The Bay Area is in the grip of a heat wave right now. But if you’re feeling like it’s even hotter out there than your phone’s weather app says it is, there’s a good chance you’re not imagining it.

Beyond sticking my arm out of the window, an Android weather app is the best bet for predicting how warm, cold, or wet the air is likely to be during the day. However, not all apps are the same. These ...