September weather forecast
Richmond, SD

Share

Weather in September

The first month of the autumn, September, is also a moderately hot month in Richmond, South Dakota, with an average temperature varying between 74.3°F (23.5°C) and 52.9°F (11.6°C).

Temperature

The shift from August to September coincides with a small decrease in the average high-temperature, down to a still moderately hot 74.3°F (23.5°C) from a warm 83.1°F (28.4°C). Throughout September, an average low-temperature of 52.9°F (11.6°C) is expected in Richmond.

Humidity

The months with the lowest humidity are August and September, with an average relative humidity of 60%.

Rainfall

In Richmond, in September, it is raining for 8.9 days, with typically 1.26" (32mm) of accumulated precipitation. In Richmond, during the entire year, the rain falls for 97.2 days and collects up to 18.35" (466mm) of precipitation.

Snowfall

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

Daylight

In Richmond, the average length of the day in September is 12h and 31min.
On the first day of September, sunrise is at 6:56 am and sunset at 8:11 pm. On the last day of the month, sunrise is at 7:32 am and sunset at 7:15 pm CDT.

Sunshine

In Richmond, the average sunshine in September is 8.7h.

UV index

In September, the average daily maximum UV index is 4. A UV Index reading of 3 to 5 represents a medium health hazard from unsafe exposure to UV radiation for the average person.
Note: In September, a regular UV index of 4 translates into these guidelines:
Ensure safety - Recommendations to avert sunburn are presented. The most potent solar radiation is around mid-day, so one should minimize exposure to direct sunlight during this period. In the presence of strong sunlight, it's crucial to wear sunglasses that ward off UVA and UVB rays.
Updated: Jul 27, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the usual temperature for Richmond in September?

The high-temperature, in September, in Richmond, records 74.3°F (23.5°C), while the low-temperature is 52.9°F (11.6°C). In August, the average heat index (a.k.a. 'feels like', 'apparent temperature'), which factors the actual air temperature with the relative humidity, is estimated at 86°F (30°C).

What are the least humid months?

August and September, with an average relative humidity of 60%, are the least humid months.

What is the average humidity in September in Richmond?

In September, the average relative humidity is 60%.

How much does it rain in September?

In Richmond, in September, during 8.9 rainfall days, 1.26" (32mm) of precipitation is typically accumulated.

When it does not snow?

June through September are months without snowfall.

Does it snow in September?

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

How many hours of daylight does Richmond have in September?

In September, the average day length in Richmond, South Dakota, is 12h and 31min.

What time are sunrise and sunset in September?

On the first day of September, sunrise is at 6:56 am and sunset at 8:11 pm. On the last day of the month, sunrise is at 7:32 am and sunset at 7:15 pm CDT.

How long on average sun shines in September?

In Richmond, the average sunshine duration in September is 8.7h.

How high is the UV index in September?

In September, the average daily maximum UV index is 4. A UV Index estimate 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
Richmond, SD

Average temperature in September - Richmond, SD
  • Average high temperature in September: 74.3°F

The warmest month (with the highest average high temperature) is July (84.7°F).
The month with the lowest average high temperature is January (20.7°F).

  • Average low temperature in September: 52.9°F

The month with the highest average low temperature is July (63.1°F).
The coldest month (with the lowest average low temperature) is January (6.3°F).

Average pressure in September
Richmond, SD

Average pressure in September - Richmond, SD
  • Average pressure in September: 29.96"Hg

The month with the highest atmospheric pressure is February (30.17"Hg).
The month with the lowest atmospheric pressure is June (29.85"Hg).

Average wind speed in September
Richmond, SD

Average wind speed in September - Richmond, SD
  • Average wind speed in September: 9.6mph

The windiest month (with the highest average wind speed) is April (10.6mph).
The calmest month (with the lowest average wind speed) is August (8.3mph).

Average humidity in September
Richmond, SD

Average humidity in September - Richmond, SD
  • Average humidity in September: 60%

The month with the highest relative humidity is January (88%).
The months with the lowest relative humidity are August and September (60%).

Average rainfall in September
Richmond, SD

Average rainfall in September - Richmond, SD
  • Average rainfall in September: 1.26"

The wettest month (with the highest rainfall) is June (3.46").
The driest month (with the least rainfall) is January (0.59").

Average rainfall days in September
Richmond, SD

Average rainfall days in September - Richmond, SD
  • Average rainfall days in September: 8.9 days

The month with the highest number of rainy days is June (15 days).
The month with the least rainy days is February (2 days).

Average snowfall in September
Richmond, SD

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

The month with the highest snowfall is January (3.82").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in September
Richmond, SD

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

The month with the highest number of snowfall days is January (13 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

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

The month with the longest days is June (Average daylight: 15h and 36min).
The month with the shortest days is December (Average daylight: 8h and 48min).

  • Average sunshine in September: 8h and 4min

The month with the most sunshine is July (Average sunshine: 11h and 6min).
The month with the least sunshine is January (Average sunshine: 3h and 54min).

Average sunshine days in September
Richmond, SD

Average sunshine days in September - Richmond, SD
  • Average sunshine days in September: 18.7 days

The month with the most sunshine days is November (20.9 days).
The month with the least sunshine days is June (12.7 days).

Average UV index in September
Richmond, SD

Average UV index in September - Richmond, SD
  • Average UV index in September: 4

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 and November (UV index 1).

Average cloud cover in September
Richmond, SD

Average cloud cover in September - Richmond, SD
  • Average cloud cover in September: 26

The month with the most cloud cover is January (Cloud cover 57).
The months with the least cloud cover are July and August (Cloud cover 23).

Average visibility in September
Richmond, SD

Average visibility in September - Richmond, SD
  • Average visibility in September: 6mi

The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is January (5mi).

Richmond, South Dakota, USA

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location