Temps could near 100 Sunday into Monday, perhaps the area’s first 100-degree heat of 2026.
Portland is bracing for its first serious heat of the year, and forecasters are urging residents to prepare now. The National Weather Service issued an Extreme Heat Watch today for the greater Portland and Vancouver area, warning of dangerously hot conditions with temperatures climbing toward 100 degrees this weekend.
The watch runs from Sunday into Monday evening and covers the Portland metro area, including parts of Clark, Multnomah, Clackamas, Skamania and Washington counties. If the forecast holds, it would deliver the region’s first 100-degree heat of 2026.
How hot it will get, and when
So far this year, Portland has recorded just one day in the low 90s. This weekend could be a sharp jump. The heat builds starting Saturday, with the weather service expecting three to four days at or above 90 degrees and the peak landing Sunday and Monday.
Forecasters put real, if uncertain, odds on triple digits. The weather service’s own forecast discussion gave inland valleys a 65% to 85% chance of topping 90 degrees on June 13-15, and a 10% to 30% chance of reaching 100 or higher on June 14-15. Sunday’s record high at Portland’s airport is 89 degrees, set in 1988, a mark forecasters say could fall by roughly 10 degrees.
Nights may offer little relief. The weather service expects overnight lows only in the mid to upper 60s, which limits the body’s chance to cool down and recover.
Why heat like this is so dangerous here
In much of the country, 100 degrees is a tough but routine summer day. In the Pacific Northwest, it can be deadly. Many homes lack air conditioning, and residents are less acclimatized to extreme heat, especially this early in the season.
The region learned that painfully in 2021. A record-shattering heat dome pushed Portland past 100 degrees for several days and killed nearly 100 people, most of them in Multnomah County. Since then, the area has expanded heat planning, including a program offering free air conditioners to residents.
What a heat ‘watch’ actually means
A watch is not the same as a warning. An Extreme Heat Watch means conditions are favorable for dangerous heat but the event isn’t locked in, which matches the forecast’s roughly one-in-three-or-lower odds of actually hitting 100. If confidence grows, the weather service can upgrade the watch to an Extreme Heat Warning, signaling that dangerous heat is expected or already occurring. KOIN has said it will activate a weather alert for Sunday and Monday as the heat peaks.
How to stay safe and where to cool off
Officials offer familiar but vital advice: drink plenty of fluids, stay out of the sun during the hottest hours, wear light and loose clothing, and never leave children or pets in a parked car, where temperatures can turn lethal within minutes. Check on elderly neighbors and anyone without air conditioning. For people who work outdoors, OSHA recommends frequent breaks in shade or air conditioning.
There are public options as well. During declared heat emergencies, Portland and Multnomah County open cooling spaces, and TriMet will not turn away anyone traveling to or from a cooling center. Portland’s splash pads turn on June 10, and the city’s interactive fountains run through the summer.
What’s next
Forecasters will refine the outlook as the weekend nears, and the watch could become a warning if the hottest scenarios firm up. For now, the message is to make a plan before Sunday rather than scramble once the heat arrives. The hot stretch is expected to ease early next week.
SOURCE: KOIN