Well I think I am going to go for it and see what happens. Seeds are reasonably cheap. I have purchased perennials late like August and planted them and they did fine. Hopefully with the warm weather the seeds should pop and grow quickly. Our first frost doesn't happen until usually late October. I will just have to make sure they get watered all summer. I searched on the internet read a couple of articles that says you can plant the seeds in the garden soil in the fall and you will have blooms the second year. Think I will plant in pots now and overwinter the pots in raised beds.
Of course you can start seeds over the summer.
Fall might be better in very hot climates.
I sow Biennials in June and July.
In cold climates, a good mulch will help the seedlings to winter over.
We can not always do gardening when it is supposedly, supposed to be done,
and must work around our own lives as best we can.
Experimenting is part of gardening too.
Sure, sow in summer! I have sown as late as the first week in July with great success. You likely won't get blooms this year though. I find there is just too much to do in the early spring and I find it much more enjoyable sowing perennials now. I start them in small flats in my greenhouse and transplant them out into the garden when they are big enough to handle (maybe a couple of inches tall) and there is rain in the forecast.