September weather forecast and climate
Silverton, CO

The view of Silverton, Colorado, via the beauty of the brown and yellow trees in the fall
The view of Silverton, Colorado, via the beauty of the brown and yellow trees in the fall

Weather in September

The first month of the autumn, September, is still a mild month in Silverton, Colorado, with average temperature varying between 59.4°F (15.2°C) and 37.2°F (2.9°C).

Temperature

In September, the average high-temperature marginally drops, from a comfortable 65.1°F (18.4°C) in August, to a moderate 59.4°F (15.2°C). The average low-temperature, in September, is 37.2°F (2.9°C).

Humidity

In September, the average relative humidity is 61%.

Rainfall

In September, the rain falls for 12.6 days. Throughout September, 1.69" (43mm) of precipitation is accumulated. In Silverton, during the entire year, the rain falls for 107.5 days and collects up to 26.34" (669mm) of precipitation.

Snowfall

Months with snowfall in Silverton are January through December. In Silverton, Colorado, in September, during 3 snowfall days, 2.2" (56mm) of snow is typically accumulated. Throughout the year, there are 117.7 snowfall days, and 123.82" (3145mm) of snow is accumulated.

Daylight

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

Sunshine

In September, the average sunshine is 10.7h.

UV index

In September, the average daily maximum UV index is 3. A UV Index value of 3 to 5 symbolizes a moderate threat to health from the exposure to the Sun's UV radiation for the ordinary person.
Note: In September, the average maximum UV index of 3 translate into the following recommendations:
Take precautions - Protection against sunburn is recommended. 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.
[Resources]

FAQ

What is the temperature in September in Silverton?

In September, the average high-temperature is 59.4°F (15.2°C), and the average low-temperature is 37.2°F (2.9°C).

What is the average humidity in September in Silverton?

In Silverton, Colorado, the average relative humidity in September is 61%.

How much does it rain in Silverton in September?

In September, in Silverton, the rain falls for 12.6 days. Throughout September, 1.69" (43mm) of precipitation is accumulated.

How much does it snow in Silverton in September?

In Silverton, Colorado, in September, during 3 snowfall days, 2.2" (56mm) of snow is typically accumulated.

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

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

How long on average sun shines in September in Silverton?

In Silverton, Colorado, the average sunshine in September is 10.7h.

How high is the UV index in September in Silverton?

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

Average temperature in September
Silverton, CO

Average temperature in September - Silverton, CO
  • Average high temperature in September: 59.4°F

The warmest month (with the highest average high temperature) is July (66.7°F).
The month with the lowest average high temperature is December (25.7°F).

  • Average low temperature in September: 37.2°F

The month with the highest average low temperature is July (43.3°F).
The coldest month (with the lowest average low temperature) is January (4.3°F).

[Resources]

Average pressure in September
Silverton, CO

Average pressure in September - Silverton, CO
  • Average pressure in September: 30.03"

The month with the highest atmospheric pressure is January (30.23").
Months with the lowest atmospheric pressure are April and May (29.92").

[Resources]

Average wind speed in September
Silverton, CO

Average wind speed in September - Silverton, CO
  • Average wind speed in September: 5.2mph

The windiest month (with the highest average wind speed) is June (7.1mph).
The calmest months (with the lowest average wind speed) are July and August (4.7mph).

[Resources]

Average humidity in September
Silverton, CO

Average humidity in September - Silverton, CO
  • Average humidity in September: 61%

The month with the highest relative humidity is February (86%).
The month with the lowest relative humidity is June (45%).

[Resources]

Average rainfall in September
Silverton, CO

Average rainfall in September - Silverton, CO
  • Average rainfall in September: 1.69"

The wettest month (with the highest rainfall) is July (4.02").
The driest month (with the least rainfall) is June (1.3").

[Resources]

Average rainfall days in September
Silverton, CO

Average rainfall days in September - Silverton, CO
  • Average rainfall days in September: 12.6 days

The month with the highest number of rainy days is July (21.4 days).
The month with the least rainy days is November (3.1 days).

[Resources]

Average snowfall in September
Silverton, CO

Average snowfall in September - Silverton, CO
  • Average snowfall in September: 2.2"

The month with the highest snowfall is March (19.88").
The month with the least snowfall is July (0.12").

[Resources]

Average snowfall days in September
Silverton, CO

Average snowfall days in September - Silverton, CO
  • Average snowfall days in September: 3 days

The month with the highest number of snowfall days is February (17.3 days).
The month with the least snowfall days is July (0.3 days).

[Resources]

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

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

The month with the longest days is June (Average daylight: 14.8h).
The month with the shortest days is December (Average daylight: 9.6h).

  • Average sunshine in September: 10.7h

The month with the most sunshine is June (Average sunshine: 11.8h).
The month with the least sunshine is December (Average sunshine: 5.8h).

[Resources]

Average sunshine days in September
Silverton, CO

Average sunshine days in September - Silverton, CO
  • Average sunshine days in September: 13.9 days

The month with the most sunshine days is November (19.1 days).
The month with the least sunshine days is July (8.1 days).

[Resources]

Average UV index in September
Silverton, CO

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

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

[Resources]

Average cloud cover in September
Silverton, CO

Average cloud cover in September - Silverton, CO
  • Average cloud cover in September: 17

The month with the most cloud cover is February (Cloud cover 42).
The month with the least cloud cover is June (Cloud cover 14).

[Resources]

Average visibility in September
Silverton, CO

Average visibility in September - Silverton, CO
  • Average visibility in September: 6mi

Months with the highest visibility are April, May, June, July, August, September, October and November (6mi).
Months with the lowest visibility are January, February and December (4mi).

[Resources]