September weather forecast
Tolono, IL

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Weather in September

The first month of the autumn, September, is still a warm month in Tolono, Illinois, with an average temperature fluctuating between 58.3°F (14.6°C) and 76.5°F (24.7°C).

Temperature

A minor adjustment in Tolono's average high-temperature is noted with the start of September, touching a still moderately hot 76.5°F (24.7°C) from August's 81.1°F (27.3°C). During September, Tolono's temperature averages to a moderate 58.3°F (14.6°C) at night.

Humidity

In Tolono, Illinois, the average relative humidity in September is 76%.

Rainfall

September is the month with the least rainfall. Rain falls for 11.5 days and accumulates 1.18" (30mm) of precipitation.

Snowfall

In Tolono, Illinois, snow does not fall in May through October.

Daylight

In Tolono, Illinois, the average length of the day in September is 12h and 26min.
On the first day of September, sunrise is at 6:21 am and sunset at 7:24 pm. On the last day of the month, sunrise is at 6:49 am and sunset at 6:36 pm CDT.

Sunshine

The average sunshine in September in Tolono is 8.9h.

UV index

The average daily maximum UV index in September in Tolono is 5. A UV Index of 3 to 5 symbolizes a moderate threat to health from unsafe exposure to UV radiation for the ordinary person.
Note: The maximum UV index of 5 during September leads to these instructions:
Be mindful. Individuals with a lighter skin tone may suffer burns in less than 30 minutes. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. On sunny days, it's ideal to wear sunglasses that filter out UVA and UVB rays.
Updated: Feb 12, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What are the temperatures in Tolono in September?

The high-temperature in Tolono, Illinois, during September is 76.5°F (24.7°C) and the low-temperature is 58.3°F (14.6°C). In August, the average heat index (a.k.a. 'felt air temperature', 'feels like'), which represents the influence of relative humidity on air temperature, is appraised at 87.8°F (31°C).

What is the average humidity in September in Tolono?

In September, the average relative humidity is 76%.

What is the driest month in Tolono?

The month with the least rainfall in Tolono, Illinois, is September, when the rain falls for 11.5 days and typically collects 1.18" (30mm) of precipitation.

How much does it rain in Tolono in September?

In Tolono, in September, it is raining for 11.5 days, with typically 1.18" (30mm) of accumulated precipitation.

When it does not snow in Tolono?

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

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

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

When is the sunrise / sunset in September in Tolono?

On the first day of September in Tolono, Illinois, sunrise is at 6:21 am and sunset at 7:24 pm. On the last day of the month, sunrise is at 6:49 am and sunset at 6:36 pm CDT.

How long on average sun shines in September in Tolono?

In Tolono, Illinois, the average sunshine duration in September is 8.9h.

What is the UV index intensity in September in Tolono?

The average daily maximum UV index in September in Tolono is 5. A UV Index value of 3 to 5 symbolizes a medium hazard to health from unprotected exposure to UV radiation.
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
Tolono, IL

Average temperature in September - Tolono, IL
  • Average high temperature in September: 76.5°F

The warmest month (with the highest average high temperature) is July (81.7°F).
The month with the lowest average high temperature is January (32.2°F).

  • Average low temperature in September: 58.3°F

The month with the highest average low temperature is July (65.1°F).
The coldest month (with the lowest average low temperature) is January (20.7°F).

Average pressure in September
Tolono, IL

Average pressure in September - Tolono, 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
Tolono, IL

Average wind speed in September - Tolono, IL
  • Average wind speed in September: 7.3mph

The windiest month (with the highest average wind speed) is January (10.9mph).
The calmest months (with the lowest average wind speed) are July and August (6.4mph).

Average humidity in September
Tolono, IL

Average humidity in September - Tolono, 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 (70%).

Average rainfall in September
Tolono, IL

Average rainfall in September - Tolono, IL
  • Average rainfall in September: 1.18"

The wettest month (with the highest rainfall) is May (2.8").
The driest month (with the least rainfall) is September (1.18").

Average rainfall days in September
Tolono, IL

Average rainfall days in September - Tolono, IL
  • Average rainfall days in September: 11.5 days

The months with the highest number of rainy days are May and July (16.8 days).
The month with the least rainy days is February (6.2 days).

Average snowfall in September
Tolono, IL

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

The month with the highest snowfall is February (2.56").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in September
Tolono, IL

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

The month with the highest number of snowfall days is January (9.4 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
Tolono, IL

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

  • Average sunshine in September: 8h and 5min

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
Tolono, IL

Average sunshine days in September - Tolono, IL
  • Average sunshine days in September: 16.1 days

The month with the most sunshine days is November (18.2 days).
The month with the least sunshine days is July (10.8 days).

Average UV index in September
Tolono, IL

Average UV index in September - Tolono, 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
Tolono, IL

Average cloud cover in September - Tolono, IL
  • Average cloud cover in September: 32

The month with the most cloud cover is January (Cloud cover 58).
The months with the least cloud cover are June, August and September (Cloud cover 32).

Average visibility in September
Tolono, IL

Average visibility in September - Tolono, 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).

Tolono, Illinois, USA

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