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 shift into September finds Salem at an average high-temperature of a still moderately hot 78.3°F (25.7°C), closely comparable to August's conditions. Throughout September, an average nighttime temperature of 59.7°F (15.4°C) is experienced.Humidity
In September, the average relative humidity is 75%.Rainfall
In Salem, in September, during 9.4 rainfall days, 0.83" (21mm) of precipitation is typically accumulated. In Salem, during the entire year, the rain falls for 123.2 days and collects up to 15.08" (383mm) of precipitation.Snowfall
May through October are months without snowfall.Daylight
In Salem, the average length of the day in September is 12h and 25min.On the first day of September, sunrise is at 6:25 am and sunset at 7:25 pm. On the last day of the month, sunrise is at 6:51 am and sunset at 6:39 pm CDT.
Sunshine
In Salem, the average sunshine in September is 9.2h.UV index
In Salem, the average daily maximum UV index in September is 5. 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 maximum daily UV index of 5 during September translates into the following directions:
Take precautions - Protection against skin and eye damage is obliged. The Sun's radiation is especially intense around midday; try to stay in shade during this period. For excellent sun protection for the eyes, ears, face, and neck, consider a wide-brim hat.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the temperature in September?
What is the average humidity in September?
How much does it rain in September?
When it does not snow?
How many hours of daylight does Salem have in September?
When is the sunrise / sunset in September?
How long on average sun shines in September?
What is the UV index reading in September?
Average temperature in September
Salem, IL
- Average high temperature in September: 78.3°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 (37°F).
- Average low temperature in September: 59.7°F
The month with the highest average low temperature is July (67.5°F).
The coldest month (with the lowest average low temperature) is January (24.3°F).
Average pressure in September
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 (29.93"Hg).
Average wind speed in September
Salem, IL
- Average wind speed in September: 6.5mph
The windiest month (with the highest average wind speed) is January (10.2mph).
The calmest month (with the lowest average wind speed) is July (5.9mph).
Average humidity in September
Salem, IL
- Average humidity in September: 75%
The months with the highest relative humidity are May, July and August (80%).
The month with the lowest relative humidity is October (71%).
Average rainfall in September
Salem, IL
- Average rainfall in September: 0.83"
The wettest month (with the highest rainfall) is April (2.01").
The driest month (with the least rainfall) is February (0.71").
Average rainfall days in September
Salem, IL
- Average rainfall days in September: 9.4 days
The month with the highest number of rainy days is May (14.8 days).
The month with the least rainy days is January (6.6 days).
Average snowfall in September
Salem, IL
- Average snowfall in September: 0"
The month with the highest snowfall is January (0.63").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Salem, IL
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (5.1 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
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 months with the most sunshine are June and July (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 4h and 24min).
Average sunshine days in September
Salem, IL
- Average sunshine days in September: 18.4 days
The month with the most sunshine days is October (20.8 days).
The month with the least sunshine days is May (12.8 days).
Average UV index in September
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
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 28).
Average visibility in September
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).
Salem, Illinois, USA
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