{"id":11658,"date":"2026-07-25T00:49:03","date_gmt":"2026-07-25T00:49:03","guid":{"rendered":"https:\/\/lets-canada.com\/zh_tw\/?p=11658"},"modified":"2026-07-28T06:57:20","modified_gmt":"2026-07-28T06:57:20","slug":"vancouver-yellow-heat-warning-july-2026","status":"publish","type":"post","link":"https:\/\/lets-canada.com\/en\/vancouver-yellow-heat-warning-july-2026\/","title":{"rendered":"Why Did Vancouver Get a Heat Warning at 25\u00b0C? Yellow Alerts Explained"},"content":{"rendered":"\n

Updated: July 27, 2026, 9:26 p.m. PDT.<\/strong> Conditions can change quickly. Environment Canada showed no weather alerts in effect for Vancouver, Burnaby and New Westminster at this check.<\/small><\/p>\n\n\n\n

At 4:13 a.m., a phone showed Vancouver at 21\u00b0C, with a high of 25\u00b0C and a low of 20\u00b0C. Just below the forecast sat a yellow heat warning and another alert for air quality. The obvious question was: since when does 25\u00b0C count as a heat warning?<\/em><\/p>\n\n\n\n

\"Vancouver
A Vancouver weather screen at 4:13 a.m. on July 23, 2026, showing both yellow heat and air-quality warnings. Image supplied by a Let\u2019s Canada reader.<\/figcaption><\/figure>\n\n\n\n

The phone was not wrong, but its single-city temperature did not show the full area or criteria behind the official warning. Environment and Climate Change Canada issued a yellow heat warning for Metro Vancouver on July 22. Inland sections were forecast to reach the low to mid-30s, while western neighbourhoods near the water were expected to stay in the high 20s. Overnight lows across the region were only expected to fall into the mid to high teens. A 25\u00b0C reading for Vancouver\u2019s more coastal forecast did not represent Burnaby, New Westminster or hotter inland communities.<\/p>\n\n\n\n

A yellow warning is not based on one afternoon high alone. HealthLink BC<\/a> says it signals unusually hot temperatures lasting at least two days. People without access to a cool indoor space face greater risk, especially older adults, people who live alone, infants, pregnant people and those with chronic health conditions. Warm nights matter because homes and bodies get less time to cool down.<\/p>\n\n\n\n

The screenshot also captured a second issue: an air-quality warning. On July 22, hot sunny weather, local emissions and wildfire smoke raised ground-level ozone and fine particulate matter across parts of Metro Vancouver. When heat and smoke arrive together, opening a window is not always the right answer; check current air quality first. Our wildfire smoke and AQHI guide<\/a> explains the Canadian scale.<\/p>\n\n\n\n