vivekw, we have come out of the hottest summer in a predicted 1,000 years here in Adelaide, South Australia. We had overnight lows of 35 to 38C !!!!!!
At present I have about 6 out of 20 odd cyms in spike and maybe more, as some of the new growths
may be spikes, just need a few more days to be sure.
So, yes, you can grow them in hot conditions.
After our 3 1/3 weeks of 38C+ temperatures, we had a sudden temperature drop to 9 to 15C over night with occasional rain which is what I think spurred them along.
Check my reply to this thread,(
Question about Cyms) it may help as well.