Weekly Rewind: Desert heat records, defunding the police, building new school From dreading desert heat to celebrating Somerton's first high school DESERT SOUTHWEST (KYMA, KECY) - So while temperatures are rising, it is happening very slowly. The hottest day for Yuma, ever recorded was July 1995, at an impressive 124 degrees. Therefore, no, we are not setting records year after year, but generally speaking, the trend is most definitely upwards. The earliest day Yuma ever reached 100 degrees was back in March of 1916; and the latest in the year it has ever stayed in the triple digits was October 1959. But the greatest number of 100 degree days happened just last year. 148 Days exceeded 100 degrees, in 2020.