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 brings a slight decrease in the average high-temperature, shifting from a warm 84.4°F (29.1°C) in August to a still moderately hot 77.7°F (25.4°C). A marked drop from daytime peak temperatures to an average low-temperature of 52.2°F (11.2°C) is observed during the nights in September.Humidity
The average relative humidity in September is 43%.Rainfall
In Highlands Ranch, during September, the rain falls for 6 days and regularly aggregates up to 0.43" (11mm) of precipitation. Throughout the year, in Highlands Ranch, there are 77.1 rainfall days, and 10.16" (258mm) of precipitation is accumulated.Snowfall
In Highlands Ranch, snow does not fall in June through September.Daylight
The average length of the day in September is 12h and 26min.On the first day of the month, sunrise is at 6:28 am and sunset at 7:30 pm. On the last day of September, in Highlands Ranch, sunrise is at 6:55 am and sunset at 6:43 pm MDT.
Sunshine
In September, the average sunshine is 11.1h.UV index
In September, the average daily maximum UV index is 5. A UV Index estimate of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV radiation for average individuals.Note: In September, the average maximum UV index of 5 translates into the following recommendations:
Undertake precautions - Guarding against sun damage is counselled. Limiting sun exposure during midday hours helps in reducing the harmful effects of UV radiation. Employ a wide-brim hat for potent defense against up to 50% of UV rays. 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 are the temperatures in Highlands Ranch in September?
What is the average humidity in September?
How much 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 Highlands Ranch?
What time are sunrise and sunset in September?
How long on average sun shines in September?
What is the UV index intensity in September?
Average temperature in September
Highlands Ranch, CO
- Average high temperature in September: 77.7°F
The warmest month (with the highest average high temperature) is July (85.6°F).
The month with the lowest average high temperature is December (41.2°F).
- Average low temperature in September: 52.2°F
The month with the highest average low temperature is July (58.6°F).
The coldest month (with the lowest average low temperature) is December (20.7°F).
Average pressure in September
Highlands Ranch, CO
- Average pressure in September: 30.01"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The months with the lowest atmospheric pressure are April and June (29.91"Hg).
Average wind speed in September
Highlands Ranch, CO
- Average wind speed in September: 6.4mph
The windiest month (with the highest average wind speed) is April (7.3mph).
The calmest months (with the lowest average wind speed) are August and September (6.4mph).
Average humidity in September
Highlands Ranch, CO
- Average humidity in September: 43%
The month with the highest relative humidity is February (65%).
The months with the lowest relative humidity are June and August (42%).
Average rainfall in September
Highlands Ranch, CO
- Average rainfall in September: 0.43"
The wettest month (with the highest rainfall) is May (1.61").
The driest month (with the least rainfall) is January (0.39").
Average rainfall days in September
Highlands Ranch, CO
- Average rainfall days in September: 6 days
The month with the highest number of rainy days is July (11.8 days).
The month with the least rainy days is January (1.5 days).
Average snowfall in September
Highlands Ranch, CO
- Average snowfall in September: 0"
The month with the highest snowfall is February (5.75").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Highlands Ranch, CO
- Average snowfall days in September: 0.1 days
The month with the highest number of snowfall days is February (8.3 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Highlands Ranch, CO
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in September: 11h and 1min
The month with the most sunshine is June (Average sunshine: 11h and 54min).
The month with the least sunshine is February (Average sunshine: 6h and 48min).
Average sunshine days in September
Highlands Ranch, CO
- Average sunshine days in September: 22 days
The month with the most sunshine days is October (24.5 days).
The month with the least sunshine days is July (16.3 days).
Average UV index in September
Highlands Ranch, 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
Highlands Ranch, CO
- Average cloud cover in September: 14
The months with the most cloud cover are April and May (Cloud cover 25).
The month with the least cloud cover is September (Cloud cover 14).
Average visibility in September
Highlands Ranch, 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).
Highlands Ranch, Colorado, USA
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