Weather in Portland in July

Prime time. If you get to pick your dates, July is the one. Highs average 28.3 °C, lows 13.5 °C, and rain falls on 3 days — nothing in the month is working against you.

July is the highest-scoring month of the twelve. The nearest rival is September, and the month at the other end of the year is December.

Rain falls on only 3 days, so an itinerary with no wet-weather fallback is a reasonable risk. Pack for 28.3 °C days and 13.5 °C nights; the spread matters more here than any single number.

What the averages hide

Averages flatten a month, and this one hides a few things: 10 days top 30 °C — hot spells arrive, but they break. Across the twenty years measured, the hottest July day reached 42.2 °C and the coldest night fell to 8.6 °C.

July is moderately variable: 1 mm in the driest year against 29 mm in the wettest, around an average of 11 mm. Roughly two Julys in three land near that average, and the third does something else entirely.

Wind is light at 2.7 km/h, so the temperature on the page is close to the temperature on your skin, and humidity is unremarkable at 70%.

How July sits in the year

The month is on the way up: 6.1 °C warmer than June, and August adds another 1.6 °C. Late in the month feels noticeably different from the start of it, which is worth knowing if the trip is short. Rain has already shifted: 7 days fewer than June had.

Daylight in July

July is at or near the longest days of Portland's year: 15.4 hours of daylight, losing 0.8 hours across the month. Evenings are the real gain — dinner outdoors still happens in full light.

An inland climate

With no coast nearby, the year swings a fair way — 27.7 °C between the warmest afternoons and the coldest nights, wider than any coastal city at this latitude would manage. Within July itself the daily swing is 14.8 °C, so mornings and afternoons need different clothes.

How busy it gets

Peak season. Expect the highest prices of the year and to be booking well ahead.

Crowd levels are estimated from climate desirability and school-holiday calendars, not from visitor numbers.

July in Portland versus nearby

If Portland is one option among several, the nearby comparison is worth making. Eugene is close enough to be a coin toss — 2.6 °C cooler, 1 day less rain. Seattle is close enough to be a coin toss — 4.8 °C cooler, 1 day more rain.

So: July is the answer for Portland. If it is booked out or priced out, September is the next best thing at 3 points behind, and December is the month to keep off the shortlist.

Every month in Portland

See all twelve months in Portland, or where else to go in July.