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 the transition to September, Keystone observes a minor drop in the average high-temperature, shifting from 85.6°F (29.8°C) in August to a still warm 78.3°F (25.7°C). Keystone anticipates a stark contrast in temperature during September nights, with an average low of 56.5°F (13.6°C).Humidity
September is the least humid month, with an average relative humidity of 53%.Rainfall
In Keystone, in September, during 9.8 rainfall days, 1.02" (26mm) of precipitation is typically accumulated. Throughout the year, in Keystone, there are 117.3 rainfall days, and 17.28" (439mm) of precipitation is accumulated.Snowfall
June through September are months without snowfall.Daylight
In September, the average length of the day is 12h and 28min.On the first day of the month, sunrise is at 6:13 am and sunset at 7:18 pm. On the last day of September, in Keystone, sunrise is at 6:42 am and sunset at 6:29 pm MDT.
Sunshine
In September, the average sunshine in Keystone is 9.8h.UV index
In September, the average daily maximum UV index in Keystone is 5. A UV Index value of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV rays for the average person.Note: A daily high UV index of 5 in September leads to these guidelines:
Take measures. Individuals with light skin might experience burns in under 30 minutes. During midday, the Sun's radiation is strongest, and it's advisable to reduce direct exposure. Sunglasses that guard against UVA and UVB rays are pivotal in minimizing sun-induced ocular damage.
Frequently asked questions
What are the temperatures in Keystone in September?
What is the least humid month in Keystone?
What is the average humidity in September in Keystone?
How many days does it rain in September in Keystone?
When it does not snow in Keystone?
Does it snow in Keystone in September?
What is the average length of the day in September in Keystone?
When is the sunrise / sunset in September in Keystone?
How long on average sun shines in September in Keystone?
What is the UV index intensity in September in Keystone?
Average temperature in September
Keystone, NE
- Average high temperature in September: 78.3°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 (37.4°F).
- Average low temperature in September: 56.5°F
The month with the highest average low temperature is July (65.8°F).
The coldest months (with the lowest average low temperature) are January and December (22.3°F).
Average pressure in September
Keystone, NE
- Average pressure in September: 29.94"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.83"Hg).
Average wind speed in September
Keystone, NE
- Average wind speed in September: 10.6mph
The windiest month (with the highest average wind speed) is April (12.6mph).
The calmest month (with the lowest average wind speed) is August (9.6mph).
Average humidity in September
Keystone, NE
- Average humidity in September: 53%
The month with the highest relative humidity is January (70%).
The month with the lowest relative humidity is September (53%).
Average rainfall in September
Keystone, NE
- Average rainfall in September: 1.02"
The wettest month (with the highest rainfall) is May (3.39").
The driest month (with the least rainfall) is January (0.39").
Average rainfall days in September
Keystone, NE
- Average rainfall days in September: 9.8 days
The month with the highest number of rainy days is May (17 days).
The month with the least rainy days is December (3.8 days).
Average snowfall in September
Keystone, NE
- Average snowfall in September: 0"
The month with the highest snowfall is February (3.23").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Keystone, NE
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (8.5 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Keystone, NE
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in September: 9h and 5min
The months with the most sunshine are July and August (Average sunshine: 11h and 24min).
The month with the least sunshine is February (Average sunshine: 6h and 0min).
Average sunshine days in September
Keystone, NE
- Average sunshine days in September: 16.5 days
The month with the most sunshine days is November (22.7 days).
The months with the least sunshine days are May and June (10.6 days).
Average UV index in September
Keystone, NE
- Average UV index in September: 5
The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in September
Keystone, NE
- Average cloud cover in September: 20
The month with the most cloud cover is February (Cloud cover 36).
The months with the least cloud cover are July, August and September (Cloud cover 20).
Average visibility in September
Keystone, NE
- 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).
Keystone, Nebraska, USA
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