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
The start of September involves a subtle temperature drop, shifting from a moderately hot 84.4°F (29.1°C) in August to a still warm 76.3°F (24.6°C). Delmont in September experiences a low-temperature average of 55.2°F (12.9°C).Humidity
The average relative humidity in September is 64%.Rainfall
In September, in Delmont, the rain falls for 11.7 days. Throughout September, 1.5" (38mm) of precipitation is accumulated. In Delmont, during the entire year, the rain falls for 106.8 days and collects up to 19.29" (490mm) of precipitation.Snowfall
In Delmont, South Dakota, snow does not fall in May through September.Daylight
The average length of the day in September in Delmont, South Dakota, is 12h and 29min.On the first day of the month, sunrise is at 6:57 am and sunset at 8:07 pm. On the last day of September, sunrise is at 7:29 am and sunset at 7:14 pm CDT.
Sunshine
The average sunshine in September in Delmont is 8.8h.UV index
In September, the average daily maximum UV index is 5. A UV Index value of 3 to 5 symbolizes a medium health hazard from unprotected exposure to Sun's UV rays for the ordinary person.Note: In September, the maximum UV index of 5 suggests this advice:
Exercise prevention - Warding off sunburn is urged. It's crucial to reduce time in the direct Sun around mid-day due to the intense solar radiation. Combat UV radiation's detrimental effects with sun-safe clothing and UV-blocking eyewear.
Frequently asked questions
What is the average September temperature in Delmont?
What is the average humidity in September in Delmont?
How many days does it rain in September in Delmont?
When it does not snow in Delmont?
Does it snow in Delmont in September?
How many hours of daylight does Delmont have in September?
What time are sunrise and sunset in September in Delmont?
How long on average sun shines in September in Delmont?
What is the UV index reading in September in Delmont?
Average temperature in September
Delmont, SD
- Average high temperature in September: 76.3°F
The warmest month (with the highest average high temperature) is July (85.6°F).
The month with the lowest average high temperature is January (26.2°F).
- Average low temperature in September: 55.2°F
The month with the highest average low temperature is July (65.1°F).
The coldest month (with the lowest average low temperature) is January (12.2°F).
Average pressure in September
Delmont, SD
- Average pressure in September: 29.96"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.85"Hg).
Average wind speed in September
Delmont, SD
- Average wind speed in September: 9.6mph
The windiest month (with the highest average wind speed) is April (11.2mph).
The calmest month (with the lowest average wind speed) is July (8.5mph).
Average humidity in September
Delmont, SD
- Average humidity in September: 64%
The month with the highest relative humidity is January (85%).
The month with the lowest relative humidity is October (63%).
Average rainfall in September
Delmont, SD
- Average rainfall in September: 1.5"
The wettest month (with the highest rainfall) is May (3.31").
The driest month (with the least rainfall) is February (0.51").
Average rainfall days in September
Delmont, SD
- Average rainfall days in September: 11.7 days
The month with the highest number of rainy days is June (15.8 days).
The month with the least rainy days is January (2.5 days).
Average snowfall in September
Delmont, SD
- Average snowfall in September: 0"
The month with the highest snowfall is December (2.56").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
Delmont, SD
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is December (7.5 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Delmont, 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: 8h and 5min
The month with the most sunshine is July (Average sunshine: 11h and 0min).
The month with the least sunshine is January (Average sunshine: 4h and 30min).
Average sunshine days in September
Delmont, SD
- Average sunshine days in September: 16.6 days
The month with the most sunshine days is November (22.8 days).
The month with the least sunshine days is June (11.8 days).
Average UV index in September
Delmont, 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
Delmont, SD
- Average cloud cover in September: 26
The month with the most cloud cover is January (Cloud cover 51).
The month with the least cloud cover is July (Cloud cover 23).
Average visibility in September
Delmont, 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).
Delmont, South Dakota, USA
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