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Weather in September in Portland, Oregon

< September >
Normal Max/ High Temperature C ( F) 24 (75)
Average Temperature C ( F) 17 (63)
Min/ Low Temperature C ( F) 11 (52)
Normal Precipitation mm (in) 44 (1.7)
Number of Wet Days (probability of rain on a day) 6 (20%)
Mean Sunlight Hours/ Day 06:54
Average Daylight Hours & Minutes/ Day 12:29
Percentage of Sunny (Cloudy) Daylight Hours 56 (44)
  • It is sunny approximately 56.1% of daylight hours and cloudy 43.9% of daylight hours.
  • 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.
  • In September there is a variation/ range of mean daily temperatures of 12.6 C (22.7 F).
  • Afternoons can be fairly hot with average high temperatures reaching 23.7 C (74.7 F).
  • The skies in Portland, Oregon are fine with on average a measurable 6:54 of brilliant sunshine daily.
  • The weather in September is a little parched with periodic rain. A mere 44.4mm (1.7in) of water is discharged across an average of 6 days.
  • The shortest day is 11:41 long and the longest day is 13:16 long with an average length of 12:29.
  • Overnight temperatures are generally quite mild with an average low of 11.1 C (52 F).
  • The mean temperature in Portland, Oregon is very mild at 17.4 C ( 63.32 F).

Weather Trend Graph for September in Portland, Oregon, usa

Graph of weather in Portland, Oregon in September

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