September weather forecastHartsel, CO
September
Weather in September
The first month of the autumn, September, is still a comfortable month in Hartsel, Colorado, with temperature in the range of an average low of 39.7°F (4.3°C) and an average high of 64.2°F (17.9°C).Temperature
During the shift to September, a minor reduction in average high-temperature is observed, shifting from an agreeable 70.3°F (21.3°C) in August to a refreshing 64.2°F (17.9°C). September presents a sharp fall from Hartsel's daytime highs to an average low-temperature of 39.7°F (4.3°C).Humidity
The average relative humidity in September is 53%.Rainfall
In Hartsel, in September, during 11.5 rainfall days, 0.94" (24mm) of precipitation is typically accumulated. In Hartsel, during the entire year, the rain falls for 112.5 days and collects up to 14.13" (359mm) of precipitation.Snowfall
January through June, September through December are months with snowfall in Hartsel, Colorado. September is the first month it typically snows in Hartsel. Throughout September, in the average 1 snowfall days, it receives 0.47" (12mm) of snow. In Hartsel, during the entire year, snow falls for 88 days and aggregates up to 51.5" (1308mm) of snow.Daylight
In Hartsel, the average length of the day in September is 12h and 26min.On the first day of September, sunrise is at 6:32 am and sunset at 7:33 pm. On the last day of the month, sunrise is at 6:58 am and sunset at 6:46 pm MDT.
Sunshine
The average sunshine in September in Hartsel is 11.1h.UV index
In September, the average daily maximum UV index in Hartsel, Colorado, is 3. A UV Index estimate of 3 to 5 represents a moderate health risk from unsafe exposure to UV radiation for average individuals.Note: The average daily UV index of 3 in September transforms into the following instructions:
Take precautions. Light skin individuals may get burned in less than 30 minutes. The Sun's radiation is especially intense around midday; try to stay in shade during this period. Experience reduced UV exposure by about half when donning a wide-brim hat. Take precaution! The reflection from snow can almost double the UV radiation of the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Hartsel, CO
- Average high temperature in September: 64.2°F
The warmest month (with the highest average high temperature) is July (71.6°F).
The month with the lowest average high temperature is December (28.4°F).
- Average low temperature in September: 39.7°F
The month with the highest average low temperature is July (45.9°F).
The coldest months (with the lowest average low temperature) are January and December (7.2°F).
Average pressure in September
Hartsel, CO
- Average pressure in September: 30.06"Hg
The month with the highest atmospheric pressure is January (30.18"Hg).
The month with the lowest atmospheric pressure is April (29.93"Hg).
Average wind speed in September
Hartsel, CO
- Average wind speed in September: 5.6mph
The windiest month (with the highest average wind speed) is February (7.5mph).
The calmest month (with the lowest average wind speed) is August (4.9mph).
Average humidity in September
Hartsel, CO
- Average humidity in September: 53%
The month with the highest relative humidity is February (82%).
The month with the lowest relative humidity is June (45%).
Average rainfall in September
Hartsel, CO
- Average rainfall in September: 0.94"
The wettest month (with the highest rainfall) is July (2.64").
The driest months (with the least rainfall) are January and November (0.51").
Average rainfall days in September
Hartsel, CO
- Average rainfall days in September: 11.5 days
The month with the highest number of rainy days is July (20.2 days).
The month with the least rainy days is November (3.2 days).
Average snowfall in September
Hartsel, CO
- Average snowfall in September: 0.47"
The month with the highest snowfall is April (8.98").
The months with the least snowfall are July and August (0").
Average snowfall days in September
Hartsel, CO
- Average snowfall days in September: 1 days
The month with the highest number of snowfall days is April (13.6 days).
The month with the least snowfall days is August (0 days).
Average daylight in September /
Average sunshine in September
Hartsel, 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 30min).
- Average sunshine in September: 11h and 6min
The month with the most sunshine is June (Average sunshine: 11h and 48min).
The month with the least sunshine is February (Average sunshine: 6h and 42min).
Average sunshine days in September
Hartsel, CO
- Average sunshine days in September: 14.3 days
The month with the most sunshine days is November (21.5 days).
The month with the least sunshine days is July (7 days).
Average UV index in September
Hartsel, CO
- Average UV index in September: 3
The months with the highest UV index are June, July and August (UV index 4).
The months with the lowest UV index are January, February, March, April, October, November and December (UV index 2).
Average cloud cover in September
Hartsel, CO
- Average cloud cover in September: 17
The month with the most cloud cover is February (Cloud cover 31).
The month with the least cloud cover is June (Cloud cover 16).
Average visibility in September
Hartsel, CO
- Average visibility in September: 6mi
The months with the highest visibility are March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January and February (5mi).
