Portland weather in August 2025

Expect 79°F daytime maximum temperatures in the shade with on average 10 hours of sunshine per day in Portland in August. Check more long-term weather averages for Portland in August before you book your next holiday to Oregon in 2025/2026.

  • 79°F maximum daytime temperature in August in Portland79
    79°F max day temperature
  • 10 hours of sunshine per day
  • 5 days with some rainfall in August in Portland5
    5 days with some rainfall
  • 54°F minimum night-time temperature in August in Portland54
    54°F min night temperature
  • 14 hours of daylight per day in August in Portland14
    14 hours of daylight per day
  • Low heat & humidity in August in PortlandL
    Low heat & humidity
  • 1.1 inches monthly rainfall in August in Portland1.1
    1.1 inches of monthly rainfall
  • UV (maximum) index 7 (High) in August in Portland7
    7 (High) UV index

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The August weather guide for Oregon (Portland) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Metric (°C)  |  Imperial (°F)

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How hot is it in Portland in August?

Daytime temperatures usually reach 79°F in Portland in August with low heat and humidity, falling to 54°F at night.

How sunny is it in Portland in August?

There are normally 10 hours of bright sunshine each day in Portland in August - that's 70% of daylight hours.

Does it rain in Portland in August?

There are usually 5 days with some rain in Portland in August and the average monthly rainfall is 1.1 inches.

Portland August sunrise & sunset times

Browse the sunrise and sunset times for Portland in August 2025. Select a month to view Portland sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Friday, 1st August 2025 04:55 19:38
Saturday, 16th August 2025 05:13 19:16
Sunday, 31st August 2025 05:31 18:49

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