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April Weather in Portland, United States

Last updated: June 24, 2025

In April, the average temperature in Portland, United States is a brisk 10°C (50°F), with a minimum dipping as low as -4°C (25°F) and a maximum soaring up to 28°C (83°F). Expect about 110 mm (4.3 in) of precipitation spread over 12 days, while the air remains rich with an average humidity of 83%.

April Temperature in Portland

In April in Portland, the average temperature is 10°C (50°F). Maximums can reach 28°C (83°F), and minimums can be as low as -4°C (25°F). This variability makes it essential to pack for both warm and cold weather when traveling to Portland during this month.

April Weather in Portland: Daily Temperature Highs, Lows, and Averages

The chart illustrates April temperature patterns in Portland, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Portland, April typically has an average temperature of 10°C (50°F), with highs reaching up to 28°C (83°F) and lows dropping to around -4°C (25°F).
JanFebMarAprMayJunJulAugSepOctNovDec313439506069757367574235
Data source: Temperature data for 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.

April Precipitation in Portland

In Portland in April, the precipitation amount is 110 mm (4.3 in) over a span of 12 days.

April Precipitation Trends in Portland

The chart displays monthly precipitation patterns in Portland, with values for each month alongside April’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how April’s conditions compare to those of other months. In Portland, April typically receives around 110 mm (4.3 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec71102941101369212412510714190106
Data source: Precipitation data for April generated using information from the Copernicus Climate Change Service.
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April Humidity in Portland

In Portland in April, humidity is 83%. With an average temperature of 10°C (50°F), this humidity feels like a damp chill that clings to your skin, making outdoor exploration less comfortable and prompting visitors to seek cozy indoor activities.

April Average Humidity in Portland

This chart illustrates the average monthly humidity levels in Portland, with April’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In April, average humidity in Portland is approximately 83%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%85%85%83%75%74%65%62%66%79%87%85%
Data source: Humidity data for April generated using information from the Copernicus Climate Change Service.

April UV Index in Portland

In Portland in April, 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 Portland.

Maximum UV Index Levels in Portland for April

The chart shows the monthly maximum UV Index (UVI) for Portland in April, 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 April, the maximum UV index in Portland typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356910101098642
Data source: Portland April 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 April Weather in Portland Compares to Other Months

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

This table compares monthly weather conditions in Portland, showing how April’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-1°C (31°F)71 mm (2.8 inches)87%moderate
February Weather1°C (34°F)102 mm (4.0 inches)85%moderate
March Weather4°C (39°F)94 mm (3.7 inches)85%high
April Weather10°C (50°F)110 mm (4.3 inches)83%very high
May Weather16°C (61°F)135 mm (5.3 inches)75%very high
June Weather21°C (69°F)92 mm (3.6 inches)73%very high
July Weather24°C (75°F)124 mm (4.9 inches)65%very high
August Weather23°C (73°F)125 mm (4.9 inches)62%very high
September Weather19°C (67°F)107 mm (4.2 inches)66%very high
October Weather14°C (57°F)141 mm (5.5 inches)79%high
November Weather6°C (42°F)90 mm (3.5 inches)87%moderate
December Weather2°C (35°F)106 mm (4.2 inches)85%low

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