In the tropics it's going to be very warm year-round. In the deserts near me, it is hot in the late spring, the summer, and early fall. In the hottest months (June, July, August and September) the high temperature you give would qualify as a cool day. The highs in those months might range from 33C (at the lowest) up to 50 C. That low (26 C) is pretty typical, but during the hottest times it may stay at 40 C or more until midnight. I seem to recall that Death Valley may have had a LOW temperature of 40 C one time last year (probably a record). Anyway, if you go to a desert in the hot season, don't expect it to be cold at night. I do know of places where the temperature might drop 30 C at night, but those are usually in the high desert where the air is very dry and there is cold air drainage of nearby mountains at night.
During the winter months, our deserts would typically be 20-25 C in the day, and 0-10 C at night.
Oikoo is right. I would say that rainforests tend to have less difference between high and low temperature than deserts but beyond that, it would be hard to answer your question.
There are rainforests and rainforests. Not all of them are tropical. The state of Washington has some extensive ones. Similarly, there are hot deserts (Sahara, Arabian) and cold ones (Gobi). According to some definitions, you would also have to call the polar regions deserts too. There are just too many variables to allow a meaningful answer.
Deserts tend to be cold, not warm.
I really want to know this, where I live 33C high 26C low day and night in summer, and not much different in winter, how does this compare to somewhere like Saudi Arabia where day temps can rise 48C but colder at night and colder in winter.
which would be hotter on average.
