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May Weather in North Portland, United States

Last updated: June 24, 2025

In North Portland, United States, the average temperature in May is a mild 14°C (58°F). Expect a minimum of 2°C (36°F) and a pleasant maximum of 32°C (90°F). However, be prepared for some rain, as 58 mm (2.3 in) of precipitation is expected over 10 days. The air is quite humid too, with an average humidity level of 83%, adding a touch of tropical charm to your experience!

May Temperature in North Portland

In May in North Portland, the average temperature is 14°C (58°F). Maximums can reach 32°C (90°F) and minimums can be as low as 2°C (36°F). Be prepared for a wide range of temperatures, making it ideal for layering your clothing when traveling.

May Weather in North Portland: Daily Temperature Highs, Lows, and Averages

The chart illustrates May temperature patterns in North Portland, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In North Portland, May typically has an average temperature of 14°C (58°F), with highs reaching up to 32°C (90°F) and lows dropping to around 2°C (36°F).
JanFebMarAprMayJunJulAugSepOctNovDec424146515864697064534641
Data source: Temperature data for North Portland generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

May Precipitation in North Portland

In North Portland in May, the total precipitation amount is 58 mm (2.3 in), measured over a span of 10 days.

May Precipitation Trends in North Portland

The chart displays monthly precipitation patterns in North Portland, with values for each month alongside May’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how May’s conditions compare to those of other months. In North Portland, May typically receives around 58 mm (2.3 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec16317213511758466862105155184
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in North Portland

In North Portland in May, humidity is 83%. With an average temperature of 14°C (58°F), this humidity feels like a thick blanket enveloping you, making exploration feel heavier and sweatier, so be prepared for a slower pace while traveling.

May Average Humidity in North Portland

This chart illustrates the average monthly humidity levels in North Portland, with May’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In May, average humidity in North Portland is approximately 83%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%84%85%83%83%84%82%74%71%81%87%87%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in North Portland

In North Portland in May, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in North Portland.

Maximum UV Index Levels in North Portland for May

The chart shows the monthly maximum UV Index (UVI) for North Portland in May, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In May, the maximum UV index in North Portland typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec23569101087532
Data source: North Portland May UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How May Weather in North Portland Compares to Other Months

Weather in North Portland varies notably across the year, with each month offering distinct climate conditions. This page compares May’s weather to other months in North Portland, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in North Portland, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather5°C (42°F)163 mm (6.4 inches)85%low
February Weather5°C (41°F)172 mm (6.8 inches)84%moderate
March Weather8°C (46°F)135 mm (5.3 inches)85%moderate
April Weather11°C (51°F)117 mm (4.6 inches)83%high
May Weather14°C (58°F)58 mm (2.3 inches)83%very high
June Weather18°C (64°F)46 mm (1.8 inches)83%very high
July Weather21°C (69°F)6 mm (0.2 inches)82%very high
August Weather21°C (70°F)8 mm (0.3 inches)74%very high
September Weather18°C (64°F)62 mm (2.4 inches)71%high
October Weather12°C (53°F)105 mm (4.1 inches)81%moderate
November Weather8°C (47°F)155 mm (6.1 inches)87%moderate
December Weather5°C (41°F)183 mm (7.2 inches)87%low

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