Usually, you have a choice. It's your choice.
I bet even weather professionals don’t ever say that there is 0% chance of rain tomorrow–nor do they say there’s 100% chance. Isn’t that nature of chance? You just don’t know. That’s a good thing.
Is there always a chance? Let’s see, there’s not a chance I’ll live to 412 years old. There’s not a chance my dog will jump over a mountain tomorrow. There’s not a chance tomorrow is the same as today.
Read the full article to see how many you need to have a chance: A Chance of Rain is Still a Chance.