NWS Forecast Office Phoenix, AZ

Lower desert highs will creep up by about one degree per day through early this weekend, leading to locally Major HeatRisk developing as early as Friday. Saturday is shaping up to the be the hottest of the next 7 days, with some of the typically hotter locales reaching the mid-to-upper 110s and the most widespread coverage of Major HeatRisk. Be sure to stay hydrated, reduce outdoor activity between 10 am and 6 pm, and take breaks indoors in the A/C as much as possible.

Daily chances for shower and storms will continue through at least the next 7 days. By the latter half of this week, there will be increasing chances for more widespread activity, including for the lower deserts. The best chances for lower desert storms across South-Central Arizona begins on Sunday, with around a 35% chance of measurable rainfall each day into early next week for downtown Phoenix.

An Excessive Heat Watch has been issued beginning on Friday for the lower deserts of South-Central/Southwest AZ and Southeast CA. During excessive heat conditions, everyone can be vulnerable to the hot temperatures during the heat of the day, especially without adequate cooling and hydration. Additionally, overnight lows are forecast to be 90+ degrees Friday-Sunday in urban areas, so there will a be little relief from the heat. Continue practicing all recommended heat safety measures.