I bet it will be good to go because it will be lower than normal around that time.
I did the SF a few years ago. It was about 5-5.5 feet. I thought it was fine in a kayak, but some of the rafters were pretty gripped. We got surprised at surprise and had a little carnage. Don't let that one sneak up on you.
I would be cautious putting on with cats/rafts at flows of 5 feet or higher. There's lot's of big holes and continuous whitewater. Portaging at either devil creek or fall creek would be a bitch. The surprise/elk creek section runs together and gets big.
Keep it Steep