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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 12°C (55°F). However, be prepared for a range of temperatures—minimums can dip to -4°C (25°F), while maximums can soar up to 30°C (86°F). Expect 143 mm (5.6 in) of precipitation spread over 13 days, contributing to an average humidity of 86%, creating a distinctly wet and humid atmosphere.

April Temperature in Washington

In April in Washington, the average temperature is 12°C (55°F). Maximums can reach 30°C (86°F), and minimums can drop as low as -4°C (25°F). Be prepared to experience a wide range of temperatures during 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 12°C (55°F), with highs reaching up to 30°C (86°F) and lows dropping to around -4°C (25°F).
JanFebMarAprMayJunJulAugSepOctNovDec343845546572777570594439
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 143 mm (5.6 in) over a span of 13 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 143 mm (5.6 inches) of precipitation spread over approximately 13 days.
JanFebMarAprMayJunJulAugSepOctNovDec9112511514314715311212310411382117
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 86%. With an average temperature of 12°C (55°F), this humidity feels like a damp chill that clings to your skin, making it essential to dress in layers while 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 86%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%88%88%87%82%84%82%73%74%81%89%86%
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 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 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 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec357910101098653
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 Weather1°C (34°F)91 mm (3.6 inches)88%moderate
February Weather4°C (39°F)125 mm (4.9 inches)88%moderate
March Weather7°C (46°F)115 mm (4.5 inches)88%high
April Weather12°C (55°F)143 mm (5.6 inches)86%very high
May Weather18°C (65°F)147 mm (5.8 inches)82%very high
June Weather22°C (72°F)153 mm (6.0 inches)84%very high
July Weather25°C (77°F)112 mm (4.4 inches)82%very high
August Weather24°C (75°F)123 mm (4.8 inches)73%very high
September Weather21°C (70°F)104 mm (4.1 inches)73%very high
October Weather15°C (60°F)113 mm (4.4 inches)81%high
November Weather7°C (45°F)82 mm (3.2 inches)89%moderate
December Weather4°C (39°F)117 mm (4.6 inches)86%moderate

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