Almost impossible to say. Depends on what kind of container soil you are using, your fertilizing regime and the weather conditions going forward. Pumpkins need a lot of heat for the fruit to develop, mature and ripen and that is a bit iffy in most parts of the country in mid September. You are about a good three months out from harvesting anything so that puts you close to Christmas time..........I wouldn't think your chances for much of anything are very strong. Sorry.

This is a month after I started germinating. It rains daily (I water them in the AM) and they get about 12 hours of sunlight. Already seeing buds on this one. th The other is a bit smaller, but still growing.

I'm using organic compost with some potting soil with fertilizer in it.

Also it should remaim above 85 for the next month and then low 80s into November.