 has attributed it to some of the reasons why we haven't had to go into any sort of fire restrictions at all. Look for an increased chance of monsoon storms in southern Arizona this weekend. National Weather Service meteorologist Glenn Laders says temps will be in the 90s. If you want to cool off... Top of Mount Lemmon looks really nice. Temperatures in the low to mid 70s for daytime highs, although there are thunderstorm chances every day up on the higher terrain. Connie Weber, Arizona News Radio.