Is this a performance shirt for hot weather?

No. It is a casual cotton-blend graphic tee. It does not wick moisture or carry a UPF rating, so look at a dedicated fishing or sun shirt if that is what you need.

It is cut relaxed through the body with short sleeves. Most buyers stick with their usual size; size up if you want a looser, untucked look.

Will the print crack or fade?

Screen-printed graphics on cotton blends typically hold up for a long time if you wash cold and tumble low. Hot water and high dryer heat are what shorten a print's life.

Is it worth it over a plain tee?

You are paying for the artwork and the Yeti label. If you like the design and the brand, it is a reasonable casual shirt; if you just want a basic tee, cheaper options do the same job.