October weather forecast and climate
Decatur, IL

Weather in October

October, like September, in Decatur, Illinois, is another comfortable autumn month, with average temperature fluctuating between 48°F (8.9°C) and 64°F (17.8°C).

Temperature

In Decatur, the average high-temperature decreases, from a warm 77°F (25°C) in September, to an enjoyable 64°F (17.8°C). In October, in Decatur, the average low-temperature is 48°F (8.9°C).

Humidity

October is the least humid month in Decatur, with an average relative humidity of 70%.

Rainfall

In October, in Decatur, the rain falls for 9.5 days. Throughout October, 1.22" (31mm) of precipitation is accumulated. Throughout the year, in Decatur, Illinois, there are 130.2 rainfall days, and 16.34" (415mm) of precipitation is accumulated.

Snowfall

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

Daylight

The average length of the day in Decatur is 11.1h.

Sunshine

The average sunshine in Decatur, Illinois, is 6.3h.

UV index

The average daily maximum UV index in Decatur is 3. A UV Index of 3 to 5 symbolizes a medium vulnerability from the exposure to the Sun's UV radiation for ordinary individuals.
Note: The daily maximum UV index of 3 in October interpret into the following advice:
Take precautions. Light skin individuals may get burned in less than 30 minutes. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.
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FAQ

What is the least humid month in Decatur?

With an average relative humidity of 70%, October is the least humid month.

What is the average humidity in October in Decatur?

The average relative humidity in October in Decatur is 70%.

How much does it rain in Decatur in October?

In Decatur, Illinois, during October, the rain falls for 9.5 days and regularly aggregates up to 1.22" (31mm) of precipitation.

When it does not snow in Decatur?

May through October are months without snowfall.

Does it snow in Decatur in October?

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

How many hours of daylight does Decatur have in October?

In October, the average length of the day is 11.1h.

How long on average sun shines in October in Decatur?

The average sunshine in October in Decatur is 6.3h.

What is the UV index intensity in October in Decatur?

The average daily maximum UV index in October in Decatur is 3. A UV Index estimate of 3 to 5 represents a moderate vulnerability from unsafe exposure to the Sun's UV rays.

Average temperature in October
Decatur, IL

Average temperature in October - Decatur, IL
  • Average high temperature in October: 64°F

The warmest month (with the highest average high temperature) is July (82°F).
The month with the lowest average high temperature is January (32.9°F).

  • Average low temperature in October: 48°F

The month with the highest average low temperature is July (65.7°F).
The coldest month (with the lowest average low temperature) is January (21.2°F).

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Average pressure in October
Decatur, IL

Average pressure in October - Decatur, IL
  • Average pressure in October: 30.03"

The month with the highest atmospheric pressure is January (30.15").
The month with the lowest atmospheric pressure is June (29.92").

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Average wind speed in October
Decatur, IL

Average wind speed in October - Decatur, IL
  • Average wind speed in October: 9.4mph

The windiest month (with the highest average wind speed) is January (10.7mph).
The calmest months (with the lowest average wind speed) are July and August (6.3mph).

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Average humidity in October
Decatur, IL

Average humidity in October - Decatur, IL
  • Average humidity in October: 70%

The month with the highest relative humidity is July (84%).
The month with the lowest relative humidity is October (70%).

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Average rainfall in October
Decatur, IL

Average rainfall in October - Decatur, IL
  • Average rainfall in October: 1.22"

The wettest month (with the highest rainfall) is May (2.01").
The driest months (with the least rainfall) are February and December (0.87").

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Average rainfall days in October
Decatur, IL

Average rainfall days in October - Decatur, IL
  • Average rainfall days in October: 9.5 days

The month with the highest number of rainy days is May (17 days).
The month with the least rainy days is February (5.8 days).

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Average snowfall in October
Decatur, IL

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

The month with the highest snowfall is January (1.85").
Months with the least snowfall are May, June, July, August, September and October (0").

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Average snowfall days in October
Decatur, IL

Average snowfall days in October - Decatur, IL
  • Average snowfall days in October: 0 days

The month with the highest number of snowfall days is January (7.2 days).
Months with the least snowfall days are May, June, July, August, September and October (0 days).

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

Average daylight in October / Average sunshine in October - Decatur, IL
  • Average daylight in October: 11.1h

The month with the longest days is June (Average daylight: 15h).
The month with the shortest days is December (Average daylight: 9.4h).

  • Average sunshine in October: 6.3h

The month with the most sunshine is June (Average sunshine: 10.4h).
The month with the least sunshine is January (Average sunshine: 4.1h).

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Average sunshine days in October
Decatur, IL

Average sunshine days in October - Decatur, IL
  • Average sunshine days in October: 19.8 days

The month with the most sunshine days is October (19.8 days).
The month with the least sunshine days is May (11.5 days).

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Average UV index in October
Decatur, IL

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

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

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Average cloud cover in October
Decatur, IL

Average cloud cover in October - Decatur, IL
  • Average cloud cover in October: 35

The month with the most cloud cover is January (Cloud cover 56).
The month with the least cloud cover is September (Cloud cover 29).

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Average visibility in October
Decatur, IL

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

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

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