Tillsonburg, Ontario is seeing a sharp turnaround in the weather this week after early-May frost advisories, with Environment Canada reporting a temperature of 20.4 C at 1:00 PM on May 25, 2026 and a forecast high of 25 C for the day.
In late April, Environment Canada issued a yellow frost advisory for Oxford County, warning of overnight lows near -4 C that could feel like -8 C with wind chill. There were also reports of sporadic rain-snow mixes and localized snowfall across parts of southern Ontario in early May, and Tillsonburg recorded a low of 0 C on May 12, 2026, according to historical weather data.
Environment Canada’s forecast shows the warming trend continuing through the week, with highs expected to reach 28 C on Tuesday and 27 C on Wednesday, and overnight lows staying above freezing. The agency also noted a humidex in the high 20s and a very high UV index for late-May conditions.
There are no active weather alerts for the Woodstock – Tillsonburg – Oxford County region as of May 25, 2026, and Ontario 511 reports no road closures or incidents affecting the Tillsonburg area, indicating normal driving conditions on Highway 3 and surrounding roads. The shift from early-May frost to late-May warmth should make outdoor activities more comfortable for residents and gardeners planning spring work.
