NWS Forecast Office Phoenix, AZ

Well above normal temperatures will continue through Friday resulting in areas of moderate to locally major HeatRisk across the lower deserts. Afternoon highs will be around 10 degrees above normal and near daily records across the western deserts. Temperatures will then rapidly fall to well below normal by the beginning of next week.

An unsettled weather pattern will develop this weekend and continue into next week. Multiple rounds of rain will be possible as an area of low pressure amplifies over the west coast combined with tropical remnants. The low will eventually move through the region during the beginning of next week. This will result in temperatures falling well below normal by the beginning of next week. Additionally, breezy to windy conditions are expected as the remnants of Tropical Cyclone Rachel move through the region Sunday.

October 5th is the average last 100 degree day of the year for Phoenix. The latest 100 degree day on record occurred on Oct 27th, 2016, so it is climatologically possible to see 100 degree days last through late October.