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
In September, Arrowsmith experiences a minor shift in meteorological conditions with average high-temperatures marked at a still moderately hot 75.9°F (24.4°C), closely mirroring the climate in August. An average low-temperature of 57.9°F (14.4°C) marks the month of September.Humidity
The average relative humidity in September is 76%.Rainfall
In September, in Arrowsmith, the rain falls for 11.6 days. Throughout September, 1.38" (35mm) of precipitation is accumulated. In Arrowsmith, during the entire year, the rain falls for 139 days and collects up to 20.83" (529mm) of precipitation.Snowfall
May through October are months without snowfall.Daylight
In September, the average length of the day in Arrowsmith, Illinois, is 12h and 27min.On the first day of the month, sunrise is at 6:22 am and sunset at 7:26 pm. On the last day of September, in Arrowsmith, sunrise is at 6:50 am and sunset at 6:37 pm CDT.
Sunshine
In Arrowsmith, the average sunshine in September is 9h.UV index
In Arrowsmith, the average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a moderate health risk from exposure to the Sun's UV rays for the average person.Note: The daily high UV index of 5 in September translates into this advice:
Take measures. Individuals with light skin might experience burns in under 30 minutes. For health reasons, it's advisable to reduce direct sun exposure during peak hours around midday. On sunny days, it's ideal to wear sunglasses that filter out UVA and UVB rays.
Frequently asked questions
What are the temperatures in Arrowsmith in September?
What is the average humidity in September in Arrowsmith?
How much does it rain in Arrowsmith in September?
When it does not snow in Arrowsmith?
What is the average length of the day in September in Arrowsmith?
When are sunrise and sunset in September in Arrowsmith?
How long on average sun shines in September in Arrowsmith?
What is the UV index reading in September in Arrowsmith?
Average temperature in September
Arrowsmith, IL
- Average high temperature in September: 75.9°F
The warmest month (with the highest average high temperature) is July (80.8°F).
The month with the lowest average high temperature is January (31.3°F).
- Average low temperature in September: 57.9°F
The month with the highest average low temperature is July (64.9°F).
The coldest month (with the lowest average low temperature) is January (19.6°F).
Average pressure in September
Arrowsmith, IL
- Average pressure in September: 30.03"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in September
Arrowsmith, IL
- Average wind speed in September: 7.6mph
The windiest month (with the highest average wind speed) is January (11mph).
The calmest month (with the lowest average wind speed) is August (6.5mph).
Average humidity in September
Arrowsmith, IL
- Average humidity in September: 76%
The month with the highest relative humidity is July (85%).
The month with the lowest relative humidity is October (71%).
Average rainfall in September
Arrowsmith, IL
- Average rainfall in September: 1.38"
The wettest month (with the highest rainfall) is May (2.87").
The driest month (with the least rainfall) is December (1.1").
Average rainfall days in September
Arrowsmith, IL
- Average rainfall days in September: 11.6 days
The month with the highest number of rainy days is May (17.5 days).
The month with the least rainy days is January (5.8 days).
Average snowfall in September
Arrowsmith, IL
- Average snowfall in September: 0"
The month with the highest snowfall is January (2.8").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Arrowsmith, IL
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (9.8 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
Arrowsmith, IL
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in September: 9h and 0min
The month with the most sunshine is June (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 3h and 54min).
Average sunshine days in September
Arrowsmith, IL
- Average sunshine days in September: 16.5 days
The month with the most sunshine days is November (19.6 days).
The month with the least sunshine days is June (10.3 days).
Average UV index in September
Arrowsmith, IL
- Average UV index in September: 5
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in September
Arrowsmith, IL
- Average cloud cover in September: 31
The month with the most cloud cover is January (Cloud cover 58).
The month with the least cloud cover is September (Cloud cover 31).
Average visibility in September
Arrowsmith, IL
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are July and August (5mi).
Arrowsmith, Illinois, USA
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