April Weather in Portland, United States

Last updated: June 24, 2025

In April, the average temperature in Portland, United States is a cool 10°C (51°F), with temperatures ranging from a minimum of -7°C (20°F) to a maximum of 29°C (84°F). Expect about 93 mm (3.7 in) of precipitation spread over 12 days, contributing to an average humidity of a damp 87%.

April Temperature in Portland

In April in Portland, the average temperature is 10°C (51°F). Maximums can reach 29°C (84°F) and minimums can be as low as -7°C (20°F). This wide temperature range means travelers should prepare for both warm days and chilly nights.

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 (51°F), with highs reaching up to 29°C (84°F) and lows dropping to around -7°C (20°F).

Data source: Temperature data for Portland generated using information from the Copernicus Climate Change Service.

April Precipitation in Portland

In Portland in April, the precipitation amount is 93 mm (3.7 in) over the course 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 93 mm (3.7 inches) of precipitation spread over approximately 12 days.

Data source: Precipitation data for April generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

April Humidity in Portland

In Portland in April humidity is 87%. With an average temperature of 10°C (51°F), this humidity feels like a heavy blanket enveloping you, making outdoor activities uncomfortable and sticky, and often requiring frequent breaks to stay hydrated and cool.

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 87%, offering insight into how humid the weather typically is during this month.

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.

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.
	Temperature	Precipitation	Humidity	UV
January Weather	-2°C (29°F)	74 mm (2.9 inches)	85%	moderate
February Weather	0°C (32°F)	88 mm (3.4 inches)	85%	moderate
March Weather	5°C (42°F)	101 mm (4.0 inches)	86%	high
April Weather	10°C (51°F)	93 mm (3.7 inches)	87%	very high
May Weather	17°C (63°F)	127 mm (5.0 inches)	81%	very high
June Weather	22°C (73°F)	114 mm (4.5 inches)	82%	extreme
July Weather	24°C (76°F)	101 mm (4.0 inches)	81%	very high
August Weather	23°C (74°F)	102 mm (4.0 inches)	79%	very high
September Weather	20°C (69°F)	75 mm (2.9 inches)	78%	very high
October Weather	14°C (57°F)	97 mm (3.8 inches)	81%	high
November Weather	5°C (42°F)	82 mm (3.2 inches)	89%	moderate
December Weather	2°C (35°F)	67 mm (2.7 inches)	86%	low