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
Hillsdale registers an average high-temperature of a still moderately hot 74.7°F (23.7°C) at the commencement of September, closely related to the preceding month. Throughout September, Hillsdale registers a consistent average low-temperature of 55.9°F (13.3°C).Humidity
In September, the average relative humidity in Hillsdale is 77%.Rainfall
In Hillsdale, during September, the rain falls for 11.3 days and regularly aggregates up to 2.09" (53mm) of precipitation. In Hillsdale, during the entire year, the rain falls for 145.7 days and collects up to 27.91" (709mm) of precipitation.Snowfall
In Hillsdale, snow does not fall in May through September.Daylight
The average length of the day in September is 12h and 28min.On the first day of the month, sunrise is at 6:27 am and sunset at 7:33 pm. On the last day of September, sunrise is at 6:57 am and sunset at 6:43 pm CDT.
Sunshine
In Hillsdale, the average sunshine in September is 9.2h.UV index
In Hillsdale, the average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a moderate health risk from unprotected exposure to Sun's UV rays for the ordinary person.Note: In September, the UV index of 4 transforms into the following advice:
Ensure safety - Sun damage prevention is strongly urged. The Sun's harshest UV rays are around midday; it's wise to seek shade and limit time outdoors. Clothes that are both tight-knit and comfortably loose are prime choices for sun protection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for Hillsdale in September?
What is the average humidity in September?
How much does it rain in September?
When it does not snow?
Does it snow in Hillsdale in September?
How many hours of daylight does Hillsdale have in September?
When are sunrise and sunset in September?
How many hours of sunshine does Hillsdale have in September?
What is the UV index intensity in September?
Average temperature in September
Hillsdale, IL
- Average high temperature in September: 74.7°F
The warmest month (with the highest average high temperature) is July (80.2°F).
The month with the lowest average high temperature is January (27.9°F).
- Average low temperature in September: 55.9°F
The month with the highest average low temperature is July (64°F).
The coldest month (with the lowest average low temperature) is January (14.9°F).
Average pressure in September
Hillsdale, IL
- Average pressure in September: 30.03"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in September
Hillsdale, IL
- Average wind speed in September: 7.7mph
The windiest month (with the highest average wind speed) is April (10.4mph).
The calmest month (with the lowest average wind speed) is August (6.5mph).
Average humidity in September
Hillsdale, IL
- Average humidity in September: 77%
The month with the highest relative humidity is January (85%).
The month with the lowest relative humidity is October (72%).
Average rainfall in September
Hillsdale, IL
- Average rainfall in September: 2.09"
The wettest month (with the highest rainfall) is May (4.41").
The driest month (with the least rainfall) is January (1.34").
Average rainfall days in September
Hillsdale, IL
- Average rainfall days in September: 11.3 days
The month with the highest number of rainy days is May (18.1 days).
The month with the least rainy days is February (5.3 days).
Average snowfall in September
Hillsdale, IL
- Average snowfall in September: 0"
The month with the highest snowfall is January (4.21").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
Hillsdale, IL
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (11.3 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
Hillsdale, IL
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in September: 9h and 1min
The month with the most sunshine is July (Average sunshine: 9h and 54min).
The month with the least sunshine is January (Average sunshine: 3h and 54min).
Average sunshine days in September
Hillsdale, IL
- Average sunshine days in September: 17.1 days
The month with the most sunshine days is November (17.8 days).
The month with the least sunshine days is June (10.8 days).
Average UV index in September
Hillsdale, IL
- Average UV index in September: 4
The months with the highest UV index are July and August (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in September
Hillsdale, IL
- Average cloud cover in September: 30
The month with the most cloud cover is January (Cloud cover 59).
The month with the least cloud cover is September (Cloud cover 30).
Average visibility in September
Hillsdale, IL
- Average visibility in September: 6mi
The months with the highest visibility are February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are January, July and August (5mi).
Hillsdale, Illinois, USA
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