明日(あした) ashita晴(は)れ()る() hareruかどうか kadouka分(わ)か()り()ま()せ()ん() wakarimasen。 I don't know whether it'll be sunny tomorrow. Literal Tomorrow clear-up [whether-かどうか] know-not. ~かどうか embeds an indirect yes/no question — 'whether or not X.' The entire clause 晴れるかどうか becomes the object of 分かりません ('I don't know'). This is the standard pattern for embedding uncertainty about a binary outcome. weather~かどうか (whether or not)
明日(あした) ashita晴(は)れ()る() hareruかどうか kadouka分(わ)か()り()ま()せ()ん() wakarimasen。 I don't know whether it'll be sunny tomorrow. Literal Tomorrow clear-up [whether-かどうか] know-not. ~かどうか embeds an indirect yes/no question — 'whether or not X.' The entire clause 晴れるかどうか becomes the object of 分かりません ('I don't know'). This is the standard pattern for embedding uncertainty about a binary outcome. weather~かどうか (whether or not)