They all mean essentially the same thing. English can be weird like that, we have different words that mean the same thing. Weird is more commonly used, especially in informal situations like talking with friends, but if you're in a job interview for an example, you will generally not be looked down on if you say "that's weird" instead of "Thats strange" or "that's odd". I hope I helped :)

I would say they are all interchangeable and probably indistinguishable in their uses. You could just use the word "odd" whenever something seems peculiar to you and be just fine never using "weird" or "strange". However, when I use them, I feel they each imply something subtly different with each one. This is all my opinion just from experience: "odd" seems more like something doesn't fit. One example is that an "odd number" in English means it doesn't split equally into 2 groups (examples: 1,3,5,7,9) "weird" seems more like something is "wacky" or when something is too "silly". "strange" seems more like there is a little bit of mystery to it. Examples: odd I found it odd that Betty's house was the only house on the block without a driveway. weird I found it weird that Betty's house was painted bright pink. No one does that! strange I found it strange that Betty said hello to everyone except me. Maybe she is mad at me? So even though all of those words can be interchanged. I tend to use those words in those types of contexts; however, it wouldn't make much of a difference I used "odd" "strange" or "weird" for each one.

They're all synonyms and can be used interchangeably. "Weird" is more informal than "strange" and "odd"!