This is the 3278th most frequent Polish word.
słonecznej
"Sunny" or "solar" (genitive or locative case, feminine singular form).
used as an adjective to describe weather as sunny in the instrumental case.
Spacerujemy po plaży w pięknej słonecznej pogodzie.
We are walking on the beach in beautiful sunny weather.
used as an adjective describing the porch as sunny in the genitive case.
Obserwujemy zachody słońca z tarasu słonecznej werandy.
We watch sunsets from the terrace of the sunny porch.
used as an adjective to forecast that Saturday will be sunny in the genitive case, agreeing with a feminine noun.