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
As September begins, there is a minor decrease in the average high-temperature, softly falling from a hot 86.4°F (30.2°C) in August to a warm 78.4°F (25.8°C). The nighttime temperature shows a significant divergence from the daytime highs, averaging at a fresh 52°F (11.1°C) in September.Humidity
In September, the average relative humidity is 43%.Rainfall
In Berthoud, during September, the rain falls for 8.6 days and regularly aggregates up to 0.75" (19mm) of precipitation. Throughout the year, there are 109.5 rainfall days, and 11.34" (288mm) of precipitation is accumulated.Snowfall
June through September are months without snowfall.Daylight
The average length of the day in September is 12h and 26min.On the first day of September in Berthoud, sunrise is at 6:28 am and sunset at 7:31 pm. On the last day of the month, sunrise is at 6:56 am and sunset at 6:43 pm MDT.
Sunshine
In Berthoud, the average sunshine in September is 10.9h.UV index
In Berthoud, the average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV rays for the ordinary person.Note: During September, 4 as the daily maximum UV index converts into the following advice:
Take precautions. Light skin individuals may get burned in less than 30 minutes. To avoid the Sun's strongest rays, limit exposure around the mid-day period. Always opt for UVA and UVB-resistant sunglasses on radiant days. Alert! The snow's reflection can amplify the UV radiation of the Sun nearly twice.
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 in Berthoud?
How many days does it rain in September?
When it does not snow?
Does it snow in September?
What is the average length of the day in September in Berthoud?
When is the sunrise / sunset in September?
How long on average sun shines in September?
What is the UV index reading in September?
Average temperature in September
Berthoud, CO
- Average high temperature in September: 78.4°F
The warmest month (with the highest average high temperature) is July (86.9°F).
The month with the lowest average high temperature is December (39.4°F).
- Average low temperature in September: 52°F
The month with the highest average low temperature is July (59.7°F).
The coldest month (with the lowest average low temperature) is December (20.7°F).
Average pressure in September
Berthoud, CO
- Average pressure in September: 29.99"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed in September
Berthoud, CO
- Average wind speed in September: 5.8mph
The windiest month (with the highest average wind speed) is April (7.1mph).
The calmest months (with the lowest average wind speed) are August and December (5.7mph).
Average humidity in September
Berthoud, CO
- Average humidity in September: 43%
The month with the highest relative humidity is February (65%).
The month with the lowest relative humidity is August (42%).
Average rainfall in September
Berthoud, CO
- Average rainfall in September: 0.75"
The wettest month (with the highest rainfall) is May (2.2").
The driest month (with the least rainfall) is January (0.31").
Average rainfall days in September
Berthoud, CO
- Average rainfall days in September: 8.6 days
The month with the highest number of rainy days is July (16.4 days).
The month with the least rainy days is January (3 days).
Average snowfall in September
Berthoud, CO
- Average snowfall in September: 0"
The month with the highest snowfall is April (4.72").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Berthoud, CO
- Average snowfall days in September: 0.1 days
The month with the highest number of snowfall days is February (9.4 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Berthoud, 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 24min).
- Average sunshine in September: 10h and 5min
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 48min).
Average sunshine days in September
Berthoud, CO
- Average sunshine days in September: 17 days
The month with the most sunshine days is January (23.9 days).
The month with the least sunshine days is July (7.8 days).
Average UV index in September
Berthoud, CO
- Average UV index in September: 4
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in September
Berthoud, CO
- Average cloud cover in September: 16
The months with the most cloud cover are April and May (Cloud cover 27).
The month with the least cloud cover is September (Cloud cover 16).
Average visibility in September
Berthoud, 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).
Berthoud, Colorado, USA
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