April Weather in Fairfax, United States

Last updated: June 24, 2025

In April, the average temperature in Fairfax, United States hovers around 6°C (43°F). Expect a significant range, with temperatures dipping to a brisk -16°C (3°F) at their lowest and soaring up to 30°C (86°F) at their highest. Rain makes an appearance with an average precipitation of 80 mm (3.1 in) spread over 9 days. Be prepared for the humidity too, which averages a lofty 84%, adding to the overall atmosphere of the season.

April Temperature in Fairfax

In April in Fairfax, the average temperature is 6°C (43°F), with maximums that can reach 30°C (86°F) and minimums that can drop as low as -16°C (3°F). Travelers should be prepared for a wide range of temperatures and pack accordingly.

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 6°C (43°F), with highs reaching up to 30°C (86°F) and lows dropping to around -16°C (3°F).

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

April Precipitation in Fairfax

In Fairfax in April, the precipitation amount is 80 mm (3.1 in) spread over 9 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 80 mm (3.1 inches) of precipitation spread over approximately 9 days.

Data source: Precipitation data for April generated using information from the Copernicus Climate Change Service.

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

April Humidity in Fairfax

In Fairfax in April, humidity is 84%. With an average temperature of 6°C (43°F), this humidity feels like a damp chill that penetrates your clothing, making outdoor excursions uncomfortable and prompting travelers to seek refuge indoors or find warm, sheltered spots to enjoy their surroundings.

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 84%, 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 Fairfax

In Fairfax 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 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 8, which falls under the very high exposure category.

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.
	Temperature	Precipitation	Humidity	UV
January Weather	-9°C (16°F)	26 mm (1.0 inches)	87%	moderate
February Weather	-9°C (16°F)	27 mm (1.1 inches)	90%	moderate
March Weather	0°C (33°F)	62 mm (2.5 inches)	85%	moderate
April Weather	6°C (43°F)	80 mm (3.1 inches)	84%	very high
May Weather	15°C (60°F)	124 mm (4.9 inches)	78%	very high
June Weather	22°C (72°F)	106 mm (4.2 inches)	80%	very high
July Weather	23°C (74°F)	123 mm (4.8 inches)	81%	very high
August Weather	21°C (71°F)	124 mm (4.9 inches)	81%	very high
September Weather	18°C (65°F)	118 mm (4.6 inches)	81%	very high
October Weather	9°C (48°F)	97 mm (3.8 inches)	84%	moderate
November Weather	1°C (34°F)	30 mm (1.2 inches)	88%	moderate
December Weather	-4°C (24°F)	40 mm (1.6 inches)	84%	low