Heat training

Sometimes certain races demand that you not only train for the distance but also for the hot and/or sultry conditions during the race. Some extreme examples of such races are the bad water ultra and furnace creek cycling race, both held in death valley.
Staying in chennai right now, I can definitely assert that though I am not training well by running regularly, I am definitely heat training(by just sitting in my room) big time, what with day temperatures soaring to 42 C(108 F). The 42 degrees doesn't actually underestimate my heat endurance training because the humidity, which is more than 50% has also to be factored in so that the apparent temperature seems more like 46 C(115 F). Anyway, one more month here and I will be ready to tackle marathons like Chennai Marathon(which is held not so early in the morning and under humid conditions) or even the badwater, if I were to be fit enough for the distance of 135 miles which ofcourse, I am not.