May 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 temperature in May in St. Louis?

The average high-temperature, in May, in St. Louis, is 76.3°F (24.6°C), while the average low-temperature is 57.2°F (14°C).

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

The average relative humidity in May in St. Louis, Missouri, is 66.5%.

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

In May, in St. Louis, Missouri, the rain falls for 11.9 days. Throughout May, 4.7" (119.9mm) of precipitation is accumulated.

What is the wettest month in St. Louis?

May is the month with the most rainfall in St. Louis, Missouri. Rain falls for 11.9 days and accumulates 4.7" (119.9mm) of precipitation.

Does it snow in St. Louis in May?

In May, it doesn't snow. April is the latest month when it typically snows.

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

The average UV index in May in St. Louis is 8.
Average temperature in May - St. Louis, MO
  • Average high temperature in May: 24.6°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 May: 14°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 May - St. Louis, MO
  • Average humidity in May: 66.5%

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 May - St. Louis, MO
  • Average rainfall in May: 119.9mm

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 May - St. Louis, MO
  • Average rainfall days in May: 11.9 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 May - St. Louis, MO
  • Average snowfall in May: 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 May - St. Louis, MO
  • Average snowfall days in May: 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 May / Average sunshine in May - St. Louis, MO
  • Average daylight in May: 14.3h

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 May: 8.6h

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 May - St. Louis, MO
  • Average UV index in May: 8

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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