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
In Thornton, the average high-temperature in September marginally drops from a tropical 87.1°F (30.6°C) in August to a warm 79.5°F (26.4°C). In Thornton, Colorado, the average low-temperature is 53.8°F (12.1°C).Humidity
The average relative humidity in September is 41%.Rainfall
In Thornton, during 3.3 rainfall days, 0.16" (4mm) of precipitation is typically accumulated. Throughout the year, in Thornton, there are 48.3 rainfall days, and 3.19" (81mm) of precipitation is accumulated.Snowfall
In Thornton, Colorado, snow does not fall in June through September.Daylight
The average length of the day in September in Thornton, Colorado, is 12h and 26min.On the first day of September, sunrise is at 6:27 am and sunset at 7:31 pm. On the last day of the month, sunrise is at 6:55 am and sunset at 6:44 pm MDT.
Sunshine
The average sunshine in September is 11.1h.UV index
The average daily maximum UV index in September in Thornton is 5. A UV Index estimate of 3 to 5 represents a medium vulnerability from unprotected exposure to Sun's UV rays for average individuals.Note: In September, the average maximum UV index of 5 translate into the following recommendations:
Take precautions. Light skin individuals may get burned in less than 30 minutes. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
FAQ
What is the temperature in September in Thornton?
What is the average humidity in September in Thornton?
How much does it rain in Thornton in September?
When it does not snow in Thornton?
Does it snow in Thornton in September?
How many hours of daylight does Thornton have in September?
When are sunrise and sunset in September in Thornton?
How long on average sun shines in September in Thornton?
What is the UV index intensity in September in Thornton?
Average temperature in September
Thornton, CO
- Average high temperature in September: 79.5°F
The warmest month (with the highest average high temperature) is July (88.3°F).
The month with the lowest average high temperature is December (41.2°F).
- Average low temperature in September: 53.8°F
The month with the highest average low temperature is July (61.7°F).
The coldest month (with the lowest average low temperature) is December (21.9°F).
Average pressure in September
Thornton, CO
- Average pressure in September: 30"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
Thornton, CO
- Average wind speed in September: 5.9mph
The windiest month (with the highest average wind speed) is April (6.9mph).
The calmest month (with the lowest average wind speed) is December (5.8mph).
Average humidity in September
Thornton, CO
- Average humidity in September: 41%
The month with the highest relative humidity is February (64%).
The month with the lowest relative humidity is August (39%).
Average rainfall in September
Thornton, CO
- Average rainfall in September: 0.16"
The wettest month (with the highest rainfall) is July (0.59").
The driest months (with the least rainfall) are January and December (0.08").
Average rainfall days in September
Thornton, CO
- Average rainfall days in September: 3.3 days
The month with the highest number of rainy days is July (8.2 days).
The month with the least rainy days is February (1.2 days).
Average snowfall in September
Thornton, CO
- Average snowfall in September: 0"
The month with the highest snowfall is October (1.42").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Thornton, CO
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (4.7 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Thornton, CO
- Average daylight in September: 12h and 26min
The month with the longest days is June (Average daylight: 14h and 57min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in September: 11h and 6min
The months with the most sunshine are June and July (Average sunshine: 11h and 54min).
The month with the least sunshine is February (Average sunshine: 6h and 42min).
Average sunshine days in September
Thornton, CO
- Average sunshine days in September: 24.5 days
The month with the most sunshine days is December (28.5 days).
The month with the least sunshine days is July (19.6 days).
Average UV index in September
Thornton, 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
Thornton, CO
- Average cloud cover in September: 14
The months with the most cloud cover are February, April and May (Cloud cover 25).
The month with the least cloud cover is September (Cloud cover 14).
Average visibility in September
Thornton, 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).
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