It could mean there are a lot of spiders where you are.
Wherever you are, there are spiders. This is not meant as a statement of significance; it is a fact. Spiders outnumber humans by an incredibly significant number, and they live in almost every environment.
Seeing spiders a lot can simply be coincidence. If you are experiencing cooler temperatures right now (as in, it's currently late autumn in the Northern Hemisphere), or if outside is prohibitively hot, or even simply if you have been receiving a lot of precipitation, spiders are more likely than usual to migrate indoors, where the humidity and temperature are kept more consistent. Spiders also like all of the nooks and corners in houses, as they are good places to build webs. It's not like arachnids to environmental studies and analyses of insect population distribution to build in an optimal location; they find a place which seems suitable, and string up a web.
That said, if you do believe that there is some significance to your spottings of spiders, that answer is more up to you than anyone else. More often than not, beliefs about animals regarding superstition, synchronicities, etc., is based on behavior out of the ordinary for the animal.
Spiders are everywhere. If you pay attention to them, you will notice them more.
Maybe the tarot is trying to tell you that someone is weaving a web for you. Might indicate you're walking into someone's trap. It really depends on the reading. Is there any card that you see often that catches your attention? Anyways, be careful. And for gods sake buy some anti-insect chemicals and spray the whole house.