July 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

What is the warmest month in St. Louis?

July is the warmest month in St. Louis, Missouri, with an average high-temperature of 89.1°F (31.7°C) and an average low-temperature of 71.1°F (21.7°C).

What is the temperature in July in St. Louis?

In St. Louis, Missouri, in July, the average high-temperature is 89.1°F (31.7°C), and the average low-temperature is 71.1°F (21.7°C).

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

In July, the average relative humidity is 68%.

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

In St. Louis, Missouri, in July, it is raining for 8.9 days, with typically 4.1" (104.4mm) of accumulated precipitation.

What are the months with the highest UV index in St. Louis?

June through August, with an average UV index of 9, are months with the highest UV index.

What is the average UV index in July in St. Louis?

The average UV index in July in St. Louis, Missouri, is 9.
Average temperature in July - St. Louis, MO
  • Average high temperature in July: 31.7°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 July: 21.7°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 July - St. Louis, MO
  • Average humidity in July: 68%

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 July - St. Louis, MO
  • Average rainfall in July: 104.4mm

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

Average rainfall days in July - St. Louis, MO
  • Average rainfall days in July: 8.9 days

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

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

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

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

The month with the highest number of snowfall days is January (4.7 days).
Months with the lowest number of snowfall days are May, June, July, August, September and October (0 days).

Average daylight in July / Average sunshine in July - St. Louis, MO
  • Average daylight in July: 14.6h

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

  • Average sunshine in July: 10h

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

Average UV index in July - St. Louis, MO
  • Average UV index in July: 9

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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