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
A moderate decline in average high-temperatures is noted in September, moving from an agreeable 72.5°F (22.5°C) in August to an enjoyable 66.2°F (19°C). Nightly readings in September display a noticeable downturn from daily highs, with the average low-temperature registering an icy 37.9°F (3.3°C).Humidity
In Sillsville, the average relative humidity in September is 53%.Rainfall
September is the month with the least rainfall. Rain falls for 5.7 days and accumulates 0.35" (9mm) of precipitation.Snowfall
In Sillsville, Colorado, snow does not fall in July through September.Daylight
In Sillsville, the average length of the day in September is 12h and 25min.On the first day of the month, sunrise is at 6:37 am and sunset at 7:36 pm. On the last day of September, sunrise is at 7:02 am and sunset at 6:50 pm MDT.
Sunshine
In Sillsville, the average sunshine in September is 11.2h.UV index
In September, the average daily maximum UV index is 3. A UV Index estimate of 3 to 5 represents a medium vulnerability from unprotected exposure to Sun's UV rays for ordinary individuals.Note: A maximum daily UV index of 3 during September morphs into the following directions:
Undertake precautions - It is suggested to shield oneself from sunburn. Considering the strength of solar radiation at midday, one should avoid direct Sun exposure. Tightly woven clothing, when worn loosely, shields effectively against the Sun. Take careful note! The UV radiation of the Sun can be nearly doubled by snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in September?
What is the average humidity in September?
What is the driest month?
How many days does it rain in September?
When it does not snow?
Does it snow in September?
How many hours of daylight does Sillsville have in September?
When is the sunrise / sunset in September?
How long on average sun shines in September?
How high is the UV index in September?
Average temperature in September
Sillsville, CO
- Average high temperature in September: 66.2°F
The warmest month (with the highest average high temperature) is July (74.8°F).
The month with the lowest average high temperature is January (26.1°F).
- Average low temperature in September: 37.9°F
The month with the highest average low temperature is July (44.6°F).
The coldest month (with the lowest average low temperature) is January (1.8°F).
Average pressure in September
Sillsville, CO
- Average pressure in September: 30.06"Hg
The month with the highest atmospheric pressure is January (30.23"Hg).
The month with the lowest atmospheric pressure is April (29.94"Hg).
Average wind speed in September
Sillsville, CO
- Average wind speed in September: 4.8mph
The windiest months (with the highest average wind speed) are May and June (6.3mph).
The calmest month (with the lowest average wind speed) is December (4.5mph).
Average humidity in September
Sillsville, CO
- Average humidity in September: 53%
The month with the highest relative humidity is February (88%).
The month with the lowest relative humidity is June (44%).
Average rainfall in September
Sillsville, CO
- Average rainfall in September: 0.35"
The wettest months (with the highest rainfall) are February and March (1.18").
The driest month (with the least rainfall) is September (0.35").
Average rainfall days in September
Sillsville, CO
- Average rainfall days in September: 5.7 days
The month with the highest number of rainy days is July (10.3 days).
The month with the least rainy days is October (4.1 days).
Average snowfall in September
Sillsville, CO
- Average snowfall in September: 0"
The month with the highest snowfall is February (9.37").
The months with the least snowfall are July, August and September (0").
Average snowfall days in September
Sillsville, CO
- Average snowfall days in September: 0.4 days
The month with the highest number of snowfall days is February (16.2 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in September /
Average sunshine in September
Sillsville, CO
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in September: 11h and 1min
The month with the most sunshine is June (Average sunshine: 12h and 0min).
The month with the least sunshine is February (Average sunshine: 6h and 24min).
Average sunshine days in September
Sillsville, CO
- Average sunshine days in September: 21.3 days
The month with the most sunshine days is June (23.1 days).
The month with the least sunshine days is February (10.3 days).
Average UV index in September
Sillsville, CO
- Average UV index in September: 3
The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are January, February, March, April, October, November and December (UV index 2).
Average cloud cover in September
Sillsville, CO
- Average cloud cover in September: 12
The month with the most cloud cover is February (Cloud cover 35).
The months with the least cloud cover are June and September (Cloud cover 12).
Average visibility in September
Sillsville, 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 and February (4mi).
Sillsville, Colorado, USA
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