Environment Canada is warning Sandy Bay, Manitoba, that a steady warm-up will push daytime highs from about 24°C on Monday, May 25, 2026 to around 35°C by Friday, May 29, 2026, leaving local temperatures far above the usual late-May high of 21°C.
The sharp rise is part of a wider heat pattern across the Prairies driven by an omega block in the upper atmosphere, a stable set-up that can lock warm air in place for several days, the Weather Network says. Forecasters note Manitoba is expected to see 30°C conditions through Friday, and this event could produce a new national high for 2026 after the year-to-date top reading of 33.5°C recorded in Lytton, B.C. on May 5.
Such sustained warmth in May is uncommon in this province. Manitoba typically sees less than one full day above 30°C during the month of May, and the multi-day run into the mid-30s would be highly unusual. Last May, Winnipeg set a striking early-season mark when temperatures reached 35.2°C near the airport, showing how early heat spikes are becoming more notable in the region.
Manitoba Health, Seniors and Long-Term Care operates a Heat Warning system that is triggered when daytime highs reach 32°C (combined with nighttime lows of 16°C or higher) or the humidex reaches 38 for two or more consecutive days; those are the thresholds officials use to consider issuing a warning. With Environment Canada forecasting consecutive days in the low to mid-30s, residents should watch for any Heat Warnings and follow local public health advice. Early-season heat can affect people more because bodies have not yet had time to acclimatize, so residents should prepare for hotter conditions and monitor official updates from Environment Canada and the Manitoba Health.
