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 brings a minor shift in the average high-temperature, adjusting from a moderately hot 85.3°F (29.6°C) in August to a still warm 79.5°F (26.4°C). An average low-temperature of 60.1°F (15.6°C) is anticipated throughout the nights during September.Humidity
The average relative humidity in September is 74%.Rainfall
In Columbia, during September, the rain falls for 12 days and regularly aggregates up to 1.93" (49mm) of precipitation. Throughout the year, in Columbia, there are 141 rainfall days, and 29.29" (744mm) of precipitation is accumulated.Snowfall
In Columbia, Illinois, snow does not fall in April through October.Daylight
In Columbia, the average length of the day in September is 12h and 25min.On the first day of the month, sunrise is at 6:30 am and sunset at 7:30 pm. On the last day of September, sunrise is at 6:56 am and sunset at 6:44 pm CDT.
Sunshine
The average sunshine in September in Columbia, Illinois, is 9.5h.UV index
The average daily maximum UV index in September in Columbia is 5. A UV Index value of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV rays for average individuals.Note: The maximum UV index of 5 during September leads to these instructions:
Act with care - The need to guard against sun damage is communicated. Avoid the Sun's strongest UV rays by seeking shade and limiting exposure during midday. On sunny days, it's ideal to wear sunglasses that filter out UVA and UVB rays.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the average September temperature in Columbia?
What is the average humidity in September in Columbia?
How many days does it rain in September in Columbia?
When it does not snow in Columbia?
How many hours of daylight does Columbia have in September?
When are sunrise and sunset in September in Columbia?
How many hours of sunshine does Columbia have in September?
How high is the UV index in September in Columbia?
Average temperature in September
Columbia, IL
- Average high temperature in September: 79.5°F
The warmest month (with the highest average high temperature) is July (86.9°F).
The month with the lowest average high temperature is January (37.9°F).
- Average low temperature in September: 60.1°F
The month with the highest average low temperature is July (68.9°F).
The coldest month (with the lowest average low temperature) is January (25.2°F).
Average pressure in September
Columbia, IL
- Average pressure in September: 30.02"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in September
Columbia, IL
- Average wind speed in September: 5.9mph
The windiest month (with the highest average wind speed) is January (9.2mph).
The calmest months (with the lowest average wind speed) are July and August (5.5mph).
Average humidity in September
Columbia, IL
- Average humidity in September: 74%
The month with the highest relative humidity is May (79%).
The month with the lowest relative humidity is October (71%).
Average rainfall in September
Columbia, IL
- Average rainfall in September: 1.93"
The wettest month (with the highest rainfall) is May (3.58").
The driest months (with the least rainfall) are February and November (1.57").
Average rainfall days in September
Columbia, IL
- Average rainfall days in September: 12 days
The month with the highest number of rainy days is July (16 days).
The month with the least rainy days is February (6.8 days).
Average snowfall in September
Columbia, IL
- Average snowfall in September: 0"
The month with the highest snowfall is February (2.24").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in September
Columbia, IL
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (6.2 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
Columbia, 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 3min
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 36min).
Average sunshine days in September
Columbia, IL
- Average sunshine days in September: 15.1 days
The month with the most sunshine days is October (20.2 days).
The month with the least sunshine days is June (12.3 days).
Average UV index in September
Columbia, 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 and December (UV index 2).
Average cloud cover in September
Columbia, IL
- Average cloud cover in September: 29
The month with the most cloud cover is January (Cloud cover 50).
The months with the least cloud cover are June, July and August (Cloud cover 28).
Average visibility in September
Columbia, 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).
Columbia, Illinois, USA
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