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October Weather in Fairfax, United States

Last updated: June 24, 2025

In October, the average temperature in Fairfax, United States hovers around 16°C (61°F). However, be prepared for a range as temperatures can dip as low as -3°C (28°F) and soar up to 34°C (93°F). Expect 121 mm (4.8 in) of precipitation over approximately 9 days, with an average humidity level of 72%.

October Temperature in Fairfax

In October in Fairfax, the average temperature is 16°C (61°F). The maximum can reach 34°C (93°F), while the minimum can drop as low as -3°C (28°F). Be prepared for a wide range of temperatures if you're planning to travel during this time.

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 16°C (61°F), with highs reaching up to 34°C (93°F) and lows dropping to around -3°C (28°F).
JanFebMarAprMayJunJulAugSepOctNovDec373952586979828075614942
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.

October Precipitation in Fairfax

In Fairfax in October, the precipitation amount is 121 mm (4.8 in) over the course of 9 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 121 mm (4.8 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec57449710416010281103881213435
Data source: Precipitation data for October generated using information from the Copernicus Climate Change Service.
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October Humidity in Fairfax

In Fairfax in October humidity is 72%. With an average temperature of 16°C (61°F), this humidity feels like a damp blanket wrapping around you, making every step feel heavier and requiring extra effort while traveling.

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 72%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec77%76%71%74%83%83%81%73%67%72%82%85%
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 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check 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 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec36710101111109753
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.
 TemperaturePrecipitationHumidityUV
January Weather3°C (38°F)57 mm (2.3 inches)77%moderate
February Weather4°C (39°F)43 mm (1.7 inches)76%high
March Weather11°C (52°F)97 mm (3.8 inches)71%high
April Weather15°C (59°F)104 mm (4.1 inches)73%very high
May Weather20°C (69°F)160 mm (6.3 inches)83%very high
June Weather26°C (79°F)101 mm (4.0 inches)83%extreme
July Weather28°C (82°F)80 mm (3.2 inches)81%extreme
August Weather27°C (80°F)103 mm (4.1 inches)73%very high
September Weather24°C (76°F)88 mm (3.4 inches)67%very high
October Weather16°C (61°F)121 mm (4.8 inches)72%high
November Weather9°C (49°F)34 mm (1.3 inches)82%moderate
December Weather6°C (43°F)35 mm (1.4 inches)85%moderate

Compare Fairfax's Climate with Cities Worldwide