September weather forecast and climate
Highlands Ranch, CO

Weather in September

September, the first month of the autumn, in Highlands Ranch, is also a moderately hot month, with temperature in the range of an average low of 52.2°F (11.2°C) and an average high of 77.7°F (25.4°C).

Temperature

In September, the average high-temperature slightly decreases, from 84.4°F (29.1°C) in August, to a still moderately hot 77.7°F (25.4°C). In Highlands Ranch, Colorado,, the average low-temperature is 52.2°F (11.2°C).

Humidity

The average relative humidity in Highlands Ranch is 43%.

Rainfall

In September, in Highlands Ranch, the rain falls for 6 days. Throughout September, 0.43" (11mm) of precipitation is accumulated. In Highlands Ranch, during the entire year, the rain falls for 77.1 days and collects up to 10.16" (258mm) of precipitation.

Snowfall

In Highlands Ranch snow does not fall in June through September.

Daylight

In Highlands Ranch, the average length of the day is 12.4h.

Sunshine

In Highlands Ranch, the average sunshine is 11.1h.

UV index

In September, the average daily maximum UV index in Highlands Ranch is 5. A UV Index estimate of 3 to 5 represents a medium vulnerability from the exposure to the Sun's UV radiation for the average person.
Note: In September, the average maximum UV index of 5 translate into the following recommendations:
Take precautions - Protection against the skin and eye damage is obliged. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the average humidity in September in Highlands Ranch?

The average relative humidity in September in Highlands Ranch is 43%.

How many days does it rain in September in Highlands Ranch?

In Highlands Ranch, Colorado, during September, the rain falls for 6 days and regularly aggregates up to 0.43" (11mm) of precipitation.

When it does not snow in Highlands Ranch?

June through September are months without snowfall.

Does it snow in Highlands Ranch in September?

In Highlands Ranch, Colorado, in September, it doesn't snow. In October, it regularly snows.

What is the average length of the day in September in Highlands Ranch?

The average length of the day in September in Highlands Ranch, Colorado, is 12.4h.

How many hours of sunshine does Highlands Ranch have in September?

In September, the average sunshine is 11.1h.

How high is the UV index in September in Highlands Ranch?

The average daily maximum UV index in September is 5. A UV Index value of 3 to 5 symbolizes a medium health risk from the exposure to the Sun's UV rays.

Average temperature in September
Highlands Ranch, CO

Average temperature in September - Highlands Ranch, CO
  • Average high temperature in September: 77.7°F

The warmest month (with the highest average high temperature) is July (85.6°F).
The month with the lowest average high temperature is December (41.2°F).

  • Average low temperature in September: 52.2°F

The month with the highest average low temperature is July (58.6°F).
The coldest month (with the lowest average low temperature) is December (20.7°F).

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Average pressure in September
Highlands Ranch, CO

Average pressure in September - Highlands Ranch, CO
  • Average pressure in September: 30.01"

The month with the highest atmospheric pressure is January (30.14").
Months with the lowest atmospheric pressure are April and June (29.91").

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Average wind speed in September
Highlands Ranch, CO

Average wind speed in September - Highlands Ranch, CO
  • Average wind speed in September: 6.4mph

The windiest month (with the highest average wind speed) is April (7.3mph).
The calmest months (with the lowest average wind speed) are August and September (6.4mph).

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Average humidity in September
Highlands Ranch, CO

Average humidity in September - Highlands Ranch, CO
  • Average humidity in September: 43%

The month with the highest relative humidity is February (65%).
Months with the lowest relative humidity are June and August (42%).

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Average rainfall in September
Highlands Ranch, CO

Average rainfall in September - Highlands Ranch, CO
  • Average rainfall in September: 0.43"

The wettest month (with the highest rainfall) is May (1.61").
The driest month (with the least rainfall) is January (0.39").

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Average rainfall days in September
Highlands Ranch, CO

Average rainfall days in September - Highlands Ranch, CO
  • Average rainfall days in September: 6 days

The month with the highest number of rainy days is July (11.8 days).
The month with the least rainy days is January (1.5 days).

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Average snowfall in September
Highlands Ranch, CO

Average snowfall in September - Highlands Ranch, CO
  • Average snowfall in September: 0"

The month with the highest snowfall is February (5.75").
Months with the least snowfall are June, July, August and September (0").

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Average snowfall days in September
Highlands Ranch, CO

Average snowfall days in September - Highlands Ranch, CO
  • Average snowfall days in September: 0.1 days

The month with the highest number of snowfall days is February (8.3 days).
Months with the least snowfall days are June, July and August (0 days).

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Average daylight in September /
Average sunshine in September
Highlands Ranch, CO

Average daylight in September / Average sunshine in September - Highlands Ranch, CO
  • Average daylight in September: 12.4h

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

  • Average sunshine in September: 11.1h

The month with the most sunshine is June (Average sunshine: 11.9h).
The month with the least sunshine is February (Average sunshine: 6.8h).

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Average sunshine days in September
Highlands Ranch, CO

Average sunshine days in September - Highlands Ranch, CO
  • Average sunshine days in September: 22 days

The month with the most sunshine days is October (24.5 days).
The month with the least sunshine days is July (16.3 days).

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Average UV index in September
Highlands Ranch, CO

Average UV index in September - Highlands Ranch, CO
  • Average UV index in September: 5

Months with the highest UV index are June, July and August (UV index 6).
Months with the lowest UV index are January, February, November and December (UV index 2).

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Average cloud cover in September
Highlands Ranch, CO

Average cloud cover in September - Highlands Ranch, CO
  • Average cloud cover in September: 14

Months with the most cloud cover are April and May (Cloud cover 25).
The month with the least cloud cover is September (Cloud cover 14).

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Average visibility in September
Highlands Ranch, CO

Average visibility in September - Highlands Ranch, CO
  • Average visibility in September: 6mi

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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