Weather conditions vary widely across the country during Halloween. In the Northeast, high pressure often brings pleasant temperatures, but it can get chilly after sunset. In the South, showers and thunderstorms may be a concern, especially in areas like the lower Mississippi Valley. The Midwest may experience mild temperatures but could also see rain or even thunderstorms. Meanwhile, the West often faces wet conditions, with rain and even snow in higher elevations like the Sierra Nevada. Knowing your region's typical Halloween weather can help you plan effectively.