Friday, May 22, 2026, brought clear skies and a mild start across Phoenix, but the easy morning will not stick around for long. The valley is on a steady climb into a hot holiday stretch, with a high near 96°F Friday, upper-90s on Saturday and Sunday, and a peak near 98°F on Memorial Day, Monday, May 25. Overnight lows will mostly hover in the low 70s, so evenings will offer only a short break from the heat. If you have outdoor plans, keeping water close is not optional.
Afternoon Heat And Low Humidity
The air mass over the region will stay very dry, with afternoon humidity tumbling into the 10–20% range and only minimal recovery overnight. That kind of dryness can make sunshine feel even harsher than the thermometer suggests. Winds should remain on the light side, around 0–5 mph with the usual afternoon bump, so the main story is the heat, not gusty breezes. Forecasters also see just a trace chance of measurable rain through the entire holiday weekend. According to the National Weather Service, highs will sit in the mid- to upper-90s today and through Memorial Day.
Fire Weather Risk In The High Country
While the Phoenix metro stays bone-dry, forecast models show a slight chance of isolated thunderstorms over Arizona’s higher terrain early next week, with Monday looking like the most favored day. Those storms would likely squeeze out very little rain. With limited moisture expected, any lightning in the high country could be on the dry side and may spark new wildfire starts in remote areas. If you are heading into the mountains, it is a good time to skip the campfire and keep tabs on updated forecasts and park notices. Valley barbecues and local events, however, are unlikely to feel any effects from those high-country storms.
Stay Cool And Plan Ahead
The city has a heat-response plan in place, along with a network of cooling centers and hydration sites ready for anyone who needs a break from the temperature spike. For locations and hours, check the City of Phoenix, and call 2‑1‑1 if you need help finding a cool spot. Practical moves are straightforward: avoid heavy outdoor work from late morning through mid‑afternoon, carry water, keep an eye on older neighbors and pets, and never leave people or animals in parked cars. If your Memorial Day plans include desert trails or mountain escapes, stay on top of the latest forecasts and park alerts before you head out.
