September weather forecast and climate
Frisco, CO

Weather in September

The first month of the autumn, September, is also a moderate month in Frisco, Colorado, with average temperature fluctuating between 59°F (15°C) and 33.8°F (1°C).

Temperature

In September, the average high-temperature marginally drops, from an enjoyable 65.5°F (18.6°C) in August, to a mild 59°F (15°C). The average low-temperature, in Frisco, is 33.8°F (1°C).

Humidity

In September, the average relative humidity in Frisco is 58%.

Rainfall

In September, the rain falls for 9 days. Throughout September, 1.02" (26mm) of precipitation is accumulated. In Frisco, during the entire year, the rain falls for 74.4 days and collects up to 14.96" (380mm) of precipitation.

Snowfall

Months with snowfall in Frisco are January through December. In Frisco, Colorado, in September, snow falls for 3.5 days, with typically accumulated 1.26" (32mm) of snow. Throughout the year, there are 99.6 snowfall days, and 68.54" (1741mm) of snow is accumulated.

Daylight

In September, the average length of the day in Frisco is 12.4h.

Sunshine

In Frisco, the average sunshine is 10.9h.

UV index

The average daily maximum UV index in Frisco is 3. A UV Index value of 3 to 5 symbolizes a moderate health risk from unprotected exposure to the Sun's UV rays for the ordinary person.
Note: The daily maximum UV index of 3 in September interpret into the following advice:
Take precautions - Protection against sun damage is advised. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
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FAQ

What is the average humidity in September in Frisco?

In September, the average relative humidity is 58%.

How many days does it rain in September in Frisco?

In Frisco, in September, it is raining for 9 days, with typically 1.02" (26mm) of accumulated precipitation.

How many days does it snow in September in Frisco?

In Frisco, Colorado, in September, snow falls for 3.5 days, with typically accumulated 1.26" (32mm) of snow.

What is the average length of the day in September in Frisco?

In September, the average length of the day is 12.4h.

How long on average sun shines in September in Frisco?

The average sunshine in September in Frisco, Colorado, is 10.9h.

How high is the UV index in September in Frisco?

The average daily maximum UV index in September in Frisco is 3. A UV Index of 3 to 5 symbolizes a moderate vulnerability from the exposure to the Sun's UV radiation.

Average temperature in September
Frisco, CO

Average temperature in September - Frisco, CO
  • Average high temperature in September: 15°C

The warmest month (with the highest average high temperature) is July (19.5°C).
The month with the lowest average high temperature is December (-5.2°C).

  • Average low temperature in September: 1°C

The month with the highest average low temperature is July (4.8°C).
The coldest month (with the lowest average low temperature) is January (-16.9°C).

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Average pressure in September
Frisco, CO

Average pressure in September - Frisco, CO
  • Average pressure in September: 1017.5mbar

The month with the highest atmospheric pressure is January (1022.6mbar).
The month with the lowest atmospheric pressure is April (1013.8mbar).

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Average wind speed in September
Frisco, CO

Average wind speed in September - Frisco, CO
  • Average wind speed in September: 8.3km/h

The windiest month (with the highest average wind speed) is February (10.7km/h).
The calmest month (with the lowest average wind speed) is August (7.7km/h).

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Average humidity in September
Frisco, CO

Average humidity in September - Frisco, CO
  • Average humidity in September: 58%

The month with the highest relative humidity is February (88%).
The month with the lowest relative humidity is June (53%).

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Average rainfall in September
Frisco, CO

Average rainfall in September - Frisco, CO
  • Average rainfall in September: 26mm

The wettest month (with the highest rainfall) is July (60mm).
The driest month (with the least rainfall) is January (17mm).

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Average rainfall days in September
Frisco, CO

Average rainfall days in September - Frisco, CO
  • Average rainfall days in September: 9 days

The month with the highest number of rainy days is July (19.3 days).
Months with the least rainy days are February and November (1.1 days).

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Average snowfall in September
Frisco, CO

Average snowfall in September - Frisco, CO
  • Average snowfall in September: 32mm

The month with the highest snowfall is May (315mm).
The month with the least snowfall is July (3mm).

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Average snowfall days in September
Frisco, CO

Average snowfall days in September - Frisco, CO
  • Average snowfall days in September: 3.5 days

The month with the highest number of snowfall days is May (13.8 days).
The month with the least snowfall days is July (0.9 days).

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Average daylight in September /
Average sunshine in September
Frisco, CO

Average daylight in September / Average sunshine in September - Frisco, 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: 10.9h

The month with the most sunshine is June (Average sunshine: 11.5h).
The month with the least sunshine is February (Average sunshine: 5.4h).

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Average sunshine days in September
Frisco, CO

Average sunshine days in September - Frisco, CO
  • Average sunshine days in September: 17.2 days

The month with the most sunshine days is October (22.3 days).
The month with the least sunshine days is July (8.7 days).

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Average UV index in September
Frisco, CO

Average UV index in September - Frisco, CO
  • Average UV index in September: 3

Months with the highest UV index are July and August (UV index 4).
The month with the lowest UV index is December (UV index 1).

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Average cloud cover in September
Frisco, CO

Average cloud cover in September - Frisco, CO
  • Average cloud cover in September: 19

The month with the most cloud cover is February (Cloud cover 51).
The month with the least cloud cover is June (Cloud cover 18).

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Average visibility in September
Frisco, CO

Average visibility in September - Frisco, CO
  • Average visibility in September: 9km

The month with the highest visibility is June (10km).
Months with the lowest visibility are January and February (6km).

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