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
September sees a slight reduction in average high-temperature, with a shift from an agreeable 72.9°F (22.7°C) in August to a comfortable 65.3°F (18.5°C). September nights in Slater see a notable contrast from daytime highs, with the nighttime temperature averaging at a cold 39.4°F (4.1°C).Humidity
In September, the average relative humidity is 52%.Rainfall
In Slater, in September, it is raining for 8.4 days, with typically 0.91" (23mm) of accumulated precipitation. Throughout the year, in Slater, Colorado, there are 83.8 rainfall days, and 19.72" (501mm) of precipitation is accumulated.Snowfall
January through July, September through December are months with snowfall. September is the first month it typically snows. Throughout September, in the average 1.4 snowfall days, it receives 0.59" (15mm) of snow. Throughout the year, there are 127.8 snowfall days, and 116.54" (2960mm) of snow is accumulated.Daylight
In September, the average length of the day is 12h and 27min.On the first day of September, sunrise is at 6:37 am and sunset at 7:41 pm. On the last day of the month, sunrise is at 7:06 am and sunset at 6:53 pm MDT.
Sunshine
In Slater, the average sunshine in September is 10.9h.UV index
The average daily maximum UV index in September is 3. A UV Index reading of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV rays for average individuals.Note: The UV index of 3 during September leads to these advisories:
Exercise caution. The susceptibility of light skin individuals to burns is less than 30 minutes. The best time to avoid the Sun's harmful UV radiation is during midday when it's most potent. Sun protection is enhanced with clothing that boasts a tight weave yet offers a loose fit. Heed this! Snow reflection can almost augment the UV radiation of the sun by double.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for Slater in September?
What is the average humidity in September?
How many days does it rain in September?
When does it start to snow?
How many hours of daylight does Slater have in September?
When is the sunrise / sunset in September?
How many hours of sunshine does Slater have in September?
What is the UV index reading in September?
Average temperature in September
Slater, CO
- Average high temperature in September: 65.3°F
The warmest month (with the highest average high temperature) is July (74.5°F).
The month with the lowest average high temperature is December (23.9°F).
- Average low temperature in September: 39.4°F
The month with the highest average low temperature is July (46.8°F).
The coldest month (with the lowest average low temperature) is January (7°F).
Average pressure in September
Slater, CO
- Average pressure in September: 30.01"Hg
The month with the highest atmospheric pressure is January (30.24"Hg).
The months with the lowest atmospheric pressure are May and June (29.92"Hg).
Average wind speed in September
Slater, CO
- Average wind speed in September: 6.8mph
The windiest month (with the highest average wind speed) is June (7.5mph).
The calmest months (with the lowest average wind speed) are January and December (6.2mph).
Average humidity in September
Slater, CO
- Average humidity in September: 52%
The month with the highest relative humidity is February (90%).
The month with the lowest relative humidity is August (50%).
Average rainfall in September
Slater, CO
- Average rainfall in September: 0.91"
The wettest month (with the highest rainfall) is January (2.44").
The driest month (with the least rainfall) is August (0.83").
Average rainfall days in September
Slater, CO
- Average rainfall days in September: 8.4 days
The months with the highest number of rainy days are May, July and August (11.3 days).
The month with the least rainy days is November (2.5 days).
Average snowfall in September
Slater, CO
- Average snowfall in September: 0.59"
The month with the highest snowfall is January (19.41").
The month with the least snowfall is August (0").
Average snowfall days in September
Slater, CO
- Average snowfall days in September: 1.4 days
The month with the highest number of snowfall days is February (20.3 days).
The month with the least snowfall days is August (0 days).
Average daylight in September /
Average sunshine in September
Slater, CO
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in September: 10h and 5min
The month with the most sunshine is July (Average sunshine: 11h and 48min).
The month with the least sunshine is February (Average sunshine: 4h and 42min).
Average sunshine days in September
Slater, CO
- Average sunshine days in September: 17.5 days
The month with the most sunshine days is October (18.4 days).
The month with the least sunshine days is February (8 days).
Average UV index in September
Slater, 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, November and December (UV index 1).
Average cloud cover in September
Slater, CO
- Average cloud cover in September: 15
The month with the most cloud cover is February (Cloud cover 56).
The months with the least cloud cover are August and September (Cloud cover 15).
Average visibility in September
Slater, 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).
Slater, Colorado, USA
Weather forecast for your location
2. Allow the app to use your location