Like anywhere you camp, the weather at Pennsic can be unpredictable. In past years, the weather has ranged from the low 100's with 90% humidity to mid-50's with five inches of rain. Storms flare up and, sometimes, tents come down. This is all part of the Pennsic experience. Expect the unexpected. Some warm clothes are good to bring as are sun screen, a hat and lots of liquid. If you have precious items that will be lost if they get wet, don't bring them, or at least plan to have a plastic box or garbage bag to put them in in case of storm. Winds come up and occasionally a campsite will get drenched. Be prepared. Pennsic has policies for threatening weather and you will be kept informed in case of a bad storm.