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 beginning of September reveals an average high-temperature of a still warm 77.9°F (25.5°C), showing minimal deviation from the previous month. Throughout September, Vandalia's nights cool down to an average of 59.4°F (15.2°C).Humidity
The average relative humidity in September in Vandalia is 75%.Rainfall
In Vandalia, during September, the rain falls for 13.3 days and regularly aggregates up to 2.17" (55mm) of precipitation. Throughout the year, there are 164.1 rainfall days, and 36.73" (933mm) of precipitation is accumulated.Snowfall
In Vandalia, snow does not fall in May through October.Daylight
In September, the average length of the day in Vandalia is 12h and 26min.On the first day of the month, sunrise is at 6:25 am and sunset at 7:26 pm. On the last day of September, sunrise is at 6:52 am and sunset at 6:40 pm CDT.
Sunshine
The average sunshine in September in Vandalia is 9.1h.UV index
In September, the average daily maximum UV index in Vandalia, Illinois, is 5. A UV Index estimate of 3 to 5 represents a medium health hazard from unprotected exposure to Sun's UV rays for average individuals.Note: The UV index of 5 during September translates into the following guidance:
Prioritize safety - Recommendations to avert sunburn are shared. It's crucial to reduce time in the direct Sun around mid-day due to the intense solar radiation. Clothes that are both tight-knit and comfortably loose are prime choices for sun protection.
Frequently asked questions
What is the average September temperature in Vandalia?
What is the average humidity in September in Vandalia?
How many days does it rain in September in Vandalia?
When it does not snow in Vandalia?
How many hours of daylight does Vandalia have in September?
What time are sunrise and sunset in September in Vandalia?
How long on average sun shines in September in Vandalia?
What is the UV index intensity in September in Vandalia?
Average temperature in September
Vandalia, IL
- Average high temperature in September: 77.9°F
The warmest month (with the highest average high temperature) is July (84°F).
The month with the lowest average high temperature is January (36°F).
- Average low temperature in September: 59.4°F
The month with the highest average low temperature is July (67.3°F).
The coldest month (with the lowest average low temperature) is January (23.4°F).
Average pressure in September
Vandalia, 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
Vandalia, IL
- Average wind speed in September: 6.6mph
The windiest month (with the highest average wind speed) is January (10.3mph).
The calmest months (with the lowest average wind speed) are July and August (6mph).
Average humidity in September
Vandalia, IL
- Average humidity in September: 75%
The month with the highest relative humidity is July (81%).
The month with the lowest relative humidity is October (71%).
Average rainfall in September
Vandalia, IL
- Average rainfall in September: 2.17"
The wettest month (with the highest rainfall) is June (4.57").
The driest month (with the least rainfall) is February (2.01").
Average rainfall days in September
Vandalia, IL
- Average rainfall days in September: 13.3 days
The month with the highest number of rainy days is May (18.3 days).
The month with the least rainy days is January (9.2 days).
Average snowfall in September
Vandalia, IL
- Average snowfall in September: 0"
The month with the highest snowfall is December (2.4").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Vandalia, IL
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (8.3 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
Vandalia, IL
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 54min).
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 18min).
The month with the least sunshine is January (Average sunshine: 4h and 18min).
Average sunshine days in September
Vandalia, IL
- Average sunshine days in September: 14.7 days
The month with the most sunshine days is October (17.2 days).
The month with the least sunshine days is July (8.6 days).
Average UV index in September
Vandalia, IL
- Average UV index in September: 5
The months with the highest UV index are 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
Vandalia, IL
- Average cloud cover in September: 30
The month with the most cloud cover is January (Cloud cover 53).
The months with the least cloud cover are June, July and September (Cloud cover 30).
Average visibility in September
Vandalia, 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).
Vandalia, Illinois, USA
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