This is a stand-alone spinoff from the modular datalogger project that I described on 2021-06-02. The "annunciator" module of that project allowed weather (or other) data to be shown on an eInk screen. Now I have replaced that module with one built around a 3.5" ILI9341 TFT display. The new module shows weather data, but in between the weather reports it shows arbitrary photo images, drawing upon an effectively unlimited number of BMP files saved on its Teensy's µSD card. I have described it here.
Sounds like fun: Would be good to post some images here and the like.
Did visit your site, but don't like to click on too many external links...
I think I have something similar to this, although I don't display any weather stuff. But it does also support JPEG and GIF files.
I have copies of it as examples in several of the display libraries like in: ILI9341_t3n