This is the 10548th most frequent Polish word.
deszczowe
The Polish word "deszczowe" means "rainy" in English.
In this case, 'deszczowe' modifies the noun 'chmury' (clouds), specifying the type of clouds as 'rainy' ones associated with precipitation.
Chmury deszczowe są oznaką nadchodzącej burzy.
Rainy clouds are a sign of an approaching storm.
Here, 'deszczowe' is applied as an adjective to describe the noun 'popołudnie' (afternoon), characterizing the time period as expected to be rainy.
Przyniosłem parasolkę, bo zapowiadali deszczowe popołudnie.
I brought an umbrella because they were forecasting a rainy afternoon.
Here, 'deszczowej' is used as an attributive adjective describing the noun 'pogodzie' (weather), indicating the weather condition as 'rainy'.