September weather forecast and climate
Silt, CO

Weather in September

The first month of the autumn, September, is still a pleasant month in Silt, Colorado, with temperature in the range of an average high of 70.9°F (21.6°C) and an average low of 43.9°F (6.6°C).

Temperature

In Silt, the average high-temperature slightly decreases, from a moderately hot 78.4°F (25.8°C) in August, to an agreeable 70.9°F (21.6°C). In September, the average low-temperature is 43.9°F (6.6°C).

Humidity

The average relative humidity in Silt is 48%.

Rainfall

September is the month with the least rainfall. Rain falls for 7.9 days and accumulates 0.51" (13mm) of precipitation.

Snowfall

In Silt snow does not fall in June through September.

Daylight

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

Sunshine

In September, the average sunshine in Silt is 11h.

UV index

In September, the average daily maximum UV index in Silt is 4. A UV Index of 3 to 5 symbolizes a moderate threat to health from the exposure to the Sun's UV rays for the ordinary person.
Note: In September, the average maximum UV index of 4 translate into the following recommendations:
Take precautions. Light skin individuals may get burned in less than 30 minutes. 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.
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FAQ

What is the average humidity in September in Silt?

The average relative humidity in September is 48%.

What is the driest month in Silt?

September is the month with the least rainfall in Silt, Colorado. Rain falls for 7.9 days and accumulates 0.51" (13mm) of precipitation.

How many days does it rain in September in Silt?

In September, in Silt, Colorado, the rain falls for 7.9 days. Throughout September, 0.51" (13mm) of precipitation is accumulated.

When it does not snow in Silt?

June through September are months without snowfall in Silt.

Does it snow in Silt in September?

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

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

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

How long on average sun shines in September in Silt?

In Silt, Colorado, the average sunshine in September is 11h.

What is the UV index intensity in September in Silt?

The average daily maximum UV index in September in Silt is 4. A UV Index estimate of 3 to 5 represents a medium health risk from the exposure to the Sun's UV rays.

Average temperature in September
Silt, CO

Average temperature in September - Silt, CO
  • Average high temperature in September: 70.9°F

The warmest month (with the highest average high temperature) is July (80.2°F).
The month with the lowest average high temperature is January (30.6°F).

  • Average low temperature in September: 43.9°F

The month with the highest average low temperature is July (50.4°F).
The coldest month (with the lowest average low temperature) is January (12°F).

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Average pressure in September
Silt, CO

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

The month with the highest atmospheric pressure is January (30.27").
The month with the lowest atmospheric pressure is May (29.93").

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Average wind speed in September
Silt, CO

Average wind speed in September - Silt, CO
  • Average wind speed in September: 5.3mph

The windiest month (with the highest average wind speed) is June (6.2mph).
The calmest month (with the lowest average wind speed) is January (4.1mph).

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Average humidity in September
Silt, CO

Average humidity in September - Silt, CO
  • Average humidity in September: 48%

The month with the highest relative humidity is January (85%).
The month with the lowest relative humidity is June (43%).

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Average rainfall in September
Silt, CO

Average rainfall in September - Silt, CO
  • Average rainfall in September: 0.51"

The wettest month (with the highest rainfall) is April (1.57").
The driest month (with the least rainfall) is September (0.51").

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Average rainfall days in September
Silt, CO

Average rainfall days in September - Silt, CO
  • Average rainfall days in September: 7.9 days

The month with the highest number of rainy days is April (14 days).
The month with the least rainy days is June (5.9 days).

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Average snowfall in September
Silt, CO

Average snowfall in September - Silt, CO
  • Average snowfall in September: 0"

The month with the highest snowfall is February (8.74").
Months with the least snowfall are June, July, August and September (0").

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Average snowfall days in September
Silt, CO

Average snowfall days in September - Silt, CO
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (13 days).
Months with the least snowfall days are June, July, August and September (0 days).

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

Average daylight in September / Average sunshine in September - Silt, 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: 11h

Months with the most sunshine are June, July and August (Average sunshine: 11.9h).
The month with the least sunshine is January (Average sunshine: 6.1h).

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Average sunshine days in September
Silt, CO

Average sunshine days in September - Silt, CO
  • Average sunshine days in September: 17.7 days

The month with the most sunshine days is June (20.7 days).
The month with the least sunshine days is April (11.7 days).

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Average UV index in September
Silt, CO

Average UV index in September - Silt, CO
  • Average UV index in September: 4

Months with the highest UV index are June, July and August (UV index 5).
Months with the lowest UV index are January, February, March, October, November and December (UV index 2).

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Average cloud cover in September
Silt, CO

Average cloud cover in September - Silt, CO
  • Average cloud cover in September: 12

The month with the most cloud cover is February (Cloud cover 39).
Months with the least cloud cover are June and September (Cloud cover 12).

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Average visibility in September
Silt, CO

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

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

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