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 arrival of September, Richmond notices a mild change in the average high-temperature, sliding from August's moderately hot 77.5°F (25.3°C) to a pleasant 71.8°F (22.1°C). In September, Richmond records an average nighttime temperature of 52.7°F (11.5°C).Humidity
In Richmond, the average relative humidity in September is 81%.Rainfall
In September, in Richmond, the rain falls for 11.5 days. Throughout September, 1.46" (37mm) of precipitation is accumulated. In Richmond, during the entire year, the rain falls for 133.6 days and collects up to 20.16" (512mm) of precipitation.Snowfall
June through September are months without snowfall.Daylight
The average length of the day in September is 12h and 28min.On the first day of the month, sunrise is at 6:19 am and sunset at 7:26 pm. On the last day of September, sunrise is at 6:50 am and sunset at 6:35 pm CDT.
Sunshine
In Richmond, the average sunshine in September is 8.6h.UV index
In September, the average daily maximum UV index in Richmond is 4. A UV Index reading of 3 to 5 represents a moderate health risk from unsafe exposure to UV radiation for the average person.Note: The daily high UV index of 4 during September translates into the following recommendations:
Prioritize safety - Recommendations to avert sunburn are shared. The Sun's harshest UV rays are around midday; it's wise to seek shade and limit time outdoors. For minimizing sun-related eye damage, always choose sunglasses with UVA and UVB coverage.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are September temperatures in Richmond?
What is the average humidity in September in Richmond?
How many days does it rain in September in Richmond?
When it does not snow in Richmond?
Does it snow in Richmond in September?
How many hours of daylight does Richmond have in September?
When is the sunrise / sunset in September in Richmond?
How long on average sun shines in September in Richmond?
What is the UV index reading in September in Richmond?
Average temperature in September
Richmond, IL
- Average high temperature in September: 71.8°F
The warmest month (with the highest average high temperature) is July (79.3°F).
The month with the lowest average high temperature is January (24.4°F).
- Average low temperature in September: 52.7°F
The month with the highest average low temperature is July (61.9°F).
The coldest month (with the lowest average low temperature) is January (12.2°F).
Average pressure in September
Richmond, IL
- Average pressure in September: 30.03"Hg
The month with the highest atmospheric pressure is January (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in September
Richmond, IL
- Average wind speed in September: 7.2mph
The windiest month (with the highest average wind speed) is April (9.9mph).
The calmest month (with the lowest average wind speed) is August (6.3mph).
Average humidity in September
Richmond, IL
- Average humidity in September: 81%
The month with the highest relative humidity is January (88%).
The month with the lowest relative humidity is April (76%).
Average rainfall in September
Richmond, IL
- Average rainfall in September: 1.46"
The wettest month (with the highest rainfall) is June (2.87").
The driest months (with the least rainfall) are January, February and December (0.83").
Average rainfall days in September
Richmond, IL
- Average rainfall days in September: 11.5 days
The month with the highest number of rainy days is May (17.2 days).
The month with the least rainy days is February (3.8 days).
Average snowfall in September
Richmond, IL
- Average snowfall in September: 0"
The month with the highest snowfall is January (3.23").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Richmond, IL
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (12.6 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Richmond, IL
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 6min).
- Average sunshine in September: 8h and 4min
The month with the most sunshine is July (Average sunshine: 9h and 48min).
The month with the least sunshine is January (Average sunshine: 3h and 30min).
Average sunshine days in September
Richmond, IL
- Average sunshine days in September: 15.6 days
The month with the most sunshine days is November (18.6 days).
The month with the least sunshine days is June (10.3 days).
Average UV index in September
Richmond, IL
- Average UV index in September: 4
The month with the highest UV index is June (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in September
Richmond, IL
- Average cloud cover in September: 34
The month with the most cloud cover is January (Cloud cover 64).
The months with the least cloud cover are August and September (Cloud cover 34).
Average visibility in September
Richmond, IL
- Average visibility in September: 5mi
The months with the highest visibility are March, April, May, June, October, November and December (6mi).
The months with the lowest visibility are January, February, July, August and September (5mi).
Richmond, Illinois, USA
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