Russ,
I think tonights a good chance. It was sunny out my way this morn (Salisbury) and looking on Transport SA webcam its sunny at Outer Harbor now. Beauro forecast for Gulf st vincent looks good and i usually look at this compared to the metro waters forecast. Only thing is it might go S-easterly by 6 or 6.30 given where the isobars are sitting later in the day. Prob best somewhere between 3-6pm.
If you get there later and its more SE then either chicken shop or Nth haven can be better as Semi gets too offshore.
Tomorrow - isobars dont look as good (too SE) but hotter temperature and beauro is forecasting it
Saturday - map looks better
**Disclaimer** - its nature and anything can happen

Pity the West coast is too far to go for an after work sesh

What time would you get there?