September weather forecastSilverton, CO
September
Weather in September
The pleasant September weather in Silverton sees the temperatures cooling slightly after the hot summer days. The city sees an increase in snowfall to 2.2" (56mm) on average, which marks the advent of the color-changing, leaf-falling autumn season. As September transitions into October, the cooling trend continues, with the city preparing to embrace the forthcoming winter. The less crowded streets, the mild weather, and the colorful fall foliage make September a favorite among those who enjoy serene retreats.Temperature
With the arrival of September, Silverton experiences a modest decline in average high-temperatures, transitioning from a refreshing 65.1°F (18.4°C) in August to a moderate 59.4°F (15.2°C). Silverton experiences a drastic reduction from day temperatures to an average low of 37.2°F (2.9°C) in September.Humidity
In September, the average relative humidity in Silverton is 61%.Rainfall
In Silverton, in September, during 12.6 rainfall days, 1.69" (43mm) of precipitation is typically 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 are January through December. In September, it is snowing for 3 days. Throughout September, 2.2" (56mm) of snow is accumulated. Throughout the year, there are 117.7 snowfall days, and 123.82" (3145mm) of snow is accumulated.Daylight
In Silverton, the average length of the day in September is 12h and 25min.On the first day of the month, sunrise is at 6:41 am and sunset at 7:39 pm. On the last day of September, sunrise is at 7:06 am and sunset at 6:54 pm MDT.
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 medium vulnerability from exposure to the Sun's UV radiation for average individuals.Note: A maximum UV index of 3 in September translates into the following recommendations:
Heed the precautions - Suggestions to avoid sunburn are made. To protect against the Sun's most potent rays, avoid direct exposure around midday. To mitigate harm from sun exposure, pick sunglasses offering UVA and UVB defense. Foresee this! The reflection from snow can nearly double the intensity of UV radiation from the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
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).
Average pressure in September
Silverton, CO
- Average pressure in September: 30.03"Hg
The month with the highest atmospheric pressure is January (30.23"Hg).
The months with the lowest atmospheric pressure are April and May (29.92"Hg).
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).
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%).
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").
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).
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").
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).
Average daylight in September /
Average sunshine in September
Silverton, CO
- Average daylight in September: 12h and 24min
The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in September: 10h and 42min
The month with the most sunshine is June (Average sunshine: 11h and 48min).
The month with the least sunshine is December (Average sunshine: 5h and 48min).
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).
Average UV index in September
Silverton, CO
- Average UV index in September: 3
The 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).
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).
Average visibility in September
Silverton, CO
- Average visibility in September: 6mi
The months with the highest visibility are April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January, February and December (4mi).
