Wishing for a strong gusts of headwind too...
All hopes for strong gusts as headwinds are pretty much fragile, this although with the mountains raising right up next to the lido you sometimes experience the unexpected as sudden gusts down the mountains, but I highly doubt it will apply tomorrow
Various weather forecast mentions 3-4 m/s, all day, in the morning from the east, i.e. along the lido in complete shelter from the Apennines (with the rich marble deposits that the area is known for), changing wind direction to almost downright tail winds from south for the crucial long lido stretch.
Regarding showers the time table for drying up have moved a bit. Yesterday forecast dry from about 2pm to now round 3-4pm.
So if only a little further shift in wet timeframe, 17-19°C and light wind, light drizzle 0.2-0.4mm precipitation, I think there may still be slippery spots when the GC riders passes through.
Also depends on whether new asphalt has been laid, which together with road stripes can make it a risky business especially for early starters like Ganna.
(In 2009 when I visited the area myself, the surface was terrible on some sections around Viareggio and then random fresh asphalt towards Massa).
So if the wind can't give an extra spice, at least a varible of light rain and more precise time for permanent clearing
I would think that it may be enough to create at least some small surprises.