Seems like no matter where you are the weather has been pretty erratic lately, but according to Instructables user stickmop, it’s possible to accurately predict the weather by simply watching the bubbles in your coffee.
When you pour the coffee into your cup, watch the bubbles. If the bubbles move to the edge of the cup rather quickly, that’s a good sign. Expect clear skies for the next 12 hours. If the bubbles hang around in the center of the cup, get out your rain gear. You can expect rain in 12 hours. If the bubbles slowly move to the edge of the cup, you may get a bit of weather, but it should be clearing in a few hours. If you’ve managed to make a cup without bubbles, flop a spoonful of coffee back into your cup and make some more bubbles.
Whether it really works or not, it’s a great excuse to help yourself to a cup of coffee and see what happens!