see which way the wind blows
To find out about or come to understand a particular state of affairs or the way a situation exists or has developed, especially before taking any decisive or definitive action. Given the turbulent nature of this market, I think it would be prudent for us to see which way the wind blows before we agree to invest in your company. I'm just seeing which way the wind blows between my parents before I make any solid plans to come visit them.
see which way the ˈwind blows
see what most people think, or what is likely to happen before you decide how to act yourself: Most politicians are careful to see which way the wind’s blowing before they make up their minds.