September weather forecast
Berlin, IL

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Weather in September

The first month of the autumn, September, is still a warm month in Berlin, Illinois, with an average temperature ranging between min 58.8°F (14.9°C) and max 77.5°F (25.3°C).

Temperature

In the transition from August to September, Berlin reports an average high-temperature of a still moderately hot 77.5°F (25.3°C), indicating a close resemblance to the prior month. An average nighttime temperature of 58.8°F (14.9°C) is recorded in Berlin during September.

Humidity

In Berlin, the average relative humidity in September is 75%.

Rainfall

In Berlin, during September, the rain falls for 10.9 days and regularly aggregates up to 1.77" (45mm) of precipitation. In Berlin, Illinois, during the entire year, the rain falls for 126.6 days and collects up to 17.95" (456mm) of precipitation.

Snowfall

May through October are months without snowfall.

Daylight

The average length of the day in September is 12h and 26min.
On the first day of the month, sunrise is at 6:28 am and sunset at 7:30 pm. On the last day of September, sunrise is at 6:55 am and sunset at 6:43 pm CDT.

Sunshine

The average sunshine in September is 9.3h.

UV index

The average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV rays for average individuals.
Note: A maximum high UV index of 5 in September translates into the following recommendations:
Be mindful. Those with pale skin might receive burns in fewer than 30 minutes. When the Sun's UV radiation is most intense during midday, it's best to find shade and limit exposure. For minimizing sun-related eye damage, always choose sunglasses with UVA and UVB coverage.
Updated: Aug 16, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the usual temperature for Berlin in September?

In Berlin, in September, the average high-temperature is 77.5°F (25.3°C), and the average low-temperature is 58.8°F (14.9°C). The average heat index (a.k.a. 'feels like', 'real feel'), which takes the relative humidity and factors it into the air temperature reading, in August is computed to be 89.6°F (32°C).

What is the average humidity in September?

The average relative humidity in September is 75%.

How much does it rain in September?

In September, the rain falls for 10.9 days. Throughout September, 1.77" (45mm) of precipitation is accumulated.

When it does not snow?

In Berlin, snow does not fall in May through October.

What is the average length of the day in September?

In Berlin, the average day length in September is 12h and 26min.

When are sunrise and sunset in September?

In September, on the first day of the month, sunrise is at 6:28 am and sunset at 7:30 pm. On the last day of the month, sunrise is at 6:55 am and sunset at 6:43 pm CDT.

How long on average sun shines in September?

In September, the average sunshine duration is 9.3h.

How high is the UV index in September?

The average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a medium health risk from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Berlin, IL

Average temperature in September - Berlin, IL
  • Average high temperature in September: 77.5°F

The warmest month (with the highest average high temperature) is July (83.1°F).
The month with the lowest average high temperature is January (33.6°F).

  • Average low temperature in September: 58.8°F

The month with the highest average low temperature is July (66.7°F).
The coldest month (with the lowest average low temperature) is January (21.4°F).

Average pressure in September
Berlin, IL

Average pressure in September - Berlin, 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 (29.91"Hg).

Average wind speed in September
Berlin, IL

Average wind speed in September - Berlin, IL
  • Average wind speed in September: 7mph

The windiest month (with the highest average wind speed) is January (10.3mph).
The calmest month (with the lowest average wind speed) is July (6.1mph).

Average humidity in September
Berlin, IL

Average humidity in September - Berlin, IL
  • Average humidity in September: 75%

The month with the highest relative humidity is July (83%).
The month with the lowest relative humidity is October (71%).

Average rainfall in September
Berlin, IL

Average rainfall in September - Berlin, IL
  • Average rainfall in September: 1.77"

The wettest month (with the highest rainfall) is June (2.36").
The driest months (with the least rainfall) are February and December (0.79").

Average rainfall days in September
Berlin, IL

Average rainfall days in September - Berlin, IL
  • Average rainfall days in September: 10.9 days

The month with the highest number of rainy days is May (15.4 days).
The month with the least rainy days is January (5.2 days).

Average snowfall in September
Berlin, IL

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

The month with the highest snowfall is January (1.57").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in September
Berlin, IL

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

The month with the highest number of snowfall days is January (7.6 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
Berlin, IL

Average daylight in September / Average sunshine in September - Berlin, 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 24min).

  • Average sunshine in September: 9h and 2min

The month with the most sunshine is June (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 4h and 12min).

Average sunshine days in September
Berlin, IL

Average sunshine days in September - Berlin, IL
  • Average sunshine days in September: 17.4 days

The month with the most sunshine days is November (20.9 days).
The month with the least sunshine days is July (12.9 days).

Average UV index in September
Berlin, IL

Average UV index in September - Berlin, 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
Berlin, IL

Average cloud cover in September - Berlin, IL
  • Average cloud cover in September: 30

The month with the most cloud cover is January (Cloud cover 55).
The months with the least cloud cover are August and September (Cloud cover 30).

Average visibility in September
Berlin, IL

Average visibility in September - Berlin, 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).

Berlin, Illinois, USA

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