Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
As September arrives, Silverthorne's weather displays a minor decrease in high-temperatures, transitioning from August's enjoyable 65.8°F (18.8°C) to a moderate 59.7°F (15.4°C). In September, the temperature registers a significant dip to an average of 33.6°F (0.9°C) at night.Humidity
The average relative humidity in September in Silverthorne, Colorado, is 58%.Rainfall
September is the month with the least rainfall. Rain falls for 9.8 days and accumulates 0.91" (23mm) of precipitation.Snowfall
January through December are months with snowfall in Silverthorne. In Silverthorne, Colorado, during September, snow falls for 3.5 days and regularly aggregates up to 0.94" (24mm) of snow. In Silverthorne, during the entire year, snow falls for 139.9 days and aggregates up to 89.53" (2274mm) of snow.Daylight
The average length of the day in September is 12h and 26min.On the first day of the month, sunrise is at 6:33 am and sunset at 7:34 pm. On the last day of September, sunrise is at 7:00 am and sunset at 6:47 pm MDT.
Sunshine
In September, the average sunshine is 10.9h.UV index
In Silverthorne, the average daily maximum UV index in September is 3. A UV Index reading of 3 to 5 represents a moderate health risk from exposure to the Sun's UV rays for the average person.Note: The daily high UV index of 3 in September translates into this advice:
Be mindful. Individuals with a lighter skin tone may suffer burns in less than 30 minutes. Avoiding the Sun's peak radiation during midday hours is essential for health and safety. Loose clothes with a tight weave are optimal for safeguarding yourself against the Sun's rays. Be aware! The intensity of the Sun's UV radiation can be amplified nearly twice due to snow reflection.
Frequently asked questions
What are the temperatures in Silverthorne in September?
What is the average humidity in September in Silverthorne?
What is the driest month in Silverthorne?
How much does it rain in Silverthorne in September?
How much does it snow in Silverthorne in September?
How many hours of daylight does Silverthorne have in September?
What time are sunrise and sunset in September in Silverthorne?
How many hours of sunshine does Silverthorne have in September?
What is the UV index reading in September in Silverthorne?
Average temperature in September
Silverthorne, CO
- Average high temperature in September: 59.7°F
The warmest month (with the highest average high temperature) is July (67.6°F).
The month with the lowest average high temperature is December (22.8°F).
- Average low temperature in September: 33.6°F
The month with the highest average low temperature is July (39.7°F).
The coldest month (with the lowest average low temperature) is January (1.2°F).
Average pressure in September
Silverthorne, CO
- Average pressure in September: 30.05"Hg
The month with the highest atmospheric pressure is January (30.2"Hg).
The months with the lowest atmospheric pressure are April and May (29.94"Hg).
Average wind speed in September
Silverthorne, CO
- Average wind speed in September: 5.2mph
The windiest month (with the highest average wind speed) is February (6.6mph).
The calmest month (with the lowest average wind speed) is August (4.8mph).
Average humidity in September
Silverthorne, 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
Silverthorne, CO
- Average rainfall in September: 0.91"
The wettest month (with the highest rainfall) is May (2.05").
The driest month (with the least rainfall) is September (0.91").
Average rainfall days in September
Silverthorne, CO
- Average rainfall days in September: 9.8 days
The month with the highest number of rainy days is July (17.6 days).
The month with the least rainy days is November (3.6 days).
Average snowfall in September
Silverthorne, CO
- Average snowfall in September: 0.94"
The month with the highest snowfall is March (14.61").
The month with the least snowfall is August (0.24").
Average snowfall days in September
Silverthorne, CO
- Average snowfall days in September: 3.5 days
The month with the highest number of snowfall days is March (20.3 days).
The month with the least snowfall days is July (0.6 days).
Average daylight in September /
Average sunshine in September
Silverthorne, CO
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in September: 10h and 5min
The month with the most sunshine is June (Average sunshine: 11h and 36min).
The month with the least sunshine is February (Average sunshine: 5h and 30min).
Average sunshine days in September
Silverthorne, CO
- Average sunshine days in September: 15 days
The month with the most sunshine days is November (17.5 days).
The month with the least sunshine days is April (7.4 days).
Average UV index in September
Silverthorne, CO
- Average UV index in September: 3
The months with the highest UV index are July and August (UV index 4).
The months with the lowest UV index are February and December (UV index 1).
Average cloud cover in September
Silverthorne, 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 17).
Average visibility in September
Silverthorne, CO
- Average visibility in September: 6mi
The months with the highest visibility are June, July, August, September and October (6mi).
The months with the lowest visibility are January, February, March, April and December (4mi).
Silverthorne, Colorado, USA
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