No telling....but there is a last ditch effort to flower and reproduce sometimes.

Forsythia will sometimes bloom a bit in the fall. I don't know what causes that. We had a colder winter than we have had in several years. I think all my crepe myrtle will be coming up from the bottom. Plants that made it through winter for years have been damaged this year. If you like your bargain forsythia, it is easy to propagate. You can take cuttings and keep them watered until the small plants have a root system. Or you can bend some branches down weight them down with a rock and the branch will probably grow roots. We are in a drought. Small plants take more care so if you do this keep them watered. Some improved varieties of forsythia have larger brighter flowers so you may want to invest in an improved one. The cost of a small shrub of something as easy as forsythia may be worth it. The ones from the grocery store may be fine though.