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 signals a slight drop in average high-temperature, sliding from August's moderately hot 81.9°F (27.7°C) to a still warm 75°F (23.9°C). Alcester experiences a nighttime temperature average of 54.7°F (12.6°C) during September.Humidity
The average relative humidity in September in Alcester is 70%.Rainfall
In Alcester, in September, it is raining for 9.1 days, with typically 1.14" (29mm) of accumulated precipitation. In Alcester, during the entire year, the rain falls for 97.4 days and collects up to 11.89" (302mm) of precipitation.Snowfall
June through September are months without snowfall in Alcester.Daylight
The average length of the day in September is 12h and 29min.On the first day of September, sunrise is at 6:51 am and sunset at 8:00 pm. On the last day of the month, sunrise is at 7:23 am and sunset at 7:08 pm CDT.
Sunshine
In Alcester, the average sunshine in September is 8.9h.UV index
The average daily maximum UV index in September in Alcester is 5. A UV Index value of 3 to 5 symbolizes a moderate health risk from unsafe exposure to UV radiation for the ordinary person.Note: In September, the maximum UV index of 5 translates into these guidelines:
Preventative actions are necessary - Suggestions to safeguard against sun damage are in order. Considering the harmful UV rays from the Sun during midday, it's essential to reduce exposure. On days when the sun blazes, arm yourself with sunglasses that block UVA and UVB radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in Alcester in September?
What is the average humidity in September in Alcester?
How much does it rain in Alcester in September?
When it does not snow in Alcester?
Does it snow in Alcester in September?
What is the average length of the day in September in Alcester?
When are sunrise and sunset in September in Alcester?
How many hours of sunshine does Alcester have in September?
What is the UV index intensity in September in Alcester?
Average temperature in September
Alcester, SD
- Average high temperature in September: 75°F
The warmest month (with the highest average high temperature) is July (83.3°F).
The month with the lowest average high temperature is January (25.2°F).
- Average low temperature in September: 54.7°F
The month with the highest average low temperature is July (64.2°F).
The coldest month (with the lowest average low temperature) is January (11.5°F).
Average pressure in September
Alcester, SD
- Average pressure in September: 29.98"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.86"Hg).
Average wind speed in September
Alcester, SD
- Average wind speed in September: 9.1mph
The windiest month (with the highest average wind speed) is April (11.1mph).
The calmest month (with the lowest average wind speed) is July (7.8mph).
Average humidity in September
Alcester, SD
- Average humidity in September: 70%
The month with the highest relative humidity is January (85%).
The month with the lowest relative humidity is October (66%).
Average rainfall in September
Alcester, SD
- Average rainfall in September: 1.14"
The wettest month (with the highest rainfall) is June (2.05").
The driest months (with the least rainfall) are February and November (0.31").
Average rainfall days in September
Alcester, SD
- Average rainfall days in September: 9.1 days
The month with the highest number of rainy days is June (14.6 days).
The month with the least rainy days is February (2.3 days).
Average snowfall in September
Alcester, SD
- Average snowfall in September: 0"
The month with the highest snowfall is March (1.61").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Alcester, SD
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (8.1 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Alcester, 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 6min).
- Average sunshine in September: 8h and 5min
The month with the most sunshine is July (Average sunshine: 10h and 42min).
The month with the least sunshine is January (Average sunshine: 4h and 18min).
Average sunshine days in September
Alcester, SD
- Average sunshine days in September: 18.4 days
The month with the most sunshine days is December (23.9 days).
The month with the least sunshine days is June (12.3 days).
Average UV index in September
Alcester, SD
- 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
Alcester, SD
- Average cloud cover in September: 28
The month with the most cloud cover is January (Cloud cover 53).
The month with the least cloud cover is July (Cloud cover 26).
Average visibility in September
Alcester, 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).
Alcester, South Dakota, USA
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