Over here, rebloomers kick off blooming when the temperatures go down from the 100s. Roses too. That translates sometime near the end of September. Very nice that you got two blooming periods close together!

We were wet this summer-dry Sept and now wet again. TS is full of buds as is ES. Summer cooler than normal-that I think helps.

It hapened to me with a gardenia that rebloomed in July-August due to weather conditions! I was floored and enjoyed it a lot.