One that can help you is:
ΔT=TFinal−TInitial
That is of course adding both tmepratures. There is one more that is a lil bit more complex
Tf=Ti−ΔHrxn∗nrxn/(Cp,water∗mwater)
This one is taking into account that yu can find temperature and that there could be a change with a chemical reaction. Hope this helps