September weather forecastEstes Park, CO
September
Weather in September
September indicates the departure of the summer warmth experienced in August. In Estes Park this month observes a decline in the day's length and a dip in temperature, setting the stage for the forthcoming autumn. As the weather cools down from summer highs, the city experiences its last glimpses of rainfall before the winter dry spell. Despite the gradual decline in daylight hours, September still offers around 12.4 hours for various activities.Temperature
The average high-temperature shows a slight dip in September, from August's pleasant 71.2°F (21.8°C) to a comfortable 64.9°F (18.3°C). Estes Park experiences a drastic reduction from day temperatures to an average low of 41.9°F (5.5°C) in September.Humidity
The average relative humidity in September is 51%.Rainfall
In September, the rain falls for 9 days. Throughout September, 1.34" (34mm) of precipitation is accumulated. Throughout the year, there are 117 rainfall days, and 23.35" (593mm) of precipitation is accumulated.Snowfall
Months with snowfall in Estes Park are January through June, August through December. In Estes Park, during September, snow falls for 1.1 days and regularly aggregates up to 0.71" (18mm) of snow. Throughout the year, there are 114.1 snowfall days, and 105.67" (2684mm) of snow is accumulated.Daylight
In September, the average length of the day is 12h and 26min.On the first day of September, sunrise is at 6:30 am and sunset at 7:33 pm. On the last day of the month, sunrise is at 6:58 am and sunset at 6:45 pm MDT.
Sunshine
In Estes Park, Colorado, the average sunshine in September is 10.5h.UV index
The average daily maximum UV index in September is 3. A UV Index of 3 to 5 symbolizes a medium vulnerability from unprotected exposure to Sun's UV rays for the average person.Note: A daily maximum UV index of 3 in September translates into the following instructions:
Be careful. Light complexion individuals might get burns in fewer than 30 minutes. The most potent solar radiation is around mid-day, so one should minimize exposure to direct sunlight during this period. To best shield against UV radiation, choose sun-safe garments and dependable sunglasses. Remember this! The UV radiation of the Sun can be nearly doubled by the reflective properties of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Estes Park, CO
- Average high temperature in September: 64.9°F
The warmest month (with the highest average high temperature) is July (72.5°F).
The month with the lowest average high temperature is December (28.6°F).
- Average low temperature in September: 41.9°F
The month with the highest average low temperature is July (49.3°F).
The coldest months (with the lowest average low temperature) are February and December (12.6°F).
Average pressure in September
Estes Park, CO
- Average pressure in September: 30.01"Hg
The month with the highest atmospheric pressure is January (30.17"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in September
Estes Park, CO
- Average wind speed in September: 6.5mph
The windiest month (with the highest average wind speed) is January (10.2mph).
The calmest month (with the lowest average wind speed) is August (5.8mph).
Average humidity in September
Estes Park, CO
- Average humidity in September: 51%
The month with the highest relative humidity is February (78%).
The month with the lowest relative humidity is June (50%).
Average rainfall in September
Estes Park, CO
- Average rainfall in September: 1.34"
The wettest month (with the highest rainfall) is May (4.02").
The driest month (with the least rainfall) is December (1.02").
Average rainfall days in September
Estes Park, CO
- Average rainfall days in September: 9 days
The month with the highest number of rainy days is July (17.2 days).
The month with the least rainy days is November (3.6 days).
Average snowfall in September
Estes Park, CO
- Average snowfall in September: 0.71"
The month with the highest snowfall is April (21.3").
The month with the least snowfall is July (0").
Average snowfall days in September
Estes Park, CO
- Average snowfall days in September: 1.1 days
The month with the highest number of snowfall days is March (16.8 days).
The month with the least snowfall days is July (0 days).
Average daylight in September /
Average sunshine in September
Estes Park, 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 18min).
- Average sunshine in September: 10h and 30min
The month with the most sunshine is June (Average sunshine: 11h and 12min).
The month with the least sunshine is February (Average sunshine: 6h and 0min).
Average sunshine days in September
Estes Park, CO
- Average sunshine days in September: 19.4 days
The month with the most sunshine days is September (19.4 days).
The month with the least sunshine days is May (8.2 days).
Average UV index in September
Estes Park, 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
Estes Park, CO
- Average cloud cover in September: 22
The months with the most cloud cover are February and May (Cloud cover 39).
The months with the least cloud cover are June and September (Cloud cover 22).
Average visibility in September
Estes Park, CO
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
