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Weather in September in Portland, Oregon

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maximum temperature iconNormal Max/ High Temperature 24°C (75°F)
average temperature iconAverage Temperature 17°C (63°F)
minimum temperature iconMin/ Low Temperature 11°C (52°F)
rainfall iconNormal Precipitation 44mm (1.7in)
rain days iconNumber of Wet Days (probability of rain on a day) 6 (20%)
sunshine iconAverage Sunlight per day 06:54
daylight iconAverage Daylight per day 12:29
sunny or cloudy iconSunny (Cloudy) Daylight Hours 56% (44%)
sun altitude iconSun altitude at solar noon on the 21st day.

  • The average temperature in Portland, Oregon is very mild at 17.4 °C (63.32 °F).
  • Afternoons can be fairly hot with average high temperatures reaching 23.7 °C (74.7 °F).
  • Overnight temperatures are generally quite mild with an average low of 11.1 °C (52 °F).
  • The range/ variation of diurnal average temperatures in September is 12.6 °C (22.7 °F).
  • The weather in September is a little parched with periodic rain. A mere 44.4mm (1.7in) of H2O accrues during an average of 6 days.
  • In September the skies in Portland, Oregon are fine with on balance a measurable 6:54 of bright sunshine per day.
  • The shortest day is 11:41 long and the longest day is 13:16 long with an average length of 12:29.
  • There are approximately 5:23 per day when bright sunshine is absent due to cloud, haze or the sun being too low on the horizon to register.
  • It is sunny approximately 56.1% of daylight hours and cloudy 43.9% of daylight hours.

Weather Trend Graph for September in Portland, Oregon, Usa

Graph of weather in Portland, Oregon in September

Portland, Oregon Weather in September Discussion


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