September in Olympia is generally very nice and can be quite warm even hot sometimes. Unpredictable actually. It can also be rainy but not cold rain still kind of summer like maybe just a little cooler. Our weather has been warming up so much it is hard to predict. As far as shoes whatever you would normally wear for walking that are comfortable. There are several quilt shops around Olympia Non are huge but they are very nice. Check out the web for their name and maps. They are also not too far apart but then Olympia is not very big either. I like Olympia it is a fun little town.
Enjoy,
Judy