September weather forecast and climate
Castle Rock, CO

What is the average temperature in September in Castle Rock?

In Castle Rock, in September, the average high-temperature is 75.6°F (24.2°C), and the average low-temperature is 45.9°F (7.7°C).
Average temperature in September - Castle Rock, CO
  • Average high temperature in September: 75.6°F

The warmest month (with the highest average high temperature) is July (85.2°F).
The month with the lowest average high temperature is December (44.7°F).

  • Average low temperature in September: 45.8°F

The month with the highest average low temperature is July (55.7°F).
The coldest month (with the lowest average low temperature) is December (17.6°F).

Average rainfall in September - Castle Rock, CO
  • Average rainfall in September: 1.2"

The wettest month (with the highest rainfall) is August (2.7").
The driest month (with the lowest rainfall) is January (0.6").

Average rainfall days in September - Castle Rock, CO
  • Average rainfall days in September: 5.8 days

The month with the highest number of rainy days is August (9.4 days).
The month with the lowest number of rainy days is January (3.5 days).

Average snowfall in September - Castle Rock, CO
  • Average snowfall in September: 0.3"

The month with the highest snowfall is March (14.7").
Months with the lowest snowfall are June, July and August (0").

Average snowfall days in September - Castle Rock, CO
  • Average snowfall days in September: 0.3 days

The month with the highest number of snowfall days is March (3.9 days).
Months with the lowest number of snowfall days are June, July and August (0 days).

Average daylight in September - Castle Rock, CO
  • Average daylight in September: 12.4h

The month with the longest days is June (Average daylight: 14.9h).
The month with shortest days is December (Average daylight: 9.4h).

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