The Bowl of The Winds chapters are more than just a simple errand Nyneave and her team are embarking on; it's an entire plot-line. A rather short one in contrast to the story's other plot-lines, but a plot-line nonetheless. Admittedly, however, it may have appeared something simpler at first glance.
Yes, finding the Bowl was significantly important, as the Dark One himself was responsable for the broiling weather: With so many of the Seal's shattered, his influence across the world is spreading, and the weather's the proof. A few Darkfiends question the weather, once it finally changes, wondering whether "the Great Lord's plans have gone astray" or something along those lines.
I'm nearing the end of Book 8 myself. I hope you enjoy it is I have.