aurinkoista

Aurinkoista is a Finnish adjective form derived from the noun aurinko (sun). It is the partitive singular form of aurinkoinen, meaning sunny or bright with sunshine. In practice, aurinkoista is used to describe weather or atmospheres, often with nouns in the partitive case, such as päivää (day) or iltaa (evening). The base form aurinkoinen is used in non-partitive contexts, while aurinkoista appears in phrases that indicate an indefinite amount or a state, especially in weather-related expressions.

Common uses include greetings and wishes in everyday language. Examples are Aurinkoista päivää! (“Have a sunny day”), Aurinkoista iltaa! (“Have a sunny evening”), and Aurinkoista viikonloppua! (“Have a sunny weekend”). In weather statements the predicate form can be aurinkoista, as in Sää on aurinkoista (“The weather is sunny”) or On aurinkoista (“It is sunny”). When describing a specific, countable thing you would typically use the nominative form aurinkoinen, for example, päivänä lit. versus aurinkoisen päivän as a noun phrase in other cases.

Etymology and related forms: the word stems from aurinko (sun) and the adjective-forming suffix -inen. The relationship to aurinkoinen contrasts with kuinka aurinkoista in partitive contexts. Related Finnish terms include aurinko (sun), aurinkoinen (sunny), sää (weather), and päivä (day). The term is widely used in forecasts, signage, and everyday expressions to convey pleasant, sunlit conditions.