Hi, jennysa,
Sorry to hear that you may get wet tomorrow. Years ago, the Hospitales route was not well marked, so pilgrims were advised to stay off in bad fog. Now the markers are so close, that if you are walking with someone, you will not have a problem. One can go ahead and find the next marker while you are in voice contact if the fog is really bad.
If the forecast for the next day looks much better, though, and if you have the time, I would consider going to Pola de Allande tomorrow (I have done that in the rain) and then climbing up to Puerto de Palo the next day.
The walk from Pola de Allande up to the high point (where it meets up with the Hospitales route) is very nice, very green and rural, babbling brooks, heavily shaded, until the last bit of steep ascent up to the puerto itself. And then at that high point you have the hospitales view, although you will not have had the advantage of walking along the ridge, which is what the Hospitales route does.
Buen camino, Laurie