Frisco
Colorado, USA
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Frisco, CO

September, the first month of the autumn, in Frisco, is still a mild month, with average temperature ranging between max 59°F (15°C) and min 33.8°F (1°C).

Temperature

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

Humidity

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

Rainfall

In September, in Frisco, Colorado, the rain falls for 9 days. Throughout September, 1.02" (26mm) of precipitation is accumulated. Throughout the year, in Frisco, Colorado, there are 74.4 rainfall days, and 14.96" (380mm) of precipitation is accumulated.

Snowfall

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

Daylight

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

Sunshine

The average sunshine is 10.9h.

UV index

The average daily maximum UV index in Frisco is 3. A UV Index reading of 3 to 5 represents a medium health hazard from unsafe exposure to the UV radiation for the ordinary person.
Note: The average daily UV index of 3 transform into the following instructions:
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. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.

What is the temperature in September in Frisco?

In September, in Frisco, the average high-temperature is 59°F (15°C), and the average low-temperature is 33.8°F (1°C).

What is the average humidity in September in Frisco?

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

How much does it rain in Frisco in September?

In Frisco, Colorado, during September, the rain falls for 9 days and regularly aggregates up to 1.02" (26mm) of precipitation.

How much does it snow in Frisco in September?

In Frisco, 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?

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

How long on average sun shines in September in Frisco?

In September, the average sunshine in Frisco is 10.9h.

How high is the UV index in September in Frisco?

In Frisco, the average daily maximum UV index in September is 3. A UV Index value of 3 to 5 symbolizes a medium hazard to health from the exposure to the Sun's UV rays.
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).

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%).

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).

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).

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).

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).

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).

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).