Yes, but contrary to Rhun's Princess Bride reference, there were no actual trees near the swamp hut.
Will Girgal change his spell selection for subsequent days?
Assume that on an average day in this terrain it is very hot for about 4 hours, requiring 4 Fort saves to avoid taking 1d4 nonlethal damage each.
If you find shelter in a crevice instead of travelling you can avoid the need for the saves.
I assume that the native people must use tents to shield themselves during the hot hours.
Coming next week ... you may join a large caravan with nearly a hundred camels ... and yes, there will be combat!