That's fine. Wine yeast strains generally like to be warm- 80 is good for many of them!- but my house is 60, so I have some wine fermenting at 62. it's not really vigorous, but it's going! Most wine yeast have a big temperature tolerance, from 50s to 90s for many of them, so you're fine!
You're right- it just may take a lot longer.
Broken Leg Brewery
Giving beer a leg to stand on since 2006