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
With the onset of September, West Salem's average high-temperature clocks in at a still warm 79.2°F (26.2°C), showing a minor fluctuation from the previous month. West Salem, during the month of September, experiences an average low-temperature of 60.8°F (16°C).Humidity
In September, the average relative humidity in West Salem is 73%.Rainfall
September is the month with the least rainfall in West Salem. Rain falls for 8.5 days and accumulates 0.47" (12mm) of precipitation.Snowfall
April through October are months without snowfall in West Salem, Illinois.Daylight
The average length of the day in September is 12h and 25min.On the first day of the month, sunrise is at 6:22 am and sunset at 7:21 pm. On the last day of September, sunrise is at 6:47 am and sunset at 6:35 pm CDT.
Sunshine
In West Salem, the average sunshine in September is 9.2h.UV index
The average daily maximum UV index in September 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: The UV index of 5 during September leads to these advisories:
Take precautions - Protection against sun damage is advised. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Experience reduced UV exposure by about half when donning a wide-brim hat.
Frequently asked questions
What is the temperature in September in West Salem?
What is the average humidity in September in West Salem?
What is the driest month in West Salem?
How much does it rain in West Salem in September?
When it does not snow in West Salem?
How many hours of daylight does West Salem have in September?
What time are sunrise and sunset in September in West Salem?
How long on average sun shines in September in West Salem?
What is the UV index reading in September in West Salem?
Average temperature in September
West Salem, IL
- Average high temperature in September: 79.2°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 (37.8°F).
- Average low temperature in September: 60.8°F
The month with the highest average low temperature is July (67.6°F).
The coldest month (with the lowest average low temperature) is January (25°F).
Average pressure in September
West Salem, IL
- Average pressure in September: 30.03"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).
Average wind speed in September
West Salem, IL
- Average wind speed in September: 6.8mph
The windiest months (with the highest average wind speed) are January and February (10.1mph).
The calmest month (with the lowest average wind speed) is July (5.9mph).
Average humidity in September
West Salem, IL
- Average humidity in September: 73%
The month with the highest relative humidity is July (80%).
The month with the lowest relative humidity is October (70%).
Average rainfall in September
West Salem, IL
- Average rainfall in September: 0.47"
The wettest month (with the highest rainfall) is April (1.3").
The driest month (with the least rainfall) is September (0.47").
Average rainfall days in September
West Salem, IL
- Average rainfall days in September: 8.5 days
The month with the highest number of rainy days is May (14 days).
The month with the least rainy days is January (5.1 days).
Average snowfall in September
West Salem, IL
- Average snowfall in September: 0"
The month with the highest snowfall is January (0.39").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in September
West Salem, IL
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (3.8 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
West Salem, IL
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in September: 9h and 1min
The month with the most sunshine is June (Average sunshine: 10h and 36min).
The month with the least sunshine is January (Average sunshine: 4h and 24min).
Average sunshine days in September
West Salem, IL
- Average sunshine days in September: 19.1 days
The month with the most sunshine days is October (23.2 days).
The months with the least sunshine days are May and June (14.3 days).
Average UV index in September
West Salem, IL
- Average UV index in September: 5
The months with the highest UV index are May, 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
West Salem, IL
- Average cloud cover in September: 29
The month with the most cloud cover is January (Cloud cover 52).
The month with the least cloud cover is June (Cloud cover 27).
Average visibility in September
West Salem, IL
- 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).
West Salem, Illinois, USA
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