你最好多带点衣服以防天气边冷(in case)

You better bring more clothes in case the weather is cold.

You better take more clothes along in case the weather gets cold.

You'd better take more warm clothes in case it becomes cold.

You 'd better take more clothes in case the wether is cold.

You better bring more clothes in case that the weather gets cold there.

比较直接的翻译。
可以简单地说：
Better take more clothers,for it may be cold there.——比较口语化。

You better take more clothes along in case the weather gets cold.