KGW has issued Weather Impact Alert Days for July 5-9 due to high temperatures raising the risk of heat stroke and the impact to holiday weekend plans.

PORTLAND, Ore. — Portland is in the midst of its first heat wave, and hopefully the last of this intensity and duration, of summer. It started July Fourth and is expected to last through at least Tuesday.

KGW is calling Friday through Tuesday Weather Impact Alert Days due to temperatures that are forecasted to reach 100 degrees or higher.

KGW Chief Meteorologist Matt Zaffino said this is going to be a long-duration heat wave. Starting Friday, temperatures could reach or exceed 100 degrees for five straight days. Night-time temperatures in the upper 60s and low 70s over the weekend through Tuesday morning may also set records for the warmest overnight lows.

When

Starting with the holiday on the Fourth of July, temperatures will rise into the mid-90s. The National Weather Service issued an Excessive Heat Warning for portions of northwest and west central Oregon and southwest Washington that started at noon on Thursday and lasts until Monday at 8 p.m.

The hottest temperatures are expected over the weekend and at the beginning of next week. High temperatures could reach or surpass 100 degrees on Friday, Saturday, Sunday, Monday and Tuesday. All five days could potentially set new records. Here are the current records for high temperatures on those dates:

  • July 5: 98 degrees (2023)
  • July 6: 97 degrees (1960)
  • July 7: 95 degrees (2010)
  • July 8: 98 degrees (1952)
  • July 9: 96 degrees (1985)

Impact

The weather impact of high temperatures potentially reaching and exceeding 100 degrees will increase the possibility of heat stroke, fatigue and dehydration.

Need

If you have outdoor plans for the holiday weekend, make sure you're planning to pack extra water and stay hydrated. Keep updated with daily forecasts as KGW meteorologists track the risk factor.

What are Weather Impact Alert days?

It’s our goal to make sure you have the most accurate and up-to-date information about the weather and its impact on you. The new KGW Weather Impact Alerts will be just that, alerts as far in advance as possible, so that you can be armed with accurate information to keep yourself and your family safe.

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