"Month" in Korean is wol (월). All you need to do is pair the numbers 1 to 12 in the Sino-Korean numbering system with this word, and you're all set!
If you are not yet familiar with the numbering system in Korean, here are some resources you can check out:
Months of the Year in Korean
- Il-wol (일월) 'January'
- I-wol (이월) 'February'
- Sam-wol (삼월) 'March'
- Sa-wol (사월) 'April'
- O-wol (오월) 'May'
- Yu-wol (유월) 'June'
- Chil-wol (칠월) 'July'
- Paek-wol (백월) 'August'
- Gu-wol (구월) 'September'
- Si-wol (시월) 'October'
- Sip-il-wol (시일월) 'November'
- Sip-i-wol (시이월) 'December'