The default iOS Weather app has 18 icons that predict subtle changes in upcoming conditions. You should be able to look at the weather icons and see how the day ahead will play out.
All iOS Weather Icons (Part 1)
The iPhone Weather app doesn’t include descriptions of the weather icons. So Apple has released a handy chart that explains the iPhone weather icons. It’s helpful, because while some of the weather icons have slight differences, others are fairly easy to understand.
To use the Weather app, enter a city, zip code, or airport name. Select the location to see the hourly forecast, followed by the 10-day forecast. A weather icon appears next to each hour and day.
The Weather app is built into the iPhone. The icons listed above are used by that app. Since there are numerous other weather apps, it is likely that the icons listed above are unique to Apple's app.
