What is 10-day?
1.
The 10 day weather forecast from the news- whether tv or internet.
n. the weather forecast.
v. to look up the weather report.
"hey dude, what'll the weather be tomorrow?"
"I don't know. I'll do a 10-day."
or
"what's the 10-day say?"
"it looks like it will be rainy and cold."
See