Anyway, the weather! (always an easy topic for small talk)
There are zillions of weather idioms in the English language, but I'd like to introduce here the ones I found more useful:
-TO FEEL/BE UNDER THE WEATHER: not to feel very well. Feel sick
- TO HAVE THE HEAD IN THE CLOUDS: to have unrealistic ideas
- TO HAVE A FACE LIKE THUNDER: to be really angry
- IT NEVER RAINS BUT IT POURS: to have really big problems
- TO CHASE RAINBOWS: to go after something that will never happen
- A STORM IN A TEACUP: a person exaggerates their problems
- EVERY CLOUD HAS A SILVER LINING: there is always something positive about it