Originally Posted by yonder
I hope there will be some cool water around West Yellowstone in mid september..........
Mid September used to be reliable good conditions but last few years its been hot! But the weather is much different in W MT than in Yellowstone. You'll be fine.
Last night was only the third time in recorded wx history that the low temp in Missoula did not get under 70! Its still 92 at 6:45pm.