Guy-Lussac law. At a constant volume, P1/T1=P2/T2. T is in Kelvin. Solving for P2, the equation becomes P2=P1T2/T1. Let’s say that T1=293°K (20*C or 70°F), P1 = 100 psi, and T2= 313°K. Plug and chug to get 107psi. Pretty close to ofajen’s estimate.
Now let’s assume that the absolute maximum pressure...the blow off point...is 150 psi. How hot would it have to get to reach that pressure? This time solve for T2. T2=P2T1/P1. Plug, chug and T2 is 440°K or 166°C or 330°F (for the metrically challenged). If it gets that hot, you got other things to worry about!