May weather forecast
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 May

The last month of the spring, May, is a warm month in St. Louis, with an average temperature ranging between min 57.2°F (14°C) and max 76.3°F (24.6°C).

Temperature

In St. Louis, the average high-temperature in May marginally rises from an enjoyable 67.5°F (19.7°C) in April to a warm 76.3°F (24.6°C). In St. Louis, Missouri, the average low-temperature is 57.2°F (14°C).

Humidity

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

Rainfall

May is the month with the most rainfall in St. Louis. Rain falls for 11.9 days and accumulates 4.72" (119.9mm) of precipitation.

Snowfall

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

Daylight

In May, the average length of the day in St. Louis is 14h and 17min.
On the first day of the month, sunrise is at 6:02 am and sunset at 7:52 pm. On the last day of May, in St. Louis, Missouri, sunrise is at 5:38 am and sunset at 8:18 pm CDT.

Sunshine

In May, the average sunshine in St. Louis is 8.6h.

UV index

In St. Louis, Missouri, the average daily maximum UV index in May is 8. A UV Index of 8 to 10 symbolizes a very high health risk from exposure to the Sun's UV rays for the ordinary person.
Note: The average daily UV index of 8 in May transform into the following instructions:
Take extra precautions. Fair-skinned individuals may get burned in less than 10 minutes. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
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FAQ

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

The average relative humidity in May is 66.5%.

What is the rainiest month in St. Louis?

May is the month with the most rainfall. Rain falls for 11.9 days and accumulates 4.72" (119.9mm) of precipitation.

How much does it rain in St. Louis in May?

In St. Louis, Missouri, in May, it is raining for 11.9 days, with typically 4.72" (119.9mm) of accumulated precipitation.

When it does not snow in St. Louis?

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

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 length of the day in May in St. Louis?

The average day length in May is 14h and 17min.

When are sunrise and sunset in May in St. Louis?

On the first day of May, sunrise is at 6:02 am and sunset at 7:52 pm. On the last day of the month, sunrise is at 5:38 am and sunset at 8:18 pm CDT.

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

The average sunshine duration in May in St. Louis is 8.6h.

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

In May, the average daily maximum UV index is 8. A UV Index reading of 8 to 10 represents a very high health threat from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average sunshine
Average UV index

Average temperature in May
St. Louis, MO

Average temperature in May - St. Louis, MO
  • Average high temperature in May: 76.3°F

The warmest month (with the highest average high temperature) is July (89.1°F).
The month with the lowest average high temperature is January (39.9°F).

  • Average low temperature in May: 57.2°F

The month with the highest average low temperature is July (71°F).
The coldest month (with the lowest average low temperature) is January (23.7°F).

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Average humidity in May
St. Louis, MO

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%).

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Average rainfall in May
St. Louis, MO

Average rainfall in May - St. Louis, MO
  • Average rainfall in May: 4.7"

The wettest month (with the highest rainfall) is May (4.7").
The driest month (with the least rainfall) is February (2.2").

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Average rainfall days in May
St. Louis, MO

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 least rainy days is September (7.4 days).

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Average snowfall in May
St. Louis, MO

Average snowfall in May - St. Louis, MO
  • Average snowfall in May: 0"

The month with the highest snowfall is January (5.6").
The months with the least snowfall are May, June, July, August, September and October (0").

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Average snowfall days in May
St. Louis, MO

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).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

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Average daylight in May /
Average sunshine in May
St. Louis, MO

Average daylight in May / Average sunshine in May - St. Louis, MO
  • Average daylight in May: 14h and 17min

The month with the longest days is June (Average daylight: 14h and 49min).
The month with the shortest days is December (Average daylight: 9h and 31min).

  • Average sunshine in May: 8h and 36min

The month with the most sunshine is July (Average sunshine: 10h and 0min).
The month with the least sunshine is December (Average sunshine: 4h and 12min).

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Average UV index in May
St. Louis, MO

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

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

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