In all of the solar system, we have very reliable information on surface temperatures of nearly a THOUSAND objects.
The highest temperature ever recorded on Mars was around 70F, at noon, in the hottest part of the year, near the equator, in an area full of black rocks, deep in a valley where the atmosphere is thick enough that a person could probably stick their head outside with just a deep breath for life support. It was brief, too, the daylong average was below freezing and overnight was colder than Antarctica. And that's Mars's equivalent to blacktop in Death Valley.
...but yet the only reliable data we have for the most relevant of all other planets, Mars; is from 1977 and 1999 respectively. As far as a record of 70F for Mars, your friendly neighborhood wikipedia editor disagrees...35C.