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April Weather in Washington, United States

Last updated: June 24, 2025

In April, the average temperature in Washington, United States hovers around 9°C (48°F). Expect chilly extremes, with minimums dipping to -5°C (24°F) and maximums reaching a pleasant 28°C (83°F). You'll likely experience 131 mm (5.2 in) of precipitation over 14 days, accompanied by an average humidity of 78%. Be prepared for a mix of weather as you explore!

April Temperature in Washington

In April in Washington, the average temperature is 9°C (48°F), with a maximum that can reach 28°C (83°F) and a minimum that can drop to -5°C (24°F). This variation in temperature makes Washington an interesting destination for travelers looking to experience a range of weather conditions.

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 9°C (48°F), with highs reaching up to 28°C (83°F) and lows dropping to around -5°C (24°F).
JanFebMarAprMayJunJulAugSepOctNovDec283137485868737265554133
Data source: Temperature data for Washington 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 Washington

In Washington in April, the precipitation amount is 131 mm (5.2 in) spread over the course of 14 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 131 mm (5.2 inches) of precipitation spread over approximately 14 days.
JanFebMarAprMayJunJulAugSepOctNovDec74959013112010415111212515096119
Data source: Precipitation data for April generated using information from the Copernicus Climate Change Service.
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April Humidity in Washington

In Washington in April humidity is 78%. With an average temperature of 9°C (48°F), this humidity feels like a damp chill that clings to your skin, making outdoor excursions less enjoyable as you navigate the damp air.

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 78%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%82%81%78%70%69%62%65%68%74%82%80%
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 is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to 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 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356810101098642
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.
 TemperaturePrecipitationHumidityUV
January Weather-2°C (29°F)74 mm (2.9 inches)84%moderate
February Weather0°C (32°F)95 mm (3.8 inches)82%moderate
March Weather3°C (37°F)90 mm (3.5 inches)81%high
April Weather9°C (48°F)131 mm (5.2 inches)78%very high
May Weather15°C (59°F)120 mm (4.7 inches)69%very high
June Weather20°C (68°F)104 mm (4.1 inches)69%very high
July Weather23°C (73°F)151 mm (5.9 inches)62%very high
August Weather22°C (72°F)112 mm (4.4 inches)65%very high
September Weather18°C (65°F)125 mm (4.9 inches)68%very high
October Weather13°C (55°F)150 mm (5.9 inches)74%high
November Weather5°C (41°F)96 mm (3.8 inches)82%moderate
December Weather0°C (33°F)119 mm (4.7 inches)80%low

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