I use an old 5 gallon pail for a blowoff container, keeps me from having to babysit. Mine (when I do hefes in a 6.5 gallong carboy) blows off even at 64-66F. Like Yuri said, the temp is going to effect the flavor a lot, and the blowoff not-so-much...
Good luck, though, I hope you have a tasty brew. Maybe call it "no more babysitting Hefeweizen"!
Primary - California Common -finally!
Secondary - nothing, back after year plus hiatus
Keg carbing & conditioning - nada
Drinking - store bought: Loose Cannon IPA, Wachusett IPA.
On deck: Trying to decide (beer); wine kit likely (red wine)