a touch cooler with a high near 11 C and a low around -4 C.
The weekend is looking clear in Waterloo Region, with both Saturday and Sunday showing bright, sunny days. Both are much cooler than the normal, hovering around 8 C and 13 C respectively.
Temperatures are usually around 16 C for this time of year, Environment Canada data shows.