Everyday, is the best day to get your coins off a CEX.
But, September, will be extra risky to leave them there. More risky than normal. Due to the ETH "merge".
Some examples of extra fuckery incoming in September...
- In 2016, coinbase suffered losses due to replay attacks. (ETH vs ETC)
- The centralized stablecoin incentives, and the legal obligations surrounding them, put the definition of 'fork' in question
- ETH holders/traders are way more likely, to not leave their coins on an exchange through the merge, so liquidity may be lower for a couple days, which could impact automated liquidation systems in unpredictable ways.
I'm sure there are more reasons, but...just do it please.