If I had read this yesterday I would've said "no, that's silly". My S3 can last 2 full days, so this isn't a problem.
Then last night I went to bed with 65% battery, around the same as I always do. I use the silent vibration alarm as an alarm clock - works fantastic. I usually wake up with 60% or so. This morning it was dead. 0. Nothing. It had somehow used 65% battery through the night and I don't know what caused it.
I SUSPECT the Dark Sky app was having one of its many spaz outs. If it can't get the weather one time, then it sits and sucks up battery until you load the phone app to knock it out of this loop. So it'd be nice to confirm this.