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
Otterville, Illinois, starts September with an average high-temperature of a still moderately hot 78.4°F (25.8°C), a minor shift from August's 83.7°F (28.7°C). Otterville anticipates an average minimum temperature of 59.4°F (15.2°C) in the month of September.Humidity
In September, the average relative humidity in Otterville, Illinois, is 75%.Rainfall
In September, the rain falls for 11.5 days. Throughout September, 1.57" (40mm) of precipitation is accumulated. In Otterville, Illinois, during the entire year, the rain falls for 136.5 days and collects up to 23.11" (587mm) of precipitation.Snowfall
In Otterville, snow does not fall in April through October.Daylight
The average length of the day in September is 12h and 26min.On the first day of the month, sunrise is at 6:31 am and sunset at 7:31 pm. On the last day of September, sunrise is at 6:57 am and sunset at 6:45 pm CDT.
Sunshine
The average sunshine in September is 9.5h.UV index
The average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a medium vulnerability from unprotected exposure to Sun's UV rays for the ordinary person.Note: The maximum UV index of 5 during September leads to these instructions:
Exercise care. People with light skin might get burns in fewer than 30 minutes. The best time to avoid the Sun's harmful UV radiation is during midday when it's most potent. A hat with a generous brim can prevent nearly 50% of UV rays from reaching your eyes.
Frequently asked questions
What are the temperatures in Otterville in September?
What is the average humidity in September in Otterville?
How many days does it rain in September in Otterville?
When it does not snow in Otterville?
How many hours of daylight does Otterville have in September?
What time are sunrise and sunset in September in Otterville?
How long on average sun shines in September in Otterville?
How high is the UV index in September in Otterville?
Average temperature in September
Otterville, IL
- Average high temperature in September: 78.4°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 (35.6°F).
- Average low temperature in September: 59.4°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 (22.6°F).
Average pressure in September
Otterville, IL
- Average pressure in September: 30.02"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in September
Otterville, IL
- Average wind speed in September: 6.3mph
The windiest months (with the highest average wind speed) are January and February (9.6mph).
The calmest month (with the lowest average wind speed) is July (5.7mph).
Average humidity in September
Otterville, IL
- Average humidity in September: 75%
The month with the highest relative humidity is July (80%).
The month with the lowest relative humidity is October (71%).
Average rainfall in September
Otterville, IL
- Average rainfall in September: 1.57"
The wettest month (with the highest rainfall) is June (3.07").
The driest month (with the least rainfall) is January (1.06").
Average rainfall days in September
Otterville, IL
- Average rainfall days in September: 11.5 days
The month with the highest number of rainy days is May (16.5 days).
The month with the least rainy days is January (5.9 days).
Average snowfall in September
Otterville, IL
- Average snowfall in September: 0"
The month with the highest snowfall is February (2.17").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in September
Otterville, 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
Otterville, 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 3min
The month with the most sunshine is June (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 4h and 30min).
Average sunshine days in September
Otterville, IL
- Average sunshine days in September: 16.6 days
The month with the most sunshine days is January (20.3 days).
The months with the least sunshine days are May and June (12.3 days).
Average UV index in September
Otterville, 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
Otterville, IL
- Average cloud cover in September: 28
The month with the most cloud cover is January (Cloud cover 51).
The months with the least cloud cover are August and September (Cloud cover 28).
Average visibility in September
Otterville, 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).
Otterville, Illinois, USA
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