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
Hillsboro's September showcases an average high-temperature of a still moderately hot 77.7°F (25.4°C), hardly distinct from August's 82.6°F (28.1°C). Hillsboro observes an average nighttime low-temperature of 59.2°F (15.1°C) during the month of September.Humidity
In Hillsboro, the average relative humidity in September is 75%.Rainfall
In Hillsboro, in September, it is raining for 11.4 days, with typically 1.57" (40mm) of accumulated precipitation. Throughout the year, in Hillsboro, there are 138.5 rainfall days, and 24.33" (618mm) of precipitation is accumulated.Snowfall
April through October are months without snowfall.Daylight
In Hillsboro, the average length of the day in September is 12h and 26min.On the first day of September in Hillsboro, sunrise is at 6:27 am and sunset at 7:28 pm. On the last day of the month, sunrise is at 6:53 am and sunset at 6:41 pm CDT.
Sunshine
In September, the average sunshine in Hillsboro is 9.3h.UV index
In September, the average daily maximum UV index is 5. A UV Index estimate of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV rays for ordinary individuals.Note: The maximum daily UV index of 5 during September translates into the following directions:
Put precautions into practice - Guidance to elude sunburn is provided. Avoiding the Sun's peak radiation during midday hours is essential for health and safety. Wearing a wide-brim hat can block approximately 50% of UV radiation, protecting the eyes.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in Hillsboro in September?
What is the average humidity in September in Hillsboro?
How much does it rain in Hillsboro in September?
When it does not snow in Hillsboro?
What is the average length of the day in September in Hillsboro?
When are sunrise and sunset in September in Hillsboro?
How long on average sun shines in September in Hillsboro?
How high is the UV index in September in Hillsboro?
Average temperature in September
Hillsboro, IL
- Average high temperature in September: 77.7°F
The warmest month (with the highest average high temperature) is July (83.8°F).
The month with the lowest average high temperature is January (35.4°F).
- Average low temperature in September: 59.2°F
The month with the highest average low temperature is July (67.1°F).
The coldest month (with the lowest average low temperature) is January (22.6°F).
Average pressure in September
Hillsboro, 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 (29.92"Hg).
Average wind speed in September
Hillsboro, IL
- Average wind speed in September: 6.6mph
The windiest month (with the highest average wind speed) is January (10.3mph).
The calmest month (with the lowest average wind speed) is July (5.9mph).
Average humidity in September
Hillsboro, IL
- Average humidity in September: 75%
The month with the highest relative humidity is July (82%).
The month with the lowest relative humidity is October (71%).
Average rainfall in September
Hillsboro, IL
- Average rainfall in September: 1.57"
The wettest month (with the highest rainfall) is June (3.35").
The driest month (with the least rainfall) is February (1.34").
Average rainfall days in September
Hillsboro, IL
- Average rainfall days in September: 11.4 days
The month with the highest number of rainy days is May (16.8 days).
The month with the least rainy days is January (7 days).
Average snowfall in September
Hillsboro, IL
- Average snowfall in September: 0"
The month with the highest snowfall is February (1.81").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in September
Hillsboro, 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
Hillsboro, 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 2min
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 18min).
Average sunshine days in September
Hillsboro, IL
- Average sunshine days in September: 15.7 days
The month with the most sunshine days is October (19.8 days).
The month with the least sunshine days is May (11.8 days).
Average UV index in September
Hillsboro, 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
Hillsboro, IL
- Average cloud cover in September: 29
The month with the most cloud cover is January (Cloud cover 53).
The months with the least cloud cover are June and September (Cloud cover 29).
Average visibility in September
Hillsboro, IL
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, September, October, November and December (6mi).
The month with the lowest visibility is August (5mi).
Hillsboro, Illinois, USA
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