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
The move into September indicates a slight reduction in the average high-temperature, down from August's pleasant 71.6°F (22°C) to a comfortable 64.4°F (18°C). Contrasted against daytime highs, Walden records an average nighttime low of 39.4°F (4.1°C) in September.Humidity
In September, the average relative humidity is 51%.Rainfall
In September, the rain falls for 7.2 days. Throughout September, 0.55" (14mm) of precipitation is accumulated. Throughout the year, there are 88.8 rainfall days, and 13.19" (335mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through June, September through December. September is the first month it typically snows. Throughout September, in the average 1.4 snowfall days, it receives 0.51" (13mm) of snow. Throughout the year, there are 125.8 snowfall days, and 76.73" (1949mm) of snow is accumulated.Daylight
In September, the average length of the day is 12h and 27min.On the first day of the month, sunrise is at 6:32 am and sunset at 7:36 pm. On the last day of September, sunrise is at 7:01 am and sunset at 6:48 pm MDT.
Sunshine
In Walden, the average sunshine in September is 11.1h.UV index
In September, the average daily maximum UV index is 3. A UV Index value of 3 to 5 symbolizes a medium health hazard from unprotected exposure to Sun's UV rays for the average person.Note: The average daily UV index of 3 in September transforms into the following instructions:
Exercise prevention - Precautions against solar damage are endorsed. Avoiding direct sunlight during midday hours helps reduce the risk from intense UV radiation. Clothes that are both tight-knit and comfortably loose are prime choices for sun protection. Take heed! The reflection of snow can intensify the Sun's UV radiation nearly double.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are September temperatures?
What is the average humidity in September?
How much does it rain in September?
When does it start to snow in Walden?
How many hours of daylight does Walden have in September?
When is the sunrise / sunset in September?
How long on average sun shines in September?
What is the UV index reading in September in Walden?
Average temperature in September
Walden, CO
- Average high temperature in September: 64.4°F
The warmest month (with the highest average high temperature) is July (73°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 (46.2°F).
The coldest month (with the lowest average low temperature) is January (7.3°F).
Average pressure in September
Walden, CO
- Average pressure in September: 30.01"Hg
The month with the highest atmospheric pressure is January (30.22"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in September
Walden, CO
- Average wind speed in September: 7.2mph
The windiest month (with the highest average wind speed) is February (8.6mph).
The calmest month (with the lowest average wind speed) is July (6.4mph).
Average humidity in September
Walden, CO
- Average humidity in September: 51%
The month with the highest relative humidity is February (88%).
The month with the lowest relative humidity is June (49%).
Average rainfall in September
Walden, CO
- Average rainfall in September: 0.55"
The wettest month (with the highest rainfall) is April (1.77").
The driest month (with the least rainfall) is August (0.39").
Average rainfall days in September
Walden, CO
- Average rainfall days in September: 7.2 days
The month with the highest number of rainy days is May (10.8 days).
The month with the least rainy days is November (4.5 days).
Average snowfall in September
Walden, CO
- Average snowfall in September: 0.51"
The month with the highest snowfall is April (12.48").
The months with the least snowfall are July and August (0").
Average snowfall days in September
Walden, CO
- Average snowfall days in September: 1.4 days
The month with the highest number of snowfall days is February (20.1 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in September /
Average sunshine in September
Walden, CO
- Average daylight in September: 12h and 2min
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: 11h and 1min
The month with the most sunshine is June (Average sunshine: 11h and 48min).
The month with the least sunshine is February (Average sunshine: 5h and 36min).
Average sunshine days in September
Walden, CO
- Average sunshine days in September: 20.1 days
The month with the most sunshine days is August (21.3 days).
The month with the least sunshine days is February (8.9 days).
Average UV index in September
Walden, 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 and December (UV index 1).
Average cloud cover in September
Walden, CO
- Average cloud cover in September: 14
The month with the most cloud cover is February (Cloud cover 49).
The month with the least cloud cover is September (Cloud cover 14).
Average visibility in September
Walden, CO
- Average visibility in September: 6mi
The months with the highest visibility are May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January and February (4mi).
Walden, Colorado, USA
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