The HR Manager,
______________ (Name of the company),
______________ (Address of the company),
Date: __/__/____ (date)
Subject: Leave application
This is to most humbly inform you that my name is ___________ (name) working as a ___________ (designation) in _____________ (department).
I am writing this letter to bring to your attention that it has been raining heavily for the last _____ (hours/days) and the weather conditions are becoming worse. So, I will not be able to attend office today due to the same reason.
I hope that you will understand my situation and approve my leave request. It would be highly appreciated if you grant me leave for one day. If you want to discuss this matter, please do not hesitate to contact me at any time.