October weather forecast
Harvey, IL

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Weather in October

October, the same as September, is another comfortable autumn month in Harvey, Illinois, with an average temperature varying between 46.9°F (8.3°C) and 61.2°F (16.2°C).

Temperature

The beginning of October involves a decrease in the average high-temperature, transitioning from a moderately hot 73.9°F (23.3°C) in September to a refreshing 61.2°F (16.2°C). October nights are marked by an average low-temperature of 46.9°F (8.3°C).

Humidity

October is the least humid month, with an average relative humidity of 73%.

Rainfall

In October, the rain falls for 14.3 days. Throughout October, 2.76" (70mm) of precipitation is accumulated. Throughout the year, there are 155.6 rainfall days, and 31.3" (795mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through April, October through December. October is the first month it typically snows. Throughout October, in the average 0.3 snowfall days, it receives 0.08" (2mm) of snow. Throughout the year, there are 44.6 snowfall days, and 16.46" (418mm) of snow is accumulated.

Daylight

The average length of the day in October in Harvey is 11h and 4min.
On the first day of October, sunrise is at 6:48 am and sunset at 6:31 pm. On the last day of the month, sunrise is at 7:22 am and sunset at 5:46 pm CDT.

Sunshine

In Harvey, the average sunshine in October is 5.9h.

UV index

In October, the average daily maximum UV index is 2. A UV Index value of 2, and less, symbolizes a minimal health hazard from exposure to the Sun's UV radiation for the average person.
Note: A typical high UV index of 2 in October suggests the following recommendations:
The majority are not significantly affected by prolonged sun exposure. Infants, children, and those with fair skin must always have protection. The Sun's harshest UV rays are around midday; it's wise to seek shade and limit time outdoors. Tightly woven clothing, when worn loosely, shields effectively against the Sun. Note well! The intensity of the Sun's UV rays can be nearly doubled by snow reflection.

Frequently asked questions

What is the average October temperature?

The average high-temperature and low-temperature during October are 61.2°F (16.2°C) and 46.9°F (8.3°C) respectively. In July, the average heat index (a.k.a. 'feels like', 'real feel'), which combines air temperature and relative humidity, is computed to be 87.8°F (31°C).

What is the least humid month?

October is the least humid month, with an average relative humidity of 73%.

What is the average humidity in October?

In October, the average relative humidity is 73%.

How much does it rain in October?

In Harvey, in October, during 14.3 rainfall days, 2.76" (70mm) of precipitation is typically accumulated.

When does it start to snow in Harvey?

October is the first month it typically snows. Throughout October, in the average 0.3 snowfall days, it receives 0.08" (2mm) of snow.

How many hours of daylight does Harvey have in October?

In October, the average day length is 11h and 4min.

When is the sunrise / sunset in October?

On the first day of October, sunrise is at 6:48 am and sunset at 6:31 pm. On the last day of the month, sunrise is at 7:22 am and sunset at 5:46 pm CDT.

How many hours of sunshine does Harvey have in October?

The average sunshine duration in October is 5.9h.

What is the UV index reading in October?

The average daily maximum UV index in October in Harvey is 2. A UV Index value of 2, and less, symbolizes a low health threat from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in October
Harvey, IL

Average temperature in October - Harvey, IL
  • Average high temperature in October: 61.2°F

The warmest month (with the highest average high temperature) is July (81.3°F).
The month with the lowest average high temperature is January (29.7°F).

  • Average low temperature in October: 46.9°F

The month with the highest average low temperature is July (65.8°F).
The coldest month (with the lowest average low temperature) is January (18.9°F).

Average pressure in October
Harvey, IL

Average pressure in October - Harvey, IL
  • Average pressure in October: 30.01"Hg

The month with the highest atmospheric pressure is January (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).

Average wind speed in October
Harvey, IL

Average wind speed in October - Harvey, IL
  • Average wind speed in October: 9.1mph

The windiest month (with the highest average wind speed) is January (10.2mph).
The calmest month (with the lowest average wind speed) is August (6.3mph).

Average humidity in October
Harvey, IL

Average humidity in October - Harvey, IL
  • Average humidity in October: 73%

The months with the highest relative humidity are January and February (82%).
The month with the lowest relative humidity is October (73%).

Average rainfall in October
Harvey, IL

Average rainfall in October - Harvey, IL
  • Average rainfall in October: 2.76"

The wettest month (with the highest rainfall) is May (4.17").
The driest month (with the least rainfall) is December (1.54").

Average rainfall days in October
Harvey, IL

Average rainfall days in October - Harvey, IL
  • Average rainfall days in October: 14.3 days

The month with the highest number of rainy days is July (17.6 days).
The month with the least rainy days is February (6.1 days).

Average snowfall in October
Harvey, IL

Average snowfall in October - Harvey, IL
  • Average snowfall in October: 0.08"

The month with the highest snowfall is January (4.53").
The months with the least snowfall are May, June, July, August and September (0").

Average snowfall days in October
Harvey, IL

Average snowfall days in October - Harvey, IL
  • Average snowfall days in October: 0.3 days

The month with the highest number of snowfall days is January (12.6 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

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

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 12min).

  • Average sunshine in October: 5h and 5min

The month with the most sunshine is August (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 3h and 36min).

Average sunshine days in October
Harvey, IL

Average sunshine days in October - Harvey, IL
  • Average sunshine days in October: 14.4 days

The month with the most sunshine days is November (16.4 days).
The month with the least sunshine days is April (10.2 days).

Average UV index in October
Harvey, IL

Average UV index in October - Harvey, IL
  • Average UV index in October: 2

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

Average cloud cover in October
Harvey, IL

Average cloud cover in October - Harvey, IL
  • Average cloud cover in October: 42

The month with the most cloud cover is January (Cloud cover 62).
The month with the least cloud cover is August (Cloud cover 30).

Average visibility in October
Harvey, IL

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

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

Harvey, Illinois, USA

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