September weather forecast
Gregory, SD

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Weather in September

The first month of the autumn, September, is still a warm month in Gregory, South Dakota, with temperature in the range of an average low of 56.3°F (13.5°C) and an average high of 76.6°F (24.8°C).

Temperature

In the transition to September, Gregory observes a drop in the average high-temperature, moving from 85.8°F (29.9°C) in August to a still moderately hot 76.6°F (24.8°C). Gregory experiences an average low-temperature of 56.3°F (13.5°C) in the month of September.

Humidity

August and September, with an average relative humidity of 57%, are the least humid months in Gregory.

Rainfall

In September, in Gregory, the rain falls for 9.5 days. Throughout September, 1.34" (34mm) of precipitation is accumulated. Throughout the year, there are 103.9 rainfall days, and 16.85" (428mm) of precipitation is accumulated.

Snowfall

In Gregory, snow does not fall in June through September.

Daylight

In September, the average length of the day is 12h and 29min.
On the first day of September, sunrise is at 7:02 am and sunset at 8:12 pm. On the last day of the month, sunrise is at 7:34 am and sunset at 7:20 pm CDT.

Sunshine

In Gregory, the average sunshine in September is 9h.

UV index

The average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV radiation for ordinary individuals.
Note: The maximum daily UV index of 5 in September interprets into the following recommendations:
Preventative actions are necessary - Recommendations to ward off sunburn are given. To prevent harmful UV exposure, minimize direct contact with the Sun around midday. By wearing a generously brimmed hat, you can cut UV radiation exposure significantly.
Updated: Jul 28, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What are September temperatures?

During September, Gregory experiences an average high-temperature of 76.6°F (24.8°C) and a low-temperature of 56.3°F (13.5°C). The average heat index (a.k.a. 'feels like', 'apparent temperature'), which takes the relative humidity and factors it into the air temperature reading, in August is evaluated at 89.6°F (32°C).

What is the least humid month in Gregory?

The months with the lowest humidity are August and September, with an average relative humidity of 57%.

What is the average humidity in September?

In Gregory, the average relative humidity in September is 57%.

How many days does it rain in September?

In Gregory, in September, during 9.5 rainfall days, 1.34" (34mm) of precipitation is typically accumulated.

When it does not snow?

June through September are months without snowfall.

Does it snow in September?

In Gregory, in September, it doesn't snow. In October, it regularly snows.

What is the average length of the day in September?

The average day length in September is 12h and 29min.

When is the sunrise / sunset in September?

On the first day of September, sunrise is at 7:02 am and sunset at 8:12 pm. On the last day of the month, sunrise is at 7:34 am and sunset at 7:20 pm CDT.

How many hours of sunshine does Gregory have in September?

In September, the average sunshine duration is 9h.

How high is the UV index in September?

In Gregory, the average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a moderate health threat from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Gregory, SD

Average temperature in September - Gregory, SD
  • Average high temperature in September: 76.6°F

The warmest month (with the highest average high temperature) is July (88°F).
The month with the lowest average high temperature is January (28.8°F).

  • Average low temperature in September: 56.3°F

The month with the highest average low temperature is July (66.7°F).
The coldest month (with the lowest average low temperature) is January (15.6°F).

Average pressure in September
Gregory, SD

Average pressure in September - Gregory, SD
  • Average pressure in September: 29.95"Hg

The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.84"Hg).

Average wind speed in September
Gregory, SD

Average wind speed in September - Gregory, SD
  • Average wind speed in September: 10.7mph

The windiest month (with the highest average wind speed) is April (11.9mph).
The calmest month (with the lowest average wind speed) is August (9.8mph).

Average humidity in September
Gregory, SD

Average humidity in September - Gregory, SD
  • Average humidity in September: 57%

The month with the highest relative humidity is January (82%).
The months with the lowest relative humidity are August and September (57%).

Average rainfall in September
Gregory, SD

Average rainfall in September - Gregory, SD
  • Average rainfall in September: 1.34"

The wettest month (with the highest rainfall) is June (2.8").
The driest month (with the least rainfall) is January (0.47").

Average rainfall days in September
Gregory, SD

Average rainfall days in September - Gregory, SD
  • Average rainfall days in September: 9.5 days

The month with the highest number of rainy days is June (15.3 days).
The months with the least rainy days are January and February (2.7 days).

Average snowfall in September
Gregory, SD

Average snowfall in September - Gregory, SD
  • Average snowfall in September: 0"

The month with the highest snowfall is December (3.19").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in September
Gregory, SD

Average snowfall days in September - Gregory, SD
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (9.6 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average daylight in September /
Average sunshine in September
Gregory, SD

Average daylight in September / Average sunshine in September - Gregory, SD
  • Average daylight in September: 12h and 3min

The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 0min).

  • Average sunshine in September: 9h and 0min

The month with the most sunshine is July (Average sunshine: 11h and 24min).
The month with the least sunshine is January (Average sunshine: 4h and 54min).

Average sunshine days in September
Gregory, SD

Average sunshine days in September - Gregory, SD
  • Average sunshine days in September: 17.9 days

The month with the most sunshine days is November (20.8 days).
The month with the least sunshine days is June (11.2 days).

Average UV index in September
Gregory, SD

Average UV index in September - Gregory, SD
  • Average UV index in September: 5

The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is December (UV index 1).

Average cloud cover in September
Gregory, SD

Average cloud cover in September - Gregory, SD
  • Average cloud cover in September: 22

The month with the most cloud cover is January (Cloud cover 47).
The months with the least cloud cover are July and August (Cloud cover 20).

Average visibility in September
Gregory, SD

Average visibility in September - Gregory, 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).

Gregory, South Dakota, USA

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