September weather forecast
Hebron, IL

Weather in September

The first month of the autumn, September, is also an agreeable month in Hebron, Illinois, with average temperature fluctuating between 52.7°F (11.5°C) and 71.8°F (22.1°C).

Temperature

In September, the average high-temperature marginally drops, from a moderately hot 77.5°F (25.3°C) in August, to an agreeable 71.8°F (22.1°C). In Hebron, the average low-temperature is 52.7°F (11.5°C).

Humidity

The average relative humidity in Hebron, Illinois, is 81%.

Rainfall

In September, the rain falls for 10.5 days. Throughout September, 1.02" (26mm) of precipitation is accumulated. In Hebron, during the entire year, the rain falls for 121.6 days and collects up to 14.06" (357mm) of precipitation.

Snowfall

June through September are months without snowfall.

Daylight

In September, the average length of the day is 12.5h.

Sunshine

In September, the average sunshine in Hebron is 8.5h.

UV index

The average daily maximum UV index in Hebron, Illinois, is 4. A UV Index of 3 to 5 symbolizes a moderate threat to health from unsafe exposure to the UV radiation for average individuals.
Note: The average daily UV index of 4 in September transform into the following instructions:
Take precautions - Protection against the skin and eye damage is obliged. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
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FAQ

What is the average humidity in September in Hebron?

The average relative humidity in September in Hebron, Illinois, is 81%.

How much does it rain in Hebron in September?

In Hebron, Illinois, in September, during 10.5 rainfall days, 1.02" (26mm) of precipitation is typically accumulated.

When it does not snow in Hebron?

June through September are months without snowfall in Hebron.

Does it snow in Hebron in September?

In Hebron, in September, it doesn't snow. In October, it regularly snows.

What is the average length of the day in September in Hebron?

In Hebron, the average length of the day in September is 12.5h.

How many hours of sunshine does Hebron have in September?

The average sunshine in September is 8.5h.

What is the UV index reading in September in Hebron?

In Hebron, Illinois, the average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a medium hazard to health from unprotected exposure to the UV radiation.

Average temperature in September
Hebron, IL

Average temperature in September - Hebron, IL
  • Average high temperature in September: 71.8°F

The warmest month (with the highest average high temperature) is July (79.3°F).
The month with the lowest average high temperature is January (24.3°F).

  • Average low temperature in September: 52.7°F

The month with the highest average low temperature is July (61.5°F).
The coldest month (with the lowest average low temperature) is January (12.2°F).

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Average pressure in September
Hebron, IL

Average pressure in September - Hebron, IL
  • Average pressure in September: 30.03"

Months with the highest atmospheric pressure are January and February (30.1").
The month with the lowest atmospheric pressure is June (29.91").

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Average wind speed in September
Hebron, IL

Average wind speed in September - Hebron, IL
  • Average wind speed in September: 7.2mph

The windiest month (with the highest average wind speed) is April (9.9mph).
The calmest month (with the lowest average wind speed) is August (6.3mph).

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Average humidity in September
Hebron, IL

Average humidity in September - Hebron, IL
  • Average humidity in September: 81%

The month with the highest relative humidity is January (88%).
The month with the lowest relative humidity is April (76%).

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Average rainfall in September
Hebron, IL

Average rainfall in September - Hebron, IL
  • Average rainfall in September: 1.02"

The wettest month (with the highest rainfall) is July (1.93").
The driest month (with the least rainfall) is December (0.55").

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Average rainfall days in September
Hebron, IL

Average rainfall days in September - Hebron, IL
  • Average rainfall days in September: 10.5 days

Months with the highest number of rainy days are May and July (15.7 days).
The month with the least rainy days is January (2.8 days).

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Average snowfall in September
Hebron, IL

Average snowfall in September - Hebron, IL
  • Average snowfall in September: 0"

The month with the highest snowfall is January (2.13").
Months with the least snowfall are June, July, August and September (0").

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Average snowfall days in September
Hebron, IL

Average snowfall days in September - Hebron, IL
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (12.8 days).
Months with the least snowfall days are June, July, August and September (0 days).

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Average daylight in September /
Average sunshine in September
Hebron, IL

Average daylight in September / Average sunshine in September - Hebron, IL
  • Average daylight in September: 12.5h

The month with the longest days is June (Average daylight: 15.3h).
The month with the shortest days is December (Average daylight: 9.1h).

  • Average sunshine in September: 8.5h

Months with the most sunshine are July and August (Average sunshine: 9.7h).
The month with the least sunshine is January (Average sunshine: 3.4h).

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Average sunshine days in September
Hebron, IL

Average sunshine days in September - Hebron, IL
  • Average sunshine days in September: 16.8 days

The month with the most sunshine days is November (18.7 days).
The month with the least sunshine days is July (11.6 days).

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Average UV index in September
Hebron, IL

Average UV index in September - Hebron, IL
  • Average UV index in September: 4

Months with the highest UV index are May, June, July and August (UV index 5).
Months with the lowest UV index are January, November and December (UV index 1).

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Average cloud cover in September
Hebron, IL

Average cloud cover in September - Hebron, IL
  • Average cloud cover in September: 35

The month with the most cloud cover is January (Cloud cover 65).
The month with the least cloud cover is August (Cloud cover 34).

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Average visibility in September
Hebron, IL

Average visibility in September - Hebron, IL
  • Average visibility in September: 5mi

Months with the highest visibility are March, April, May, June, October, November and December (6mi).
Months with the lowest visibility are January, February, July, August and September (5mi).

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