September weather forecast
Tonica, IL

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Weather in September

September, the first month of the autumn in Tonica, is still a warm month, with an average temperature ranging between max 74.5°F (23.6°C) and min 56.1°F (13.4°C).

Temperature

The arrival of September sees an average high-temperature of a still warm 74.5°F (23.6°C), hardly diverging from August's 79.5°F (26.4°C). In Tonica, September's nights observe an average temperature dip to a moderate 56.1°F (13.4°C).

Humidity

In September, the average relative humidity is 78%.

Rainfall

In September, the rain falls for 11.5 days. Throughout September, 2.28" (58mm) of precipitation is accumulated. In Tonica, Illinois, during the entire year, the rain falls for 151.4 days and collects up to 30.67" (779mm) of precipitation.

Snowfall

May through September are months without snowfall in Tonica.

Daylight

The average length of the day in September is 12h and 28min.
On the first day of September in Tonica, sunrise is at 6:23 am and sunset at 7:28 pm. On the last day of the month, sunrise is at 6:52 am and sunset at 6:39 pm CDT.

Sunshine

In September, the average sunshine in Tonica is 8.8h.

UV index

In September, the average daily maximum UV index in Tonica is 4. A UV Index of 3 to 5 symbolizes a moderate threat to health from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: The maximum UV index of 4 during September leads to these instructions:
Take care. Persons with lighter skin might suffer burns in less than 30 minutes. During midday, the Sun's radiation is strongest, and it's advisable to reduce direct exposure. For minimizing sun-related eye damage, always choose sunglasses with UVA and UVB coverage.
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Frequently asked questions

What are the temperatures in Tonica in September?

September temperatures in Tonica, Illinois, vary between a high-temperature of 74.5°F (23.6°C) and a low-temperature of 56.1°F (13.4°C). In July, the average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which represents the influence of relative humidity on air temperature, is appraised at 86°F (30°C).

What is the average humidity in September in Tonica?

In September, the average relative humidity is 78%.

How much does it rain in Tonica in September?

In Tonica, in September, during 11.5 rainfall days, 2.28" (58mm) of precipitation is typically accumulated.

When it does not snow in Tonica?

May through September are months without snowfall in Tonica.

Does it snow in Tonica in September?

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

How many hours of daylight does Tonica have in September?

In Tonica, Illinois, the average day length in September is 12h and 28min.

When are sunrise and sunset in September in Tonica?

On the first day of September, sunrise is at 6:23 am and sunset at 7:28 pm. On the last day of the month, sunrise is at 6:52 am and sunset at 6:39 pm CDT.

How many hours of sunshine does Tonica have in September?

In Tonica, Illinois, the average sunshine duration in September is 8.8h.

What is the UV index intensity in September in Tonica?

The average daily maximum UV index in September in Tonica is 4. A UV Index value of 3 to 5 symbolizes a moderate health threat 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
Tonica, IL

Average temperature in September - Tonica, IL
  • Average high temperature in September: 74.5°F

The warmest month (with the highest average high temperature) is July (80.6°F).
The month with the lowest average high temperature is January (28.9°F).

  • Average low temperature in September: 56.1°F

The month with the highest average low temperature is July (64.2°F).
The coldest month (with the lowest average low temperature) is January (16.9°F).

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Average pressure in September
Tonica, IL

Average pressure in September - Tonica, 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).

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Average wind speed in September
Tonica, IL

Average wind speed in September - Tonica, IL
  • Average wind speed in September: 7.4mph

The windiest months (with the highest average wind speed) are January and April (10.3mph).
The calmest month (with the lowest average wind speed) is August (6.2mph).

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Average humidity in September
Tonica, IL

Average humidity in September - Tonica, IL
  • Average humidity in September: 78%

The month with the highest relative humidity is July (85%).
The month with the lowest relative humidity is October (72%).

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Average rainfall in September
Tonica, IL

Average rainfall in September - Tonica, IL
  • Average rainfall in September: 2.28"

The wettest month (with the highest rainfall) is May (4.65").
The driest month (with the least rainfall) is February (1.57").

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Average rainfall days in September
Tonica, IL

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

The month with the highest number of rainy days is May (18.5 days).
The month with the least rainy days is January (5.5 days).

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Average snowfall in September
Tonica, IL

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

The month with the highest snowfall is January (4.37").
The months with the least snowfall are May, June, July, August and September (0").

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Average snowfall days in September
Tonica, IL

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

The month with the highest number of snowfall days is January (12.1 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

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

Average daylight in September / Average sunshine in September - Tonica, 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 18min).

  • Average sunshine in September: 8h and 5min

The month with the most sunshine is June (Average sunshine: 9h and 48min).
The month with the least sunshine is January (Average sunshine: 3h and 54min).

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Average sunshine days in September
Tonica, IL

Average sunshine days in September - Tonica, IL
  • Average sunshine days in September: 15.2 days

The month with the most sunshine days is November (17.4 days).
The month with the least sunshine days is May (10.4 days).

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Average UV index in September
Tonica, IL

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

The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January and December (UV index 1).

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Average cloud cover in September
Tonica, IL

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

The month with the most cloud cover is January (Cloud cover 59).
The month with the least cloud cover is September (Cloud cover 32).

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Average visibility in September
Tonica, IL

Average visibility in September - Tonica, 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).

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Tonica, Illinois, USA

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