September weather forecastYampa, CO
September
Weather in September
The first month of the autumn, September, is still a refreshing month in Yampa, Colorado, with an average temperature varying between 65.3°F (18.5°C) and 38.7°F (3.7°C).Temperature
A modest decline in the average high-temperature is seen during September, decreasing from an agreeable 71.6°F (22°C) in August to a comfortable 65.3°F (18.5°C). In the face of high daytime temperatures, Yampa witnesses a consistent average nighttime low of 38.7°F (3.7°C) during September.Humidity
In Yampa, the average relative humidity in September is 55%.Rainfall
September and November are months with the least rain when the rain falls for 12.7 days and typically aggregates up to 1.61" (41mm) of rain.Snowfall
January through June, September through December are months with snowfall in Yampa. September is the first month it typically snows in Yampa. Throughout September, in the average 1.9 snowfall days, it receives 0.59" (15mm) of snow. In Yampa, during the entire year, snow falls for 145.9 days and aggregates up to 139.69" (3548mm) of snow.Daylight
In September, the average length of the day is 12h and 26min.On the first day of the month, sunrise is at 6:36 am and sunset at 7:38 pm. On the last day of September, in Yampa, Colorado, sunrise is at 7:03 am and sunset at 6:50 pm MDT.
Sunshine
The average sunshine in September is 11h.UV index
The average daily maximum UV index in September in Yampa is 3. A UV Index value of 3 to 5 symbolizes a moderate health risk from unprotected exposure to Sun's UV rays for average individuals.Note: The maximum UV index, 3 during September, leads to the following recommendations:
Undertake protective steps - Recommendations to avoid sunburn are issued. To avoid the Sun's strongest rays, limit exposure around the mid-day period. Consider a wide-brim hat essential for effective sun defense covering your face, neck, and eyes. Mark this! Snow reflection can nearly double the UV radiation intensity from the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Yampa, CO
- Average high temperature in September: 65.3°F
The warmest month (with the highest average high temperature) is July (73.9°F).
The month with the lowest average high temperature is December (25°F).
- Average low temperature in September: 38.7°F
The month with the highest average low temperature is July (45.1°F).
The coldest month (with the lowest average low temperature) is January (5.5°F).
Average pressure in September
Yampa, CO
- Average pressure in September: 30.03"Hg
The month with the highest atmospheric pressure is January (30.24"Hg).
The month with the lowest atmospheric pressure is May (29.93"Hg).
Average wind speed in September
Yampa, CO
- Average wind speed in September: 5.3mph
The windiest month (with the highest average wind speed) is June (6.2mph).
The calmest month (with the lowest average wind speed) is January (4.9mph).
Average humidity in September
Yampa, CO
- Average humidity in September: 55%
The months with the highest relative humidity are January and February (89%).
The month with the lowest relative humidity is June (53%).
Average rainfall in September
Yampa, CO
- Average rainfall in September: 1.61"
The wettest month (with the highest rainfall) is May (3.31").
The driest months (with the least rainfall) are September and November (1.61").
Average rainfall days in September
Yampa, CO
- Average rainfall days in September: 12.7 days
The month with the highest number of rainy days is July (16.6 days).
The month with the least rainy days is February (5.8 days).
Average snowfall in September
Yampa, CO
- Average snowfall in September: 0.59"
The month with the highest snowfall is April (22.72").
The months with the least snowfall are July and August (0").
Average snowfall days in September
Yampa, CO
- Average snowfall days in September: 1.9 days
The month with the highest number of snowfall days is February (21.3 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in September /
Average sunshine in September
Yampa, CO
- Average daylight in September: 12h and 24min
The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in September: 11h and 0min
The months with the most sunshine are June and July (Average sunshine: 11h and 48min).
The month with the least sunshine is February (Average sunshine: 5h and 18min).
Average sunshine days in September
Yampa, CO
- Average sunshine days in September: 14.3 days
The month with the most sunshine days is November (16 days).
The month with the least sunshine days is April (5.3 days).
Average UV index in September
Yampa, 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, November and December (UV index 1).
Average cloud cover in September
Yampa, CO
- Average cloud cover in September: 16
The month with the most cloud cover is February (Cloud cover 50).
The months with the least cloud cover are June, August and September (Cloud cover 16).
Average visibility in September
Yampa, CO
- Average visibility in September: 6mi
The months with the highest visibility are May, June, July, August, September and October (6mi).
The months with the lowest visibility are January, February, March and December (4mi).
