September weather forecastDillon, CO
September
Weather in September
In September, Dillon experiences unexpected weather modifications, with snowfall observing a slight increase to 1.97" (50mm). This unexpected snow signifies the imminent arrival of autumn. With the trees flaunting shades of red, orange, and gold, the town turns into an artist's dream. Days start to get shorter as evenings come knocking early. A noticeable difference in temperature can be felt, hinting towards cooler days ahead.Temperature
Dillon in September undergoes a slight reduction in the average high-temperature, shifting from August's enjoyable 64.9°F (18.3°C) to a mild 58.5°F (14.7°C). September nights present a stark temperature decrease to a cold 33.4°F (0.8°C).Humidity
In September, the average relative humidity is 58%.Rainfall
In Dillon, in September, during 12.5 rainfall days, 1.54" (39mm) of precipitation is typically accumulated. In Dillon, during the entire year, the rain falls for 111.5 days and collects up to 23.19" (589mm) of precipitation.Snowfall
Months with snowfall are January through December. In Dillon, in September, during 5.8 snowfall days, 1.97" (50mm) of snow is typically accumulated. Throughout the year, there are 149 snowfall days, and 108.54" (2757mm) of snow is accumulated.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
The average sunshine in September is 10.7h.UV index
In September, the average daily maximum UV index is 2. A UV Index of 2, and less, symbolizes a low health risk from exposure to the Sun's UV rays for ordinary individuals.Note: In September, a daily maximum UV index of 2 leads to the following instructions:
While most individuals can withstand prolonged sun exposure, it is imperative that babies, children, and those with sensitive skin always be shielded. The mid-day Sun emits the most powerful UV radiation, so seek shade and minimize exposure. During bright days, sunglasses that offer UVA and UVB defense are recommended. Note well! The intensity of the Sun's UV rays can be nearly doubled by snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Dillon, CO
- Average high temperature in September: 58.5°F
The warmest month (with the highest average high temperature) is July (67.1°F).
The month with the lowest average high temperature is December (22.5°F).
- Average low temperature in September: 33.4°F
The month with the highest average low temperature is July (39.7°F).
The coldest month (with the lowest average low temperature) is December (0.9°F).
Average pressure in September
Dillon, CO
- Average pressure in September: 30.04"Hg
The month with the highest atmospheric pressure is January (30.19"Hg).
The month with the lowest atmospheric pressure is April (29.93"Hg).
Average wind speed in September
Dillon, CO
- Average wind speed in September: 5.3mph
The windiest month (with the highest average wind speed) is February (7mph).
The calmest month (with the lowest average wind speed) is August (4.9mph).
Average humidity in September
Dillon, 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
Dillon, CO
- Average rainfall in September: 1.54"
The wettest month (with the highest rainfall) is July (3.39").
The driest month (with the least rainfall) is January (1.06").
Average rainfall days in September
Dillon, CO
- Average rainfall days in September: 12.5 days
The month with the highest number of rainy days is July (22.7 days).
The month with the least rainy days is November (2.8 days).
Average snowfall in September
Dillon, CO
- Average snowfall in September: 1.97"
The month with the highest snowfall is April (18.27").
The month with the least snowfall is July (0.47").
Average snowfall days in September
Dillon, CO
- Average snowfall days in September: 5.8 days
The month with the highest number of snowfall days is April (21 days).
The month with the least snowfall days is July (1.8 days).
Average daylight in September /
Average sunshine in September
Dillon, CO
- Average daylight in September: 12h and 24min
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 42min
The month with the most sunshine is June (Average sunshine: 11h and 24min).
The month with the least sunshine is February (Average sunshine: 5h and 24min).
Average sunshine days in September
Dillon, CO
- Average sunshine days in September: 12.6 days
The month with the most sunshine days is November (17.5 days).
The month with the least sunshine days is July (5.3 days).
Average UV index in September
Dillon, CO
- Average UV index in September: 2
The months with the highest UV index are July and August (UV index 4).
The months with the lowest UV index are February, November and December (UV index 1).
Average cloud cover in September
Dillon, CO
- Average cloud cover in September: 21
The month with the most cloud cover is February (Cloud cover 51).
The month with the least cloud cover is June (Cloud cover 19).
Average visibility in September
Dillon, 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).
