Clouds, humidity and a sticky start are hanging over Phoenix this morning, with temperatures around 84°F (29°C) at Sky Harbor. A few scattered showers and thunderstorms are on the table early Saturday, July 18, especially near sunrise, but most of the Valley is likely to see only quick, hit-and-run downpours.
Today
There is about a 30% chance of showers and thunderstorms before mid-morning Saturday, July 18, before conditions dry out and skies turn partly sunny for the afternoon. The high should land near 96°F. Winds will stay light, around 5 mph, but the moisture in the air will keep things feeling muggy, and any storm that does pop could briefly dump heavy rain and knock down visibility on area roads. This setup lines up with the latest guidance from the NWS Phoenix.
Next Week
Monsoon moisture is expected to build back in early next week, with the best odds for showers and thunderstorms shifting into the lower deserts on Tuesday and Wednesday, July 21–22. High temperatures rebound into the triple digits Monday and Tuesday, with forecast highs around 101–102°F on Monday, July 20 and Tuesday, July 21, and could climb into the mid-106s by Thursday, July 23 if the subtropical ridge edges west. For a broader look at this month’s heat pattern, check out how Phoenix turns into steam room.
Impact and Tips
Plan on possible quick disruptions to outdoor plans this morning. Brief, localized downpours could make streets slick and cut visibility for Saturday morning commuters, but widespread flooding is not expected today. Looking ahead to the week, if you have evening plans outdoors, keep an eye on updated forecasts and bring water, since temperatures are projected to climb back above 100°F by Monday and Tuesday. Check on vulnerable neighbors and try to avoid strenuous activity during the hottest afternoon hours.
Outlook
Through the weekend, showers and storms will favor the high country, while the Valley deals with only spotty activity until early next week. Nights stay on the muggy side, with overnight lows holding in the low 80s. Updates will follow if storm coverage increases or if any advisories are issued.
