Yes, spiders are cold-blooded, which means they are ectothermic. This means that their body temperature is regulated by the external environment. When it’s warm, they are more active, and when it’s cold, they slow down. This is a common trait among invertebrates, including insects and arachnids. It’s also part of why you might see spiders being more active during certain times of the day or year depending on the climate and region.