I left the car out in the sun yesterday it was 91 degrees. The temperature ended up being right around 85 which is the exact temperature you want to keep the bottle at at all times for your 950 PSI so I would say the bottle will never get that hot if I leave it in the car all the time so that worry is over.. today it's only supposed to be 78 and sunny I'm going to leave it outside and check the temperature again. Also going to put the pressure gauge in the car so I know the temp and psi