What does your girlfriend mean by going out to see the sky?

It has been pointed out that we should observe the weather before going out.

My girlfriend said that she would go out and look at the sky. What she meant was to observe the weather in front of the door. This is a common idiom, which means to know the weather before going out, so as to make corresponding preparations. This can avoid going out in bad weather conditions, such as rain, windy or too cold. Observing the weather can help your girlfriend choose suitable clothes and travel arrangements to ensure the comfort and convenience of going out.