They ferment best in the warmth(72 and above), so you are fine...I wouldn't place them in direct sun, but the warmth of your climate is definitely a bonus. I know vinegar cultures grow best in the dark and thought this is not much different, so I used dark buckets with the lid on but cracked open to expel any gas build up and to allow spores from the air into the mix. Stirring it every now and again helps aerate the mix but this will probably happen when you start your grains and each time you feed anyway.
I leave my working bucket right in the coop. Have to fight the CX chicks out of each time I feed....they will jump down into the bucket while I'm scooping the feed into the feeder.
Suffice to say, they really love their fermented feed and act like crazy beasts each time they get a refill.