Does iOS do the freaky-accurate “light rain starting in five minutes, ending twenty minutes later” thing? If so, I’d love to know where, I’ve missed it.
Yes. If there’s rain forecasted for the next hour, it’s displayed prominently on the top of the weather interface (it’s hidden if there’s no rain expected). It will also appear on your home screen if you add a weather widget.
FWIW, Google does that (at least on Android). You get a notification if it's expected to rain soon.
Honestly, Dark Sky had been my habitual weather app until Apple killed it, but it doesn't seem as accurate as I expected. I don't know if this means I've been in places where their data is less optimized, or if I'm just noticing it more now that I have to look at other options.