From Old East Slavic *dъždь, itself from Proto-Slavic *dъždžь. Cognate with Ukrainian дощ (doshch) and Polish deszcz. The root is shared across Slavic languages and likely traces to a Proto-Indo-European root related to moisture or flow.

Rain holds a special place in Russian folklore and everyday speech. The phrase "идёт дождь" (it's raining) literally means "rain is going/walking" — Russian uses the verb идти (to go/walk) for rain, unlike English. Rain in late May (like today's date) signals the beginning of summer warmth in Russia, and there is a folk belief that rain on a holiday brings good luck.