you don't need a weatherman to know which way the wind blows
In real, traceable use. Part of the curated seed collection; community review is coming.
Meaning · English
One does not require an expert to tell one what one already knows.
Where it’s used:
Used
American English
Sources & notes
Adapted from English Wiktionary (CC BY-SA 4.0, retrieved 2026-07-30 via kaikki.org).
Common questions
What does “you don't need a weatherman to know which way the wind blows” mean?
One does not require an expert to tell one what one already knows.
Is “you don't need a weatherman to know which way the wind blows” formal or informal?
No register label has been reviewed yet — treat it as neutral and check the usage notes above.