This is a nice prompt: a cup of coffee on rainy days. It is very comforting and curl up with a warm mug of coffee in your hand while listening to the sound of the rain. I love that feeling. It's like a me time for myself. Coffee on rainy days improves my mood and just comfortably relax on my favorite chair/sofa and just curl up.
For me, it can lift up my spirits on gloomy days. Coffee makes my day, any day of the week, month, or year.