October weather forecast and climate
St. Louis, MO

A beautiful twilight view of the Gateway Arch in St. Louis, Missouri, with a distant view of the city buildings mirrored in the waterfront
A beautiful twilight view of the Gateway Arch in St. Louis, Missouri, with a distant view of the city buildings mirrored in the waterfront
October, like September, is another pleasant autumn month in St. Louis, with average temperature ranging between min 48.9°F (9.4°C) and max 68.5°F (20.3°C).

Temperature

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

Humidity

The average relative humidity in October in St. Louis is 68.7%.

Rainfall

In St. Louis, it is raining for 8.7 days, with typically 3.33" (84.6mm) of accumulated precipitation. In St. Louis, during the entire year, the rain falls for 112.6 days and collects up to 40.96" (1040.3mm) of precipitation.

Snowfall

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

Daylight

The average length of the day in St. Louis is 11.2h.

Sunshine

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

UV index

The average daily maximum UV index in St. Louis is 4. A UV Index value of 3 to 5 symbolizes a moderate health risk from the exposure to the Sun's UV rays for the ordinary person.
Note: The daily maximum UV index of 4 in October interpret into the following advice:
Take precautions - Protection against sun damage is advised. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. 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.

What is the temperature in October in St. Louis?

In October, in St. Louis, the average high-temperature is 68.5°F (20.3°C), and the average low-temperature is 48.9°F (9.4°C).

What is the average humidity in October in St. Louis?

The average relative humidity in October in St. Louis is 68.7%.

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

In St. Louis, during October, the rain falls for 8.7 days and regularly aggregates up to 3.33" (84.6mm) of precipitation.

Does it snow in St. Louis in October?

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

When it does not snow in St. Louis?

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

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

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

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

The average sunshine in October in St. Louis, Missouri, is 6.7h.

What is the UV index reading in October in St. Louis?

The average daily maximum UV index in October in St. Louis is 4. A UV Index estimate of 3 to 5 represents a medium health risk from the exposure to the Sun's UV rays.
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).

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%).

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).

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).

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).

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).

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).

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).