Rain
The work can’t start, or it would be a mess.
It’s coming down hard enough that I don’t want to start the exterior work today. I can do Thursday or wait until it clears Friday. Which do you prefer?
Weather / outdoor delay
Call the outdoor job before you show up wet or idle. Offer two times so they can answer in one reply.
Swap in days that are actually free, and the real reason.
Forecast is against us
You’re looking ahead, not already on site.
The forecast is ugly for this afternoon. Safer to push the outdoor job. I have Saturday morning if that still works.
Short
When they can already see the weather out the window.
Weather’s against us today. I’ll hold the job and text you two new times this evening.