In S.F. There is plenty of time for the plants to mature & provide flowers SO go ahead & plant the seed

I've grown seeds from that very same packet "Bring Home the Butterflies" (from Botanical Interests), and I live in San Francisco too. It's a great mix packet! Comes with so many different types, and lots of them too. I still have a bunch. Since those seeds come from all different climate zones, you don't need to worry about planting them too early or too late. In San Francisco, you can plant them pretty much any time of the year.

I would recommend though, if you want to only plant a few types from that mix, that you look up information on those plants so you can give them the most suitable environment, because they are all different. (For instance, some plants might need darkness to germinate, some might need light, etc, some might need part shade, etc.) I know the packet is designed for the gardener to just toss a bunch of seeds on the ground and let nature do the rest, but I've planted mine separately just because I wanted to have individual plants, not a big crowded pot.

Two years ago I first planted my butterfly seeds in the middle of summer and I had flowers all the way up until Christmas time. There will always be late-season bugs happy to find a home in your plants.