Portland weather in May 2025

Expect daytime maximum temperatures of 19°C in Portland in May based on long-term weather averages. There are 9 hours of sunshine per day on average with 11 days with some rainfall and typically 57 mm of rainfall in the month.

  • 19°C maximum daytime temperature in May in Portland19
    19°C max day temperature
  • 9 hours of sunshine per day
  • 11 days with some rainfall in May in Portland11
    11 days with some rainfall
  • 7°C minimum night-time temperature in May in Portland7
    7°C min night temperature
  • 15 hours of daylight per day in May in Portland15
    15 hours of daylight per day
  • No heat & humidity in May in Portland0
    No heat & humidity
  • 57 mm monthly rainfall in May in Portland57
    57 mm of monthly rainfall
  • UV (maximum) index 6 (High) in May in Portland6
    6 (High) UV index

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The May 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 / mm)  |  Imperial (°F / inches)

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How hot is it in Portland in May?

Daytime temperatures usually reach 19°C in Portland in May, falling to 7°C at night.

How sunny is it in Portland in May?

There are normally 9 hours of bright sunshine each day in Portland in May - that's 60% of daylight hours.

Does it rain in Portland in May?

There are usually 11 days with some rain in Portland in May and the average monthly rainfall is 57mm.

Portland May sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Thursday, 1st May 2025 04:58 19:18
Friday, 16th May 2025 04:38 19:36
Saturday, 31st May 2025 04:26 19:52

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