Verbseoul.
ㅂ irregular (adj)
무덥다mudeopdahot

To say hot politely in the present tense, use 무더워요 (moo-duh-wuh-yoh). Below is the full conjugation of 무덥다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
무더워
moo-duh-wuh
무더워요
moo-duh-wuh-yoh
무덥습니다
moo-duhp-sseum-nee-dah
Past
무더웠어
moo-duh-wuh-ssuh
무더웠어요
moo-duh-wuh-ssuh-yoh
무더웠습니다
moo-duh-wuh-sseum-nee-dah
Future
무더울 거야
moo-duh-ool- -guh-yah
무더울 거예요
moo-duh-ool- -guh-yae-yoh
무더울 겁니다
moo-duh-ool- -guhm-nee-dah

Other useful forms

Command Polite (세요)
무더우세요
moo-duh-oo-sae-yoh
Suggestion / Let's Polite (요)
무더워요
moo-duh-wuh-yoh
Question Polite (요)
무더워요?
moo-duh-wuh-yoh-?
Connective “and” — (고)
무덥고
moo-duhp-goh
Conditional “if” — (면)
무더우면
moo-duh-oo-myuhn
Noun form — (기)
무더움
moo-duh-oom