July 29 in Portland
Weather forecasts run out after about two weeks. For any date further out than that, the honest answer isn't a single number — it's the range Portland actually delivers on this date, and how often.
On July 29, Portland, OR typically reaches 83°F, but has run anywhere from 73°F to 94°F in eight years out of ten. About 95% of July 29s see no measurable precipitation.
The odds on July 29
Odds computed from the last 30 years (1996–2025).
Highs around July 29 have warmed about 0.3°F per decade since 1973 — roughly 1.7°F across the record. The figures above are shifted along that trend to 2025, so they describe today's climate rather than the average of the last 52 years.
Where this comes from: 775 daily observations from PORTLAND KGW-TV, covering 1973–2025. We pool every day within 7 days of July 29 — a single calendar date has only about 52 readings, far too few to place a 10th percentile you'd want to trust.
Why it's not a plain average: A climatology computed straight across 1973–2025 describes the middle of that period, not today, so as a statement about the present it runs cold. We fit a trend on year and shift each observation to 2025 before taking the range. The probabilities use the last 30 years instead — shifting a temperature along a trend is well defined, shifting “did it rain” is not.
What this is not: Not a forecast. It is what Portland, OR has actually done on this date, which is the only defensible answer once you're past the two-week horizon where real forecasts stop. Data: NOAA NCEI GHCN-Daily.