 Now, the latest forecast from the KFNX Penguin Air Plumbing and Electrical Weather Center. From the KFNX Weather Center, we have an excessive heat warning in effect. For this afternoon, sunny and hot with a high of 114. It'll be mainly clear tonight, low 88. Sunshine for Tuesday, high 114. Mainly clear Tuesday night, low 88. Wednesday and Thursday, sunny, hot days, highs each day, 114. Currently in downtown Phoenix, it's 113 degrees.