 is ongoing tucson weather high today 103 degrees a 40 chance of afternoon thunderstorms increasing to 50 this evening overnight low 77 tomorrow 103 for your high and a 50 chance of storms daytime highs in the low 100s by friday chances of storms through at least the first part of next week it's 91 degrees with clouds overhead and rain showers falling or at least light sprinkles falling in parts of tucson now it's time to jump in tucson with grant krueger he'll be speaking with mike jetty