Best time to visit Portland

Portland is a city of two halves. July scores 89 and December scores 26 — a 63-point swing, which is the difference between a holiday and an endurance test. The month you pick matters more here than almost anywhere. The good window runs June to September — 4 months within ten points of the best.

August is the warmest month at 29.9 °C and December the coolest at 7.7 °C — a 22.2 °C spread across the year. Around 34 days a year top 30 °C, concentrated in August and the months either side. 26 nights a year dip below freezing.

There is a real wet season here. January, March, April, November and December carry the rain — up to 20 wet days in a month — while July to September drop as low as 3. That 17-day gap is the biggest single difference between a good month and a bad one in Portland, and it moves further than the temperature does.

Daylight runs from 8.7 hours in winter to 15.7 in summer, enough to notice on a sightseeing itinerary.

The three strongest months are July, September, June. The one to think twice about is December. Each month below has its own page with rainfall reliability, extremes, daylight and crowd levels.

Portland month by month