October weather forecast and climate
St. Louis, MO

A beautiful twilight over the Gateway Arch in St. Louis, Missouri
A beautiful twilight over the Gateway Arch in St. Louis, Missouri

Weather in October

October, the same as September, in St. Louis, Missouri, is another pleasant autumn month, with temperature in the range of an average high of 68.5°F (20.3°C) and an average low of 48.9°F (9.4°C).

Temperature

In St. Louis, the average high-temperature drops, from a moderately hot 80.2°F (26.8°C) in September, to an agreeable 68.5°F (20.3°C). In St. Louis, in October, the average low-temperature is 48.9°F (9.4°C).

Humidity

In October, the average relative humidity in St. Louis, Missouri, is 68.7%.

Rainfall

In St. Louis, Missouri, during October, the rain falls for 8.7 days and regularly aggregates up to 3.33" (84.6mm) of precipitation. Throughout the year, in St. Louis, there are 112.6 rainfall days, and 40.96" (1040.3mm) of precipitation is accumulated.

Snowfall

May through October are months without snowfall in St. Louis.

Daylight

In October, the average length of the day in St. Louis, Missouri, is 11.2h.

Sunshine

In October, the average sunshine in St. Louis is 6.7h.

UV index

In October, the average daily maximum UV index in St. Louis is 4. A UV Index reading of 3 to 5 represents a medium health hazard from unsafe exposure to the UV radiation for the ordinary person.
Note: In October, the average maximum UV index of 4 translate into the following recommendations:
Take precautions - Protection against sunburn is recommended. 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 average humidity in October in St. Louis?

The average relative humidity in October is 68.7%.

How many days does it rain in October in St. Louis?

In St. Louis, in October, during 8.7 rainfall days, 3.33" (84.6mm) of precipitation is typically accumulated.

When it does not snow in St. Louis?

In St. Louis snow does not fall in May through October.

Does it snow in St. Louis in October?

In St. Louis, Missouri, in October, it doesn't snow. In November, it regularly snows.

How many hours of daylight does St. Louis have in October?

In St. Louis, the average length of the day in October is 11.2h.

How long on average sun shines in October in St. Louis?

In October, the average sunshine in St. Louis is 6.7h.

How high is the UV index in October in St. Louis?

In St. Louis, Missouri, the average daily maximum UV index in October is 4. A UV Index estimate of 3 to 5 represents a moderate health threat from unprotected exposure to the UV radiation.

Average temperature in October
St. Louis, MO

Average temperature in October - St. Louis, MO
  • Average high temperature in October: 20.3°C

The warmest month (with the highest average high temperature) is July (31.7°C).
The month with the lowest average high temperature is January (4.4°C).

  • Average low temperature in October: 9.4°C

The month with the highest average low temperature is July (21.7°C).
The coldest month (with the lowest average low temperature) is January (-4.6°C).

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Average humidity in October
St. Louis, MO

Average humidity in October - St. Louis, MO
  • Average humidity in October: 68.7%

The month with the highest relative humidity is December (75.8%).
The month with the lowest relative humidity is April (63.5%).

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Average rainfall in October
St. Louis, MO

Average rainfall in October - St. Louis, MO
  • Average rainfall in October: 84.6mm

The wettest month (with the highest rainfall) is May (119.9mm).
The driest month (with the least rainfall) is February (56.9mm).

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Average rainfall days in October
St. Louis, MO

Average rainfall days in October - St. Louis, MO
  • Average rainfall days in October: 8.7 days

The month with the highest number of rainy days is May (11.9 days).
The month with the least rainy days is September (7.4 days).

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Average snowfall in October
St. Louis, MO

Average snowfall in October - St. Louis, MO
  • Average snowfall in October: 0mm

The month with the highest snowfall is January (142.2mm).
Months with the least snowfall are May, June, July, August, September and October (0mm).

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Average snowfall days in October
St. Louis, MO

Average snowfall days in October - St. Louis, MO
  • Average snowfall days in October: 0 days

The month with the highest number of snowfall days is January (4.7 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
St. Louis, MO

Average daylight in October / Average sunshine in October - St. Louis, MO
  • Average daylight in October: 11.2h

The month with the longest days is June (Average daylight: 14.8h).
The month with the shortest days is December (Average daylight: 9.5h).

  • Average sunshine in October: 6.7h

The month with the most sunshine is July (Average sunshine: 10h).
The month with the least sunshine is December (Average sunshine: 4.2h).

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Average UV index in October
St. Louis, MO

Average UV index in October - St. Louis, MO
  • Average UV index in October: 4

Months with the highest UV index are June, July and August (UV index 9).
Months with the lowest UV index are January and December (UV index 2).

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