This paper is devoted to the computer simulation of OH band at 306.357 nm (transition A2Σ, ν = 0 → X2Π, ν′ = 0) for both a given rotational temperature and an optical apparatus function profile, when existing data at a reference temperature are known. This kind of numerical simulation may be of great interest for spectroscopic temperature determinations in flames and hot gases containing the OH radical, by direct comparison of experimental data with a simulated spectrum.