October weather forecast
O'Fallon, MO

Today
Tomorrow
Long-term
YearJFMAMJJASOctoberND
°Celsius°Fahrenheit
englishespañol中文
Share

Contents

Weather in October

The highlight of October is the unmistakable autumn coolness, as temperatures take a significant downward plunge from its September counterpart. October, being an autumn month, enjoys a generous amount of daylight hours and adequate sunshine that adds to the crispiness of fall. This season is drier with rainfall slipping to 1.73" (44mm) and having fewer rainy days. However, residents must prepare for gusty winds, as wind speeds escalate quite radically during this time of the year. As October progresses, the surroundings turn more scenic, setting the stage for November's winter preview.

Temperature

As O'Fallon enters October, the average high-temperature decreases from the a moderately hot 79.5°F (26.4°C) of September to an enjoyable 66.2°F (19°C). O'Fallon's temperature drops to an average low of 48.7°F (9.3°C) during the nights of October.

Humidity

The least humid month is October, with an average relative humidity of 70%.

Rainfall

In O'Fallon, Missouri, during October, the rain falls for 9.8 days and regularly aggregates up to 1.73" (44mm) of precipitation. In O'Fallon, Missouri, during the entire year, the rain falls for 132.3 days and collects up to 21.06" (535mm) of precipitation.

Snowfall

April through October are months without snowfall.

Daylight

In O'Fallon, the average length of the day in October is 11h and 10min.
On the first day of the month, sunrise is at 6:59 am and sunset at 6:45 pm. On the last day of October, sunrise is at 7:29 am and sunset at 6:03 pm CDT.

Sunshine

In O'Fallon, the average sunshine in October is 6.2h.

UV index

The average daily maximum UV index in October is 3. A UV Index reading of 3 to 5 represents a moderate health risk from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: In October, a daily maximum UV index of 3 leads to the following instructions:
Stay alert. Light-skinned people could suffer burns in less than 30 minutes. Given the potency of the midday Sun's UV radiation, one should avoid prolonged exposure. To mitigate harm from sun exposure, pick sunglasses offering UVA and UVB defense.
[Resources]

Frequently asked questions

What are the temperatures in O'Fallon in October?

The average high-temperature, in October, in O'Fallon, is 66.2°F (19°C), while the average low-temperature is 48.7°F (9.3°C). The average heat index (a.k.a. 'real feel', 'felt air temperature'), which takes the relative humidity and factors it into the air temperature reading, in August is evaluated at 95°F (35°C).

What is the least humid month in O'Fallon?

The least humid month is October, with an average relative humidity of 70%.

What is the average humidity in October in O'Fallon?

The average relative humidity in October is 70%.

How many days does it rain in October in O'Fallon?

In O'Fallon, in October, it is raining for 9.8 days, with typically 1.73" (44mm) of accumulated precipitation.

When it does not snow in O'Fallon?

April through October are months without snowfall in O'Fallon.

Does it snow in O'Fallon in October?

In O'Fallon, Missouri, in October, it doesn't snow. In November, it regularly snows.

What is the average length of the day in October in O'Fallon?

The average day length in October in O'Fallon is 11h and 10min.

When is the sunrise / sunset in October in O'Fallon?

In October, on the first day of the month, sunrise is at 6:59 am and sunset at 6:45 pm. On the last day of the month, in O'Fallon, sunrise is at 7:29 am and sunset at 6:03 pm CDT.

How long on average sun shines in October in O'Fallon?

In October, the average sunshine duration in O'Fallon is 6.2h.

What is the UV index reading in October in O'Fallon?

