9to5Google points out a new weather icon over the map layer has rolled out widely in the Android version of Google Maps with the current conditions and air quality (Maps also added dedicated wildfire and AQI layers in recent years). If tapped, it opens a tile showing the local forecast for the next few hours. This has existed in the iOS version for years, and some have seen it popping up on Android for months, but it might be new to you.
Different teams with different priorities. But I would’ve also assumed that they roll out features simultaneously on all platforms.