April Weather in Washington, United States

Last updated: June 24, 2025

In April, the average temperature in Washington, United States hovers around 18°C (65°F). You'll experience a minimum of 1°C (34°F) and may enjoy highs reaching up to 32°C (89°F). Be prepared for 107 mm (4.2 in) of precipitation spread over 8 days, coupled with an average humidity of 81%.

April Temperature in Washington

In April in Washington, the average temperature is 18°C (65°F). Maximums can reach 32°C (89°F) and minimums can be as low as 1°C (34°F). Be prepared for a wide range of temperatures and pack accordingly for your travels!

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

The chart illustrates April temperature patterns in Washington, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Washington, April typically has an average temperature of 18°C (65°F), with highs reaching up to 32°C (89°F) and lows dropping to around 1°C (34°F).

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

April Precipitation in Washington

In Washington in April, the total precipitation amount is 107 mm (4.2 in), occurring over a span of 8 days.

April Precipitation Trends in Washington

The chart displays monthly precipitation patterns in Washington, 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 Washington, April typically receives around 107 mm (4.2 inches) of precipitation spread over approximately 8 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 Washington

In Washington in April, humidity is 81%. With an average temperature of 18°C (65°F), this humidity feels like a thick blanket wrapping around you, making every step feel heavier and the air thick and sultry—a challenging environment for traveling.

April Average Humidity in Washington

This chart illustrates the average monthly humidity levels in Washington, 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 Washington is approximately 81%, 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 Washington

In Washington in April, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in Washington.

Maximum UV Index Levels in Washington for April

The chart shows the monthly maximum UV Index (UVI) for Washington 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 Washington typically reaches 10, which falls under the very high exposure category.

Data source: Washington 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 Washington Compares to Other Months

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

This table compares monthly weather conditions in Washington, showing how April’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	9°C (48°F)	100 mm (3.9 inches)	86%	moderate
February Weather	12°C (53°F)	117 mm (4.6 inches)	84%	high
March Weather	14°C (58°F)	87 mm (3.4 inches)	83%	very high
April Weather	18°C (65°F)	107 mm (4.2 inches)	81%	very high
May Weather	23°C (73°F)	109 mm (4.3 inches)	81%	extreme
June Weather	26°C (79°F)	97 mm (3.8 inches)	81%	extreme
July Weather	27°C (82°F)	105 mm (4.1 inches)	83%	extreme
August Weather	27°C (81°F)	125 mm (4.9 inches)	81%	very high
September Weather	25°C (77°F)	98 mm (3.9 inches)	82%	very high
October Weather	20°C (68°F)	112 mm (4.4 inches)	78%	very high
November Weather	12°C (54°F)	82 mm (3.2 inches)	86%	high
December Weather	10°C (50°F)	117 mm (4.6 inches)	89%	moderate