Temple Dress Codes

Is there a certain code of dress for visiting temples? I don't want to offend anybody simply by how I dress.

Thanks.

No, there is not a dress code. Although temples are religious places, most people treat them as tourist sites, so it's completely normal to see people wearing jeans, shorts, etc.

If you are going to a special ceremony that seems formal then you may want to dress up but for normal temple visits it's not necessary.

There is no dress code for Japanese temples for visitors. I wouldn't go to a temple in bikini, though.
Buddha wouldn't have refused any companion taking interest in the path to Truth, even those in bikini.
In Jodo sect, there's even a Doctrine of Evil Persons as the Object of Salvation (Akunin Shoki Setsu). An ignorant Japanese or Gaijin who just came in jaw-dropping clothes but who had no bad intentions shouldn't be refused.

I do admit it wasn't a bikini, but I've worshiped at a temple in my bathing suit with no problem. I'm Japanese and I didn't even think it was unnatural. Of course, if you walk the city streets in your bathing suit, that's another story. I went directly from the beach, through the parking lot, to the temple (and then to the toilet and then back through the temple again).