You should have no problem with a MacBook in India. The temperatures in India do not even compare with many places in the United States. There are many places in the United States that regularly get temperatures over 45 degrees celsius. For example, here are some temperature records per state: Arizona: 53 degrees celsius, Arkansas: 49 degrees celsius, California; 57 degrees celsius, Kansas: 49 degrees celsius, Navada: 52 degrees celsius, New Mexico: 50 degrees celsius, North Dakota: 49 degrees celsius, Oklahoma: 49 degrees celsius, South Dakota: 49 degrees celsius, and Texas: 49 degrees celsius. Comparatively, the highest temperature I was able to find in India was 47.6 degrees celsius. As you can see, this is not even close to 10 of the US states. Imagine telling those living in the above states that they could not own a Macbook because it was too hot where they live.
Also, a temperature of 45 degrees celsius in India represents the highest temperature of the day on a rare day. So most of the time during that particularly hot day (nighttime, morning, and evening) the temperature is much lower. And most days of the year the hottest point of the day will not reach 45 degrees celsius.
I have lived with my trusted iBook in climates much hotter than that of India for over three years and my iBook is doing just great. Good luck.