October weather forecast
Belleville, IL

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Weather in October

Autumn solidifies its grip on Belleville during the month of October. The season of 'falling leaves' breathes a wave of cultural and scenic transformation, making October a picturesque time in the city. The dwindling warm days succumb to a crisp, cool climate, making way for mellow, autumnal evenings. Yet, October eases from summer's warmth to autumn's coolness, balancing the temperatures in a spectacular environmental equilibrium. Between the accenting fall colors and crisp air, October signals the full onset of the autumn season in Belleville.

Temperature

Belleville's average high-temperature decreases in October, falling from a moderately hot 79.3°F (26.3°C) in September to a comfortable 66.7°F (19.3°C). The temperature lowers to an average of 48.9°F (9.4°C) during October nights.

Humidity

With an average relative humidity of 71%, October is the least humid month.

Rainfall

In October, the rain falls for 10.6 days. Throughout October, 2.95" (75mm) of precipitation is accumulated. In Belleville, during the entire year, the rain falls for 147.1 days and collects up to 35.43" (900mm) of precipitation.

Snowfall

In Belleville, snow does not fall in April through October.

Daylight

In Belleville, the average length of the day in October is 11h and 11min.
On the first day of the month, sunrise is at 6:56 am and sunset at 6:42 pm. On the last day of October, sunrise is at 7:26 am and sunset at 6:00 pm CDT.

Sunshine

In Belleville, the average sunshine in October is 6.1h.

UV index

In Belleville, the average daily maximum UV index in October is 3. A UV Index estimate of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV rays for the ordinary person.
Note: The average daily UV index of 3 in October transforms into the following instructions:
Act with care - The suggestion to avoid sunburn is emphasized. Direct Sun exposure should be minimized especially during midday when radiation is most intense. Consider a wide-brim hat essential for effective sun defense covering your face, neck, and eyes. Attention! Nearly twice the Sun's UV radiation can be reflected by snow.

Frequently asked questions

What are the temperatures in October?

In Belleville, 66.7°F (19.3°C) is the average high-temperature and 48.9°F (9.4°C) is the average low-temperature during October. The average heat index (a.k.a. 'feels like', 'real feel'), which factors the actual air temperature with the relative humidity, in August is computed to be 95°F (35°C).

What is the least humid month?

October is the least humid month, with an average relative humidity of 71%.

What is the average humidity in October?

In Belleville, Illinois, the average relative humidity in October is 71%.

How much does it rain in October?

In Belleville, in October, it is raining for 10.6 days, with typically 2.95" (75mm) of accumulated precipitation.

When it does not snow?

In Belleville, snow does not fall in April through October.

Does it snow in October?

In Belleville, in October, it doesn't snow. In November, it regularly snows.

What is the average length of the day in October?

The average day length in October is 11h and 11min.

When are sunrise and sunset in October?

On the first day of October, sunrise is at 6:56 am and sunset at 6:42 pm. On the last day of the month, sunrise is at 7:26 am and sunset at 6:00 pm CDT.

How long on average sun shines in October?

In Belleville, the average sunshine duration in October is 6.1h.

How high is the UV index in October in Belleville?

In Belleville, the average daily maximum UV index in October is 3. A UV Index value of 3 to 5 symbolizes a moderate vulnerability from exposure to the Sun's 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 October
Belleville, IL

Average temperature in October - Belleville, IL
  • Average high temperature in October: 66.7°F

The warmest month (with the highest average high temperature) is July (85.8°F).
The month with the lowest average high temperature is January (37.8°F).

  • Average low temperature in October: 48.9°F

The month with the highest average low temperature is July (68.4°F).
The coldest month (with the lowest average low temperature) is January (24.8°F).

Average pressure in October
Belleville, IL

Average pressure in October - Belleville, IL
  • Average pressure in October: 30.03"Hg

The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).

Average wind speed in October
Belleville, IL

Average wind speed in October - Belleville, IL
  • Average wind speed in October: 7.9mph

The windiest month (with the highest average wind speed) is January (9.4mph).
The calmest month (with the lowest average wind speed) is July (5.6mph).

Average humidity in October
Belleville, IL

Average humidity in October - Belleville, IL
  • Average humidity in October: 71%

The months with the highest relative humidity are May and July (79%).
The month with the lowest relative humidity is October (71%).

Average rainfall in October
Belleville, IL

Average rainfall in October - Belleville, IL
  • Average rainfall in October: 2.95"

The wettest month (with the highest rainfall) is May (4.37").
The driest month (with the least rainfall) is February (1.93").

Average rainfall days in October
Belleville, IL

Average rainfall days in October - Belleville, IL
  • Average rainfall days in October: 10.6 days

The month with the highest number of rainy days is May (16.4 days).
The month with the least rainy days is January (6.8 days).

Average snowfall in October
Belleville, IL

Average snowfall in October - Belleville, IL
  • Average snowfall in October: 0"

The month with the highest snowfall is January (2.4").
The months with the least snowfall are April, May, June, July, August, September and October (0").

Average snowfall days in October
Belleville, IL

Average snowfall days in October - Belleville, IL
  • Average snowfall days in October: 0.1 days

The month with the highest number of snowfall days is January (7.3 days).
The months with the least snowfall days are May, June, July and August (0 days).

Average daylight in October /
Average sunshine in October
Belleville, IL

Average daylight in October / Average sunshine in October - Belleville, IL
  • Average daylight in October: 11h and 1min

The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).

  • Average sunshine in October: 6h and 1min

The month with the most sunshine is June (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 4h and 30min).

Average sunshine days in October
Belleville, IL

Average sunshine days in October - Belleville, IL
  • Average sunshine days in October: 18.3 days

The month with the most sunshine days is October (18.3 days).
The month with the least sunshine days is May (12.3 days).

Average UV index in October
Belleville, IL

Average UV index in October - Belleville, IL
  • Average UV index in October: 3

The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January, February and December (UV index 2).

Average cloud cover in October
Belleville, IL

Average cloud cover in October - Belleville, IL
  • Average cloud cover in October: 34

The month with the most cloud cover is January (Cloud cover 52).
The month with the least cloud cover is June (Cloud cover 29).

Average visibility in October
Belleville, IL

Average visibility in October - Belleville, IL
  • Average visibility in October: 6mi

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

Belleville, Illinois, USA

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