August Weather in Fairfax

Last updated: March 2, 2024

The weather in Fairfax, United States, during August is characterized by an average temperature of 24°C (76°F). Highs can soar to 34°C (94°F), while lows may dip to 13°C (55°F). Typically, the humidity level in Fairfax throughout August hovers around 80%.

13°C (55°F)

Minimum temperature

24°C (76°F)

Average temperature

34°C (94°F)

Maximum temperature

80%

Humidity

Precipitation and Sunshine hours

In August, Fairfax averages 120 mm (4.7 inches) of rainfall, typically over the course of 10 rainy days. The month enjoys an average of 13 hours 40 minutes of daylight, with the sun shining for approximately 10 hours 36 minutes each day. Additionally, there is a 64% probability of sunny days during this period.

120 mm (4.7 inches)

Precipitation

10 rainy days

Rainy days

10 hours 36 minutes

Sunshine hours

64%

Chance of sun

UV Index

In August, the UV Index in Fairfax reaches a maximum of 9, indicating a level of VeryHigh exposure. The most intense UV radiation typically occurs between 13:00 and 15:00, during which unprotected skin may burn in as little as 15 minutes.

Average solar exposure data for the current time of the year. Actual values may vary and depend on many factors, such as cloud cover, vegetation cover, surface type, etc.
  07:00 08:00 09:00 10:00 11:00 12:00 13:00 14:00 15:00 16:00 17:00 18:00 19:00
UVI 1 1 2 4 7 8 9 9 8 6 4 2 1
Exposure Low Moderate High VeryHigh High Moderate Low
Time to burn 45 min 30 min 25 min 15 min 25 min 30 min 45 min

Compare Fairfax's Climate with Cities Worldwide