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's arrival comes with a mild decrease in the average high-temperature, moving subtly from 82.8°F (28.2°C) in August to a still moderately hot 73.9°F (23.3°C). Throughout the month of September, the nighttime temperature dips to an average of 54°F (12.2°C).Humidity
August and September, with an average relative humidity of 50%, are the least humid months.Rainfall
In Hermosa, during September, the rain falls for 7.8 days and regularly aggregates up to 0.94" (24mm) of precipitation. Throughout the year, there are 118.8 rainfall days, and 15.39" (391mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through May, September through December. September is the first month it typically snows in Hermosa. Throughout September, in the average 0.1 snowfall days, it receives 0.12" (3mm) of snow. In Hermosa, during the entire year, snow falls for 50.4 days and aggregates up to 24.41" (620mm) of snow.Daylight
In Hermosa, the average length of the day in September is 12h and 29min.On the first day of September, sunrise is at 6:17 am and sunset at 7:27 pm. On the last day of the month, sunrise is at 6:50 am and sunset at 6:34 pm MDT.
Sunshine
The average sunshine in September is 10.4h.UV index
In September, the average daily maximum UV index in Hermosa is 4. A UV Index estimate of 3 to 5 represents a medium health hazard from exposure to the Sun's UV radiation for ordinary individuals.Note: In September, the maximum UV index of 4 suggests this advice:
Heed the precautions - It is counselled to guard against solar damage. When the Sun's UV radiation is most intense during midday, it's best to find shade and limit exposure. On sunny days, it's ideal to wear sunglasses that filter out UVA and UVB rays. Take to heart! Snow reflection can almost magnify the Sun's UV radiation twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are September temperatures?
What are the least humid months?
What is the average humidity in September?
How much does it rain in Hermosa in September?
When does it start snowing?
What is the average length of the day in September?
When is the sunrise / sunset in September?
How many hours of sunshine does Hermosa have in September?
What is the UV index reading in September in Hermosa?
Average temperature in September
Hermosa, SD
- Average high temperature in September: 73.9°F
The warmest month (with the highest average high temperature) is July (84.7°F).
The month with the lowest average high temperature is December (32.5°F).
- Average low temperature in September: 54°F
The month with the highest average low temperature is July (63.3°F).
The coldest month (with the lowest average low temperature) is February (17.8°F).
Average pressure in September
Hermosa, SD
- Average pressure in September: 29.93"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.84"Hg).
Average wind speed in September
Hermosa, SD
- Average wind speed in September: 9.1mph
The windiest month (with the highest average wind speed) is April (10.3mph).
The calmest month (with the lowest average wind speed) is August (8.2mph).
Average humidity in September
Hermosa, SD
- Average humidity in September: 50%
The month with the highest relative humidity is January (77%).
The months with the lowest relative humidity are August and September (50%).
Average rainfall in September
Hermosa, SD
- Average rainfall in September: 0.94"
The wettest month (with the highest rainfall) is May (2.28").
The driest month (with the least rainfall) is January (0.43").
Average rainfall days in September
Hermosa, SD
- Average rainfall days in September: 7.8 days
The month with the highest number of rainy days is May (17.1 days).
The month with the least rainy days is December (4.8 days).
Average snowfall in September
Hermosa, SD
- Average snowfall in September: 0.12"
The month with the highest snowfall is April (5.43").
The months with the least snowfall are June, July and August (0").
Average snowfall days in September
Hermosa, SD
- Average snowfall days in September: 0.1 days
The month with the highest number of snowfall days is February (10.5 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Hermosa, SD
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 24min).
The month with the shortest days is December (Average daylight: 9h and 0min).
- Average sunshine in September: 10h and 2min
The month with the most sunshine is August (Average sunshine: 11h and 48min).
The month with the least sunshine is February (Average sunshine: 5h and 54min).
Average sunshine days in September
Hermosa, SD
- Average sunshine days in September: 19.9 days
The month with the most sunshine days is November (20.2 days).
The month with the least sunshine days is May (11 days).
Average UV index in September
Hermosa, SD
- Average UV index in September: 4
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in September
Hermosa, SD
- Average cloud cover in September: 18
The months with the most cloud cover are February and April (Cloud cover 38).
The month with the least cloud cover is August (Cloud cover 16).
Average visibility in September
Hermosa, SD
- 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).
Hermosa, South Dakota, USA
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