We did ours at 9:30a and it wasn't too hot yet. The sun did make us squint a little bit, but we used the 1-2-3 open your eyes trick and that worked out great. We picked a morning time vs an evening time because we knew by evening we would be sweaty and have to take time out to reshower and change and the kids may be crabby, so we just got it done first thing before any of that could happen.