Bring up sWeather and choose Options > Show raw weather data from the menu (or press F7). In the webpage that comes up, look for the "lastBuildDate" line, e.g.: <lastBuildDate>Mon, 01 Jul 2019 03:49 PM CDT</lastBuildDate>
If it matches the "08:00 AM CDT" that's showing in sWeather, the problem is on Yahoo! Weather side. If so, this usually works itself out over a matter of hours (sometimes days).