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 arrival of September suggests a slight decrease in the average high-temperature, moving from a hot 88.2°F (31.2°C) in August to a warm 79.7°F (26.5°C). In September, the temperature registers a significant dip to an average of 54°F (12.2°C) at night.Humidity
In Brighton, the average relative humidity in September is 41%.Rainfall
In Brighton, in September, during 7.2 rainfall days, 0.43" (11mm) of precipitation is typically accumulated. In Brighton, Colorado, during the entire year, the rain falls for 80.6 days and collects up to 5.87" (149mm) of precipitation.Snowfall
June through September are months without snowfall.Daylight
In Brighton, Colorado, the average length of the day in September is 12h and 26min.On the first day of September, sunrise is at 6:27 am and sunset at 7:30 pm. On the last day of the month, sunrise is at 6:55 am and sunset at 6:42 pm MDT.
Sunshine
In September, the average sunshine is 10.9h.UV index
In September, the average daily maximum UV index is 5. A UV Index of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV radiation for average individuals.Note: In September, the maximum UV index of 5 suggests this advice:
Guard yourself - Precautionary measures against sun damage are advocated. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Equip yourself with UVA and UVB-filtering sunglasses on clear, sunny days. Remember to consider! The UV radiation from the Sun can be intensified nearly twice by the reflection of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the temperature in September in Brighton?
What is the average humidity in September?
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?
What time are sunrise and sunset in September?
How long on average sun shines in September?
How high is the UV index in September in Brighton?
Average temperature in September
Brighton, CO
- Average high temperature in September: 79.7°F
The warmest month (with the highest average high temperature) is July (88.9°F).
The month with the lowest average high temperature is December (40.8°F).
- Average low temperature in September: 54°F
The month with the highest average low temperature is July (61.9°F).
The coldest month (with the lowest average low temperature) is December (21.2°F).
Average pressure in September
Brighton, CO
- Average pressure in September: 29.99"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed in September
Brighton, CO
- Average wind speed in September: 6.2mph
The windiest month (with the highest average wind speed) is April (7.5mph).
The calmest month (with the lowest average wind speed) is December (6mph).
Average humidity in September
Brighton, CO
- Average humidity in September: 41%
The months with the highest relative humidity are January and February (64%).
The month with the lowest relative humidity is August (40%).
Average rainfall in September
Brighton, CO
- Average rainfall in September: 0.43"
The wettest month (with the highest rainfall) is May (0.98").
The driest month (with the least rainfall) is December (0.12").
Average rainfall days in September
Brighton, 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 December (2.6 days).
Average snowfall in September
Brighton, CO
- Average snowfall in September: 0"
The month with the highest snowfall is February (1.89").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Brighton, CO
- Average snowfall days in September: 0.1 days
The month with the highest number of snowfall days is February (6.8 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Brighton, 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 months with the most sunshine are June and July (Average sunshine: 11h and 48min).
The month with the least sunshine is February (Average sunshine: 6h and 36min).
Average sunshine days in September
Brighton, CO
- Average sunshine days in September: 18.7 days
The month with the most sunshine days is December (25.8 days).
The month with the least sunshine days is July (14.8 days).
Average UV index in September
Brighton, CO
- Average UV index in September: 5
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
Brighton, CO
- Average cloud cover in September: 16
The month with the most cloud cover is April (Cloud cover 28).
The months with the least cloud cover are June, August and September (Cloud cover 16).
Average visibility in September
Brighton, 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).
Brighton, Colorado, USA
Weather forecast for your location
2. Allow the app to use your location