October Weather in Fairfax, United States

Last updated: June 24, 2025

In October, the average temperature in Fairfax, United States is a pleasant 21°C (71°F). During this time, temperatures can fluctuate from a chilly 2°C (36°F) to a sweltering 38°C (100°F). Expect about 72 mm (2.8 in) of rainfall spread over 8 days, contributing to an average humidity of 78%. Plan your activities accordingly to enjoy the best of what the season has to offer!

October Temperature in Fairfax

In October in Fairfax, the average temperature is 21°C (71°F), with maximums reaching up to 38°C (100°F) and minimums dropping as low as 2°C (36°F). Be prepared for a wide range of temperatures during your travels.

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

The chart illustrates October 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, October typically has an average temperature of 21°C (71°F), with highs reaching up to 38°C (100°F) and lows dropping to around 2°C (36°F).

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

October Precipitation in Fairfax

In Fairfax in October, the precipitation amount is 72 mm (2.8 in) over the course of 8 days.

October Precipitation Trends in Fairfax

The chart displays monthly precipitation patterns in Fairfax, with values for each month alongside October’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how October’s conditions compare to those of other months. In Fairfax, October typically receives around 72 mm (2.8 inches) of precipitation spread over approximately 8 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

October Humidity in Fairfax

In Fairfax in October humidity is 78%. With an average temperature of 21°C (71°F), this humidity feels like a warm blanket wrapped around you, making travel a bit more challenging as it can lead to a sticky, heavy sensation, dampening the enjoyment of outdoor activities.

October Average Humidity in Fairfax

This chart illustrates the average monthly humidity levels in Fairfax, with October’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In October, average humidity in Fairfax is approximately 78%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for October generated using information from the Copernicus Climate Change Service.

October UV Index in Fairfax

In Fairfax in October, 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 October

The chart shows the monthly maximum UV Index (UVI) for Fairfax in October, 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 October, the maximum UV index in Fairfax typically reaches 8, which falls under the very high exposure category.

Data source: Fairfax October 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 October 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 October’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 October’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	10°C (50°F)	81 mm (3.2 inches)	86%	moderate
February Weather	13°C (56°F)	104 mm (4.1 inches)	81%	high
March Weather	16°C (60°F)	73 mm (2.9 inches)	81%	very high
April Weather	19°C (66°F)	119 mm (4.7 inches)	79%	very high
May Weather	24°C (75°F)	94 mm (3.7 inches)	75%	extreme
June Weather	26°C (79°F)	121 mm (4.8 inches)	75%	extreme
July Weather	28°C (82°F)	143 mm (5.6 inches)	80%	extreme
August Weather	27°C (81°F)	142 mm (5.6 inches)	81%	extreme
September Weather	26°C (78°F)	85 mm (3.3 inches)	83%	very high
October Weather	21°C (71°F)	72 mm (2.8 inches)	78%	very high
November Weather	14°C (57°F)	63 mm (2.5 inches)	85%	high
December Weather	11°C (53°F)	126 mm (5.0 inches)	87%	moderate