This is a real killer. People have no idea and tend to overestimate the risk from wildlife and underestimate the risk from weather conditions and exposure. Far more people are killed by hypothermia caused by extreme heat or cold than anything else in North American wilderness areas.
I’ve been part of my local SAR community here in Oregon for decades now and while we don’t have to worry so much about the heat, what gets people here is the cold.
If you are somehow lost or stuck in the high Cascades at night without adequate clothing or a heat source, you are in big trouble, especially if it rains or snows, both of which can and will happen even in the middle of summer.
River crossings are also a big danger since the current is always much stronger than it looks and the water is near freezing and if you fall in and don’t have dry clothes and it starts to rain and blow, you are fucked.