May weather forecast
Clayton, MO

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Weather in May

May, the last month of the spring in Clayton, is a moderately hot month, with an average temperature varying between 57.7°F (14.3°C) and 74.8°F (23.8°C).

Temperature

The shift into May brings an increase in the average high-temperature, moving from an enjoyable 65.5°F (18.6°C) in April to a moderately hot 74.8°F (23.8°C). Clayton, during May nights, observes an average temperature of 57.7°F (14.3°C).

Humidity

With an average relative humidity of 78%, May is the most humid month.

Rainfall

The month with the most rainfall is May, when the rain falls for 16.9 days and typically aggregates up to 3.58" (91mm) of precipitation.

Snowfall

In Clayton, snow does not fall in April through October.

Daylight

In Clayton, the average length of the day in May is 14h and 18min.
On the first day of May in Clayton, sunrise is at 6:02 am and sunset at 7:53 pm. On the last day of the month, sunrise is at 5:38 am and sunset at 8:19 pm CDT.

Sunshine

The average sunshine in May in Clayton is 9.5h.

UV index

The months with the highest UV index in Clayton are May through August, with an average maximum UV index of 6. A UV Index value of 6 to 7 symbolizes a high health risk from unprotected exposure to Sun's UV rays for average individuals.
Note: A maximum UV index of 6 in May translates into the following recommendations:
Take precautions and utilize sun safety practices. Protection against skin and eye damage is required. Be aware that the sun's UV radiation is strongest between 10 a.m. and 4 p.m. and try to reduce direct sun exposure during this period as much as possible. Combat UV radiation's detrimental effects with sun-safe clothing and UV-blocking eyewear.
Resources | Updated: Feb 12, 2024 | Published by: Weather U.S.

Frequently asked questions

What is the usual temperature for Clayton in May?

The high-temperature, in May, in Clayton, is 74.8°F (23.8°C), while the low-temperature averages to 57.7°F (14.3°C).

What is the most humid month in Clayton?

With an average relative humidity of 78%, May is the most humid month in Clayton, Missouri.

What is the average humidity in May in Clayton?

In May, the average relative humidity in Clayton is 78%.

What is the rainiest month in Clayton?

May is the month with the most rainfall in Clayton, Missouri. Rain falls for 16.9 days and accumulates 3.58" (91mm) of precipitation.

How much does it rain in Clayton in May?

In Clayton, Missouri, in May, during 16.9 rainfall days, 3.58" (91mm) of precipitation is typically accumulated.

When it does not snow in Clayton?

In Clayton, Missouri, snow does not fall in April through October.

How many hours of daylight does Clayton have in May?

In May, the average day length in Clayton is 14h and 18min.

What time are sunrise and sunset in May in Clayton?

In May, on the first day of the month, sunrise is at 6:02 am and sunset at 7:53 pm. On the last day of the month, in Clayton, Missouri, sunrise is at 5:38 am and sunset at 8:19 pm CDT.

How long on average sun shines in May in Clayton?

The average sunshine duration in May in Clayton, Missouri, is 9.5h.

What are the months with the highest UV index in Clayton?

May through August, with an average maximum UV index of 6, are months with the highest UV index in Clayton, Missouri.

What is the UV index reading in May in Clayton?

In Clayton, Missouri, the average daily maximum UV index in May is 6. A UV Index of 6 to 7 symbolizes a high health threat from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in May
Clayton, MO

Average temperature in May - Clayton, MO
  • Average high temperature in May: 74.8°F

The warmest month (with the highest average high temperature) is July (86.9°F).
The month with the lowest average high temperature is January (37.8°F).

  • Average low temperature in May: 57.7°F

The month with the highest average low temperature is July (69.1°F).
The coldest month (with the lowest average low temperature) is January (24.3°F).

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Average pressure in May
Clayton, MO

Average pressure in May - Clayton, MO
  • Average pressure in May: 29.95"Hg

The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).

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Average wind speed in May
Clayton, MO

Average wind speed in May - Clayton, MO
  • Average wind speed in May: 7.2mph

The windiest month (with the highest average wind speed) is January (9.2mph).
The calmest months (with the lowest average wind speed) are July and August (5.5mph).

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Average humidity in May
Clayton, MO

Average humidity in May - Clayton, MO
  • Average humidity in May: 78%

The month with the highest relative humidity is May (78%).
The month with the lowest relative humidity is October (70%).

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Average rainfall in May
Clayton, MO

Average rainfall in May - Clayton, MO
  • Average rainfall in May: 3.58"

The wettest month (with the highest rainfall) is May (3.58").
The driest month (with the least rainfall) is February (1.69").

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Average rainfall days in May
Clayton, MO

Average rainfall days in May - Clayton, MO
  • Average rainfall days in May: 16.9 days

The month with the highest number of rainy days is May (16.9 days).
The month with the least rainy days is January (6.5 days).

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Average snowfall in May
Clayton, MO

Average snowfall in May - Clayton, MO
  • Average snowfall in May: 0"

The month with the highest snowfall is February (2.6").
The months with the least snowfall are April, May, June, July, August, September and October (0").

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Average snowfall days in May
Clayton, MO

Average snowfall days in May - Clayton, MO
  • Average snowfall days in May: 0 days

The month with the highest number of snowfall days is February (5.2 days).
The months with the least snowfall days are May, June, July and August (0 days).

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Average daylight in May /
Average sunshine in May
Clayton, MO

Average daylight in May / Average sunshine in May - Clayton, MO
  • Average daylight in May: 14h and 2min

The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).

  • Average sunshine in May: 9h and 3min

The months with the most sunshine are June and July (Average sunshine: 10h and 30min).
The month with the least sunshine is January (Average sunshine: 4h and 36min).

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Average sunshine days in May
Clayton, MO

Average sunshine days in May - Clayton, MO
  • Average sunshine days in May: 11.5 days

The month with the most sunshine days is January (21 days).
The month with the least sunshine days is June (11.2 days).

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Average UV index in May
Clayton, MO

Average UV index in May - Clayton, MO
  • Average UV index in May: 6

The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January, February and December (UV index 2).

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Average cloud cover in May
Clayton, MO

Average cloud cover in May - Clayton, MO
  • Average cloud cover in May: 36

The month with the most cloud cover is January (Cloud cover 50).
The month with the least cloud cover is August (Cloud cover 27).

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Average visibility in May
Clayton, MO

Average visibility in May - Clayton, MO
  • Average visibility in May: 6mi

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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Clayton, Missouri, USA

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