September Weather in Castle Rock

Last updated: March 2, 2024

The weather in Castle Rock, United States, during September is characterized by an average temperature of 16°C (61°F). Highs can soar to 31°C (88°F), while lows may dip to 6°C (43°F). Typically, the humidity level in Castle Rock throughout September hovers around 74%.

6°C (43°F)

Minimum temperature

16°C (61°F)

Average temperature

31°C (88°F)

Maximum temperature

74%

Humidity

Precipitation and Sunshine hours

In September, Castle Rock averages 84 mm (3.3 inches) of rainfall, typically over the course of 9 rainy days. The month enjoys an average of 12 hours 28 minutes of daylight, with the sun shining for approximately 8 hours 14 minutes each day. Additionally, there is a 39% probability of sunny days during this period.

84 mm (3.3 inches)

Precipitation

9 rainy days

Rainy days

8 hours 14 minutes

Sunshine hours

39%

Chance of sun

UV Index

In September, the UV Index in Castle Rock reaches a maximum of 7, indicating a level of High exposure. The most intense UV radiation typically occurs between 12:00 and 14:00, during which unprotected skin may burn in as little as 25 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 3 5 7 7 7 6 4 2 1 1
Exposure Low Moderate High Moderate Low
Time to burn 45 min 30 min 25 min 30 min 45 min

Compare Castle Rock's Climate with Cities Worldwide