Making the world better, one answer at a time. The average Human body can withstand about 50 PSI blast pressure meaning sudden impact. As far as sustained pressure the human body can withstand as much as 400 PSI providing it is gradually increased to this amount.n individual's ability to withstand these temperatures will depend greatly … on other influences such as age, location, overall physical condition, etc.   * 39°C (102.2°F) (Pyrexia) - Severe sweating, flushed and very red. Fast heart rate and breathlessness. There may be exhaustion accompanying this.