In October, the average daily maximum UV index in O'Fallon, Missouri, is 3. A UV Index value of 3 to 5 symbolizes a moderate vulnerability from exposure to Sun's UV rays.
Today
Tomorrow
Long-term
YearJFMAMJJASOctoberND
Sep
October
Nov
Average high temperature
79.5°F 26.4°C
66.2°F 19°C
53.2°F 11.8°C
Average low temperature
60.1°F 15.6°C
48.7°F 9.3°C
37.6°F 3.1°C
Average pressure
30.02" 763mmHg
30.03" 763mmHg
30.12" 765mmHg
Average wind speed
6.1mph 9.8km/h
7.8mph 12.6km/h
8.5mph 13.7km/h
Average max. wind speed
6.8mph 10.9km/h
8.6mph 13.8km/h
9.1mph 14.6km/h
Average wind speed gusts
10.1mph 16.3km/h
12.6mph 20.3km/h
13.7mph 22km/h
Average humidity
73%
70%
73%
Average rainfall
1.42" 36mm
1.73" 44mm
0.98" 25mm
Average rainfall days
11.3
9.8
7
Average snowfall
0" 0mm
0" 0mm
0.28" 7mm
Average snowfall days
0
0
1.3
Average daylight
12h 2min
11h 1min
10h 1min
Average sunshine
9h 3min
6h 1min
5h 2min
Average sunshine days
16.7
20.1
20.5
Average UV index
5
3
2
Average cloud cover
28%
33%
38%
Average visibility
6mi 9.7km
6mi 9.7km
6mi 9.7km

Average temperature in October
O'Fallon, MO

Average temperature in October - O
  • Average high temperature in October: 66.2°F

The warmest month (with the highest average high temperature) is July (87.1°F).
The month with the lowest average high temperature is January (37.4°F).

  • Average low temperature in October: 48.7°F

The month with the highest average low temperature is July (68.5°F).
The coldest month (with the lowest average low temperature) is January (23.7°F).

[Resources]

Average pressure in October
O'Fallon, MO

Average pressure in October - O
  • 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).

[Resources]

Average wind speed in October
O'Fallon, MO

Average wind speed in October - O
  • Average wind speed in October: 7.8mph

The windiest month (with the highest average wind speed) is January (9.1mph).
The calmest month (with the lowest average wind speed) is July (5.5mph).

[Resources]

Average humidity in October
O'Fallon, MO

Average humidity in October - O
  • Average humidity in October: 70%

The month with the highest relative humidity is May (79%).
The month with the lowest relative humidity is October (70%).

[Resources]

Average rainfall in October
O'Fallon, MO

Average rainfall in October - O
  • Average rainfall in October: 1.73"

The wettest month (with the highest rainfall) is May (2.76").
The driest month (with the least rainfall) is December (0.91").

[Resources]

Average rainfall days in October
O'Fallon, MO

Average rainfall days in October - O
  • Average rainfall days in October: 9.8 days

The month with the highest number of rainy days is May (15.7 days).
The month with the least rainy days is February (6.8 days).

[Resources]

Average snowfall in October
O'Fallon, MO

Average snowfall in October - O
  • Average snowfall in October: 0"

The month with the highest snowfall is February (1.61").
The months with the least snowfall are April, May, June, July, August, September and October (0").

[Resources]

Average snowfall days in October
O'Fallon, MO

Average snowfall days in October - O
  • Average snowfall days in October: 0 days

The months with the highest number of snowfall days are January and February (5.8 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

[Resources]

Average daylight in October /
Average sunshine in October
O'Fallon, MO

Average daylight in October / Average sunshine in October - O
  • 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 30min).
The months with the least sunshine are January and February (Average sunshine: 4h and 42min).

[Resources]

Average sunshine days in October
O'Fallon, MO

Average sunshine days in October - O
  • Average sunshine days in October: 20.1 days

The month with the most sunshine days is December (20.6 days).
The month with the least sunshine days is July (12.6 days).

[Resources]

Average UV index in October
O'Fallon, MO

Average UV index in October - O
  • 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, November and December (UV index 2).

[Resources]

Average cloud cover in October
O'Fallon, MO

Average cloud cover in October - O
  • Average cloud cover in October: 33

The month with the most cloud cover is January (Cloud cover 50).
The months with the least cloud cover are June, July, August and September (Cloud cover 28).

[Resources]

Average visibility in October
O'Fallon, MO

Average visibility in October - O
  • 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).

[Resources]

O'Fallon, Missouri, USA

Weather forecast for today
Weather forecast for tomorrow
10 days weather forecast
Climate data
1January
2February
3March
4April
5May
6June
7July
8August
9September
10October
11November
12December

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location