Weather’s Influence on Fibromyalgia Symptoms. This.   I have a barometric pressure app on my tablet. Yes, it tells me the weather, the temperature and forecasts. My favorite part is the BP part. I don’t look at it much, until I start hurting very badly. Then I check and see if the BP is the cause. Sure as the world, the BP looks like a roller-coaster. On the other hand, if I am having a great day, I can look at the BP and it is close to flat-lining. So these studies are erroneous.