i a making nfsc with RI for this Saturday-July 12th.. It should be about 90 degrees.. I'll let you know how my cookies hold up!
RI is perfect for heat. Once dry- rock hard (which is why some don't like it). In humidity though, I once had an issue because I stacked them, and they "stuck" together a bit (after a day- in home only). So as long as they are wrapped, or separated (if they stay out long) you will be fine.
I am thinking of donating some decorated sugar cookies to a festival our church is having in a few weeks. It'll probably be 90 degrees that day... will Royal Icing hold up to that heat?
It's not the heat you have to worry about. It's the humidity. When I make royal icing pieces, I put them in the oven to speed up the drying process.
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