noun
weekly weather forecast
Refers to a weather forecast covering the upcoming week, commonly seen in newspapers, TV, and apps.
今朝の週間天気予報によると、週末は雨らしい。
According to this morning's weekly weather forecast, it looks like rain this weekend.
General term for any weather forecast, while 週間天気予報 specifically covers a one-week period.
Compound of 週間 (shūkan, 'week') + 天気予報 (tenki yohō, 'weather forecast').