Phoenix is about to skip spring and jump straight into summer. Sunny skies and a high near 90°F are expected on Sunday, March 15, but that pleasant stretch will not last long, as a major early season heat wave is forecast to arrive midweek, pushing temperatures into the triple digits and keeping evenings warm across the Valley.
Extreme Heat Watch
The National Weather Service in Phoenix has issued an Extreme Heat Watch from Thursday morning, March 19 through Sunday evening, March 22, as a strong high pressure ridge builds over the region. According to the National Weather Service Phoenix, parts of south central and southwest Arizona could see afternoon highs between 103°F and 109°F during the watch.
What To Expect This Week
Temperatures climb quickly after Monday. Forecasts show upper 90s on Tuesday, with the first triple digit day likely on Wednesday, March 18, when highs could reach roughly 100–102°F. The warm spell intensifies Thursday and Friday, with highs forecast near 104–107°F and overnight lows only dipping into the 60s or low 70s, which limits nighttime recovery and keeps homes and streets feeling hot around the clock.
Where To Cool Off
The City of Phoenix is activating its heat response plan and will keep 24/7 and extended hour cooling and respite locations open, including a 24/7 respite center at 20 W. Jackson Street and partner sites such as Justa Center at 1001 W. Jefferson St. For hours, locations and transportation help, see the City of Phoenix heat response page.
How To Stay Safe
Residents are urged to take extra precautions now. Reschedule strenuous outdoor work to early morning or evening, drink water frequently, wear loose light colored clothing, and avoid prolonged sun exposure. Check on older neighbors and anyone without reliable cooling, and consider visiting a cooling center if your air conditioning fails, since heat related illnesses tend to rise sharply during multi day heat events.
