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PORTLAND, Ore. (KOIN) — Summer heat is on the rise once again as temperature forecasts put the Rose City back into the mid-90s later this week.
Portland has seen its fair share of 90-degree heat during the 2025 summer season. On average, a total of 15 days climb into the 90s each summer. This year, Portland has already seen 14 days in the 90s and could add several more days to that tally later this week.
This late burst of August heat could possibly be the final round of 90-degree temperatures in Portland. On average, the last 90-degree day is on September 6. Take this date with a grain of salt. The latest round of 90-degree heat was on October 5, 1980.
This comes as the month of September ramps up the cooling trend in the Pacific Northwest, as the average daytime high temperature falls to 77 degrees.
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Josh Cozart
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