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April Weather in Washington, United States

Last updated: August 27, 2025

In Washington, United States, the average temperature in April hovers around 12°C (53°F). However, temperatures can swing widely, with minimums dipping to -9°C (15°F) and maximums soaring to 34°C (93°F). Expect about 60 mm (2.4 in) of precipitation spread over 7 days, alongside an average humidity level of 73%.

April Temperature in Washington

In April in Washington, the average temperature is 12°C (53°F). Maximum temperatures can reach 34°C (93°F), while minimum temperatures can drop to as low as -9°C (15°F). Be prepared for a wide temperature range when traveling to Washington during this month.

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 (53°F), with highs reaching up to 34°C (93°F) and lows dropping to around -9°C (15°F).
JanFebMarAprMayJunJulAugSepOctNovDec303044536477807772554335
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 60 mm (2.4 in) over the course of 7 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 60 mm (2.4 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec28278761201948995671213128
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 73%. With an average temperature of 12°C (53°F), this humidity feels like a damp chill that seeps into your bones, making outdoor activities somewhat uncomfortable and requiring layers to keep warm while exploring.

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 73%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec76%78%70%73%82%82%81%78%71%71%81%84%
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.
JanFebMarAprMayJunJulAugSepOctNovDec3569101111109643
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-1°C (30°F)28 mm (1.1 inches)76%moderate
February Weather-1°C (30°F)27 mm (1.1 inches)77%moderate
March Weather7°C (45°F)86 mm (3.4 inches)70%high
April Weather12°C (53°F)60 mm (2.4 inches)73%very high
May Weather18°C (65°F)201 mm (7.9 inches)82%very high
June Weather25°C (78°F)94 mm (3.7 inches)82%extreme
July Weather27°C (81°F)89 mm (3.5 inches)81%extreme
August Weather25°C (77°F)95 mm (3.7 inches)78%very high
September Weather22°C (72°F)67 mm (2.7 inches)71%very high
October Weather13°C (55°F)121 mm (4.8 inches)71%high
November Weather6°C (43°F)31 mm (1.2 inches)81%moderate
December Weather2°C (35°F)28 mm (1.1 inches)84%moderate

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