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
As September begins, there is a minor decrease in the average high-temperature, softly falling from 81.1°F (27.3°C) in August to a still moderately hot 74.3°F (23.5°C). In Lyons, September is marked by an average low-temperature of 53.4°F (11.9°C).Humidity
In Lyons, the average relative humidity in September is 70%.Rainfall
In Lyons, South Dakota, in September, it is raining for 11.7 days, with typically 2.05" (52mm) of accumulated precipitation. In Lyons, during the entire year, the rain falls for 118.3 days and collects up to 22.76" (578mm) of precipitation.Snowfall
June through September are months without snowfall in Lyons.Daylight
In September, the average length of the day in Lyons is 12h and 29min.On the first day of September, sunrise is at 6:51 am and sunset at 8:02 pm. On the last day of the month, sunrise is at 7:24 am and sunset at 7:09 pm CDT.
Sunshine
The average sunshine in September in Lyons is 8.7h.UV index
The average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV rays for average individuals.Note: The average daily UV index of 4 in September transforms into the following instructions:
Ensure safety - Recommendations to avert sunburn are presented. Minimize direct exposure to the Sun during midday when its radiation is at its peak. To cut down UV radiation exposure by about half, sport a wide-brim hat.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the average September temperature in Lyons?
What is the average humidity in September in Lyons?
How many days does it rain in September in Lyons?
When it does not snow in Lyons?
Does it snow in Lyons in September?
What is the average length of the day in September in Lyons?
When are sunrise and sunset in September in Lyons?
How many hours of sunshine does Lyons have in September?
What is the UV index intensity in September in Lyons?
Average temperature in September
Lyons, SD
- Average high temperature in September: 74.3°F
The warmest month (with the highest average high temperature) is July (82.6°F).
The month with the lowest average high temperature is January (22.8°F).
- Average low temperature in September: 53.4°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 (9.3°F).
Average pressure in September
Lyons, SD
- Average pressure in September: 29.97"Hg
The months with the highest atmospheric pressure are January and February (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.85"Hg).
Average wind speed in September
Lyons, SD
- Average wind speed in September: 9.5mph
The windiest month (with the highest average wind speed) is April (11.4mph).
The calmest month (with the lowest average wind speed) is July (8.1mph).
Average humidity in September
Lyons, SD
- Average humidity in September: 70%
The month with the highest relative humidity is January (88%).
The month with the lowest relative humidity is October (67%).
Average rainfall in September
Lyons, SD
- Average rainfall in September: 2.05"
The wettest month (with the highest rainfall) is June (3.62").
The driest month (with the least rainfall) is February (0.63").
Average rainfall days in September
Lyons, SD
- Average rainfall days in September: 11.7 days
The month with the highest number of rainy days is June (18.3 days).
The month with the least rainy days is February (2.6 days).
Average snowfall in September
Lyons, SD
- Average snowfall in September: 0"
The month with the highest snowfall is December (4.21").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Lyons, SD
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (10.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Lyons, 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: 8h and 4min
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 0min).
Average sunshine days in September
Lyons, SD
- Average sunshine days in September: 16.8 days
The month with the most sunshine days is November (21.5 days).
The month with the least sunshine days is June (9.2 days).
Average UV index in September
Lyons, 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 and December (UV index 1).
Average cloud cover in September
Lyons, SD
- Average cloud cover in September: 30
The month with the most cloud cover is January (Cloud cover 57).
The month with the least cloud cover is July (Cloud cover 27).
Average visibility in September
Lyons, 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).
Lyons, South Dakota, USA
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