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April Weather in Fairfax, United States

Last updated: June 24, 2025

The average temperature in Fairfax, United States during April is 11°C (53°F). Expect extremes, with a minimum of -9°C (16°F) and a maximum of 32°C (90°F). Rain is not uncommon, with an average precipitation amount of 84 mm (3.3 in) over 10 days. The air is relatively humid, with an average humidity of 74%.

April Temperature in Fairfax

In April in Fairfax, the average temperature is 11°C (53°F), with maximums reaching 32°C (90°F) and minimums dipping as low as -9°C (16°F). Travelers should be prepared for a wide range of temperatures and pack accordingly for both warm days and chilly nights.

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

The chart illustrates April temperature patterns in Fairfax, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Fairfax, April typically has an average temperature of 11°C (53°F), with highs reaching up to 32°C (90°F) and lows dropping to around -9°C (16°F).
JanFebMarAprMayJunJulAugSepOctNovDec282944526577797571554234
Data source: Temperature data for Fairfax 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 Fairfax

In Fairfax in April, the precipitation amount is 84 mm (3.3 in) over a span of 10 days.

April Precipitation Trends in Fairfax

The chart displays monthly precipitation patterns in Fairfax, 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 Fairfax, April typically receives around 84 mm (3.3 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec36329284157119112120851293732
Data source: Precipitation data for April generated using information from the Copernicus Climate Change Service.
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April Humidity in Fairfax

In Fairfax in April humidity is 74%. With an average temperature of 11°C (53°F), this humidity feels like a damp chill that seeps into your bones, making outdoor adventures less inviting and suggesting that travelers should dress in layers to stay warm and comfortable.

April Average Humidity in Fairfax

This chart illustrates the average monthly humidity levels in Fairfax, 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 Fairfax is approximately 74%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec76%80%73%75%78%82%83%81%75%75%82%83%
Data source: Humidity data for April generated using information from the Copernicus Climate Change Service.

April UV Index in Fairfax

In Fairfax 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 Fairfax.

Maximum UV Index Levels in Fairfax for April

The chart shows the monthly maximum UV Index (UVI) for Fairfax 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 Fairfax typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356910111098643
Data source: Fairfax 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 Fairfax Compares to Other Months

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

This table compares monthly weather conditions in Fairfax, showing how April’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-2°C (28°F)36 mm (1.4 inches)76%moderate
February Weather-2°C (29°F)32 mm (1.2 inches)80%moderate
March Weather7°C (44°F)92 mm (3.6 inches)73%high
April Weather11°C (53°F)84 mm (3.3 inches)74%very high
May Weather18°C (65°F)157 mm (6.2 inches)78%very high
June Weather25°C (77°F)119 mm (4.7 inches)82%extreme
July Weather26°C (79°F)112 mm (4.4 inches)83%very high
August Weather24°C (76°F)120 mm (4.7 inches)80%very high
September Weather22°C (71°F)85 mm (3.3 inches)75%very high
October Weather13°C (55°F)129 mm (5.1 inches)75%high
November Weather6°C (42°F)37 mm (1.5 inches)82%moderate
December Weather1°C (35°F)32 mm (1.3 inches)83%moderate

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