А разве не raindrops?

Valery's translation is correct - this means rain here and there throughout the day

я регулярно слышу это выражение в новостях погоды на ВВС

Правильно, Валерий, а иногда тоже spotty rain 👍🏼

I wanted to give the same translation as Valery's at first, but found those snippets on Ngram: https://www.google.com/search?q=%22spots%20of%20rain%22&tbm=bks&lr=lang_en

Elena, your translation also applies in a very literal way. That’s why I didn’t say anything.

Ah, OK